diff --git a/core/includes/common.inc b/core/includes/common.inc
index 037c5b0..3adbada 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -203,7 +203,7 @@ function valid_email_address($mail) {
  * @return string
  *   A URI stripped of dangerous protocols and encoded for output to an HTML
  *   attribute value. Because it is already encoded, it should not be set as a
- *   value within a $attributes array passed to Drupal\Core\Template\Attribute,
+ *   value within an $attributes array passed to Drupal\Core\Template\Attribute,
  *   because Drupal\Core\Template\Attribute expects those values to be
  *   plain-text strings. To pass a filtered URI to
  *   Drupal\Core\Template\Attribute, call
diff --git a/core/lib/Drupal/Component/Plugin/Exception/PluginNotFoundException.php b/core/lib/Drupal/Component/Plugin/Exception/PluginNotFoundException.php
index fa83e01..3c78fa9 100644
--- a/core/lib/Drupal/Component/Plugin/Exception/PluginNotFoundException.php
+++ b/core/lib/Drupal/Component/Plugin/Exception/PluginNotFoundException.php
@@ -8,7 +8,7 @@
 class PluginNotFoundException extends PluginException {
 
   /**
-   * Construct an PluginNotFoundException exception.
+   * Construct a PluginNotFoundException exception.
    *
    * For the remaining parameters see \Exception.
    *
diff --git a/core/lib/Drupal/Core/Config/ConfigFactoryInterface.php b/core/lib/Drupal/Core/Config/ConfigFactoryInterface.php
index 00aae05..cccffeb 100644
--- a/core/lib/Drupal/Core/Config/ConfigFactoryInterface.php
+++ b/core/lib/Drupal/Core/Config/ConfigFactoryInterface.php
@@ -21,7 +21,7 @@
   public function get($name);
 
   /**
-   * Returns an mutable configuration object for a given name.
+   * Returns a mutable configuration object for a given name.
    *
    * Should not be used for config that will have runtime effects. Therefore it
    * is always loaded override free.
diff --git a/core/lib/Drupal/Core/Database/Database.php b/core/lib/Drupal/Core/Database/Database.php
index 8fe1c45..3174125 100644
--- a/core/lib/Drupal/Core/Database/Database.php
+++ b/core/lib/Drupal/Core/Database/Database.php
@@ -35,8 +35,8 @@
   const RETURN_INSERT_ID = 3;
 
   /**
-   * An nested array of all active connections. It is keyed by database name
-   * and target.
+   * A nested array of all active connections. It is keyed by database name and
+   * target.
    *
    * @var array
    */
diff --git a/core/lib/Drupal/Core/Database/Driver/pgsql/Select.php b/core/lib/Drupal/Core/Database/Driver/pgsql/Select.php
index 3214b33..ac75180 100644
--- a/core/lib/Drupal/Core/Database/Driver/pgsql/Select.php
+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Select.php
@@ -99,9 +99,8 @@ public function orderBy($field, $direction = 'ASC') {
       }
     }
 
-    // If $field contains an characters which are not allowed in a field name
-    // it is considered an expression, these can't be handled automatically
-    // either.
+    // If $field contains a characters which are not allowed in a field name it
+    // is considered an expression, these can't be handled automatically either.
     if ($this->connection->escapeField($field) != $field) {
       return $this;
     }
diff --git a/core/lib/Drupal/Core/Database/database.api.php b/core/lib/Drupal/Core/Database/database.api.php
index 07e4343..6f31ee6 100644
--- a/core/lib/Drupal/Core/Database/database.api.php
+++ b/core/lib/Drupal/Core/Database/database.api.php
@@ -410,7 +410,7 @@ function hook_query_alter(Drupal\Core\Database\Query\AlterableInterface $query)
  * Perform alterations to a structured query for a given tag.
  *
  * @param $query
- *   An Query object describing the composite parts of a SQL query.
+ *   A Query object describing the composite parts of a SQL query.
  *
  * @see hook_query_alter()
  * @see node_query_node_access_alter()
diff --git a/core/lib/Drupal/Core/Entity/Exception/NoCorrespondingEntityClassException.php b/core/lib/Drupal/Core/Entity/Exception/NoCorrespondingEntityClassException.php
index b50caea..4843527 100644
--- a/core/lib/Drupal/Core/Entity/Exception/NoCorrespondingEntityClassException.php
+++ b/core/lib/Drupal/Core/Entity/Exception/NoCorrespondingEntityClassException.php
@@ -12,7 +12,7 @@
 class NoCorrespondingEntityClassException extends \Exception {
 
   /**
-   * Constructs an NoCorrespondingEntityClassException.
+   * Constructs a NoCorrespondingEntityClassException.
    *
    * @param string $class
    *   The class which does not correspond to an entity type.
diff --git a/core/lib/Drupal/Core/Extension/ThemeHandlerInterface.php b/core/lib/Drupal/Core/Extension/ThemeHandlerInterface.php
index 91778e3..7bff9bd 100644
--- a/core/lib/Drupal/Core/Extension/ThemeHandlerInterface.php
+++ b/core/lib/Drupal/Core/Extension/ThemeHandlerInterface.php
@@ -40,7 +40,7 @@ public function install(array $theme_list, $install_dependencies = TRUE);
    *   The themes to uninstall.
    *
    * @throws \InvalidArgumentException
-   *   Thrown when you uninstall an not installed theme.
+   *   Thrown when you uninstall a not installed theme.
    *
    * @see hook_themes_uninstalled()
    *
diff --git a/core/lib/Drupal/Core/Extension/ThemeInstallerInterface.php b/core/lib/Drupal/Core/Extension/ThemeInstallerInterface.php
index ad80762..746c329 100644
--- a/core/lib/Drupal/Core/Extension/ThemeInstallerInterface.php
+++ b/core/lib/Drupal/Core/Extension/ThemeInstallerInterface.php
@@ -35,7 +35,7 @@ public function install(array $theme_list, $install_dependencies = TRUE);
    *   The themes to uninstall.
    *
    * @throws \InvalidArgumentException
-   *   Thrown when you uninstall an not installed theme.
+   *   Thrown when you uninstall a not installed theme.
    *
    * @see hook_themes_uninstalled()
    */
diff --git a/core/lib/Drupal/Core/Form/ConfirmFormBase.php b/core/lib/Drupal/Core/Form/ConfirmFormBase.php
index 6de9fdf..7fb3cec 100644
--- a/core/lib/Drupal/Core/Form/ConfirmFormBase.php
+++ b/core/lib/Drupal/Core/Form/ConfirmFormBase.php
@@ -3,7 +3,7 @@
 namespace Drupal\Core\Form;
 
 /**
- * Provides an generic base class for a confirmation form.
+ * Provides a generic base class for a confirmation form.
  */
 abstract class ConfirmFormBase extends FormBase implements ConfirmFormInterface {
 
diff --git a/core/lib/Drupal/Core/Queue/QueueWorkerManager.php b/core/lib/Drupal/Core/Queue/QueueWorkerManager.php
index d9a47b8..b1aa40f 100644
--- a/core/lib/Drupal/Core/Queue/QueueWorkerManager.php
+++ b/core/lib/Drupal/Core/Queue/QueueWorkerManager.php
@@ -17,7 +17,7 @@
 class QueueWorkerManager extends DefaultPluginManager implements QueueWorkerManagerInterface {
 
   /**
-   * Constructs an QueueWorkerManager object.
+   * Constructs a QueueWorkerManager object.
    *
    * @param \Traversable $namespaces
    *   An object that implements \Traversable which contains the root paths
diff --git a/core/lib/Drupal/Core/TypedData/Plugin/DataType/BinaryData.php b/core/lib/Drupal/Core/TypedData/Plugin/DataType/BinaryData.php
index e51e505..b7a719e 100644
--- a/core/lib/Drupal/Core/TypedData/Plugin/DataType/BinaryData.php
+++ b/core/lib/Drupal/Core/TypedData/Plugin/DataType/BinaryData.php
@@ -10,7 +10,7 @@
  *
  * The plain value of binary data is a PHP file resource, see
  * http://php.net/manual/language.types.resource.php. For setting the value
- * a PHP file resource or a (absolute) stream resource URI may be passed.
+ * a PHP file resource or an (absolute) stream resource URI may be passed.
  *
  * @DataType(
  *   id = "binary",
@@ -48,7 +48,7 @@ public function getValue() {
   /**
    * Overrides TypedData::setValue().
    *
-   * Supports a PHP file resource or a (absolute) stream resource URI as value.
+   * Supports a PHP file resource or an (absolute) stream resource URI as value.
    */
   public function setValue($value, $notify = TRUE) {
     if (!isset($value)) {
diff --git a/core/lib/Drupal/Core/TypedData/Type/BinaryInterface.php b/core/lib/Drupal/Core/TypedData/Type/BinaryInterface.php
index b8bdd3a..80f13c1 100644
--- a/core/lib/Drupal/Core/TypedData/Type/BinaryInterface.php
+++ b/core/lib/Drupal/Core/TypedData/Type/BinaryInterface.php
@@ -9,7 +9,7 @@
  *
  * The plain value of binary data is a PHP file resource, see
  * http://php.net/manual/language.types.resource.php. For setting the value
- * a PHP file resource or a (absolute) stream resource URI may be passed.
+ * a PHP file resource or an (absolute) stream resource URI may be passed.
  *
  * @ingroup typed_data
  */
diff --git a/core/lib/Drupal/Core/TypedData/TypedDataManagerInterface.php b/core/lib/Drupal/Core/TypedData/TypedDataManagerInterface.php
index 20a4a76..960294e 100644
--- a/core/lib/Drupal/Core/TypedData/TypedDataManagerInterface.php
+++ b/core/lib/Drupal/Core/TypedData/TypedDataManagerInterface.php
@@ -146,7 +146,7 @@ public function getInstance(array $options);
    *   The parent typed data object, implementing the TypedDataInterface and
    *   either the ListInterface or the ComplexDataInterface.
    * @param string $property_name
-   *   The name of the property to instantiate, or the delta of an list item.
+   *   The name of the property to instantiate, or the delta of a list item.
    * @param mixed $value
    *   (optional) The data value. If set, it has to match one of the supported
    *   data type formats as documented by the data type classes.
diff --git a/core/lib/Drupal/Core/Url.php b/core/lib/Drupal/Core/Url.php
index 2ea7b76..61aea85 100644
--- a/core/lib/Drupal/Core/Url.php
+++ b/core/lib/Drupal/Core/Url.php
@@ -383,7 +383,7 @@ protected static function fromEntityUri(array $uri_parts, array $options, $uri)
    *   An array of options, see \Drupal\Core\Url::fromUri() for details.
    *
    * @return \Drupal\Core\Url
-   *   A new Url object for a 'internal:' URI.
+   *   A new Url object for an 'internal:' URI.
    *
    * @throws \InvalidArgumentException
    *   Thrown when the URI's path component doesn't have a leading slash.
diff --git a/core/misc/autocomplete.js b/core/misc/autocomplete.js
index 5a1c156..1359751 100644
--- a/core/misc/autocomplete.js
+++ b/core/misc/autocomplete.js
@@ -50,7 +50,7 @@
   }
 
   /**
-   * Returns the last value of an multi-value textfield.
+   * Returns the last value of a multi-value textfield.
    *
    * @function Drupal.autocomplete.extractLastTerm
    *
diff --git a/core/misc/date.js b/core/misc/date.js
index 8b6b71c..037ff12 100644
--- a/core/misc/date.js
+++ b/core/misc/date.js
@@ -15,7 +15,7 @@
    * @prop {Drupal~behaviorAttach} attach
    *   Attaches the behavior. Accepts in `settings.date` an object listing
    *   elements to process, keyed by the HTML ID of the form element containing
-   *   the human-readable value. Each element is an datepicker settings object.
+   *   the human-readable value. Each element is a datepicker settings object.
    * @prop {Drupal~behaviorDetach} detach
    *   Detach the behavior destroying datepickers on effected elements.
    */
diff --git a/core/misc/dialog/dialog.ajax.js b/core/misc/dialog/dialog.ajax.js
index 3f1b0c2..b74f1ed 100644
--- a/core/misc/dialog/dialog.ajax.js
+++ b/core/misc/dialog/dialog.ajax.js
@@ -55,7 +55,7 @@
      * Scan a dialog for any primary buttons and move them to the button area.
      *
      * @param {jQuery} $dialog
-     *   An jQuery object containing the element that is the dialog target.
+     *   A jQuery object containing the element that is the dialog target.
      *
      * @return {Array}
      *   An array of buttons that need to be added to the button area.
diff --git a/core/modules/comment/src/Form/ConfirmDeleteMultiple.php b/core/modules/comment/src/Form/ConfirmDeleteMultiple.php
index 662cfa4..63fedc4 100644
--- a/core/modules/comment/src/Form/ConfirmDeleteMultiple.php
+++ b/core/modules/comment/src/Form/ConfirmDeleteMultiple.php
@@ -29,7 +29,7 @@ class ConfirmDeleteMultiple extends ConfirmFormBase {
   protected $comments;
 
   /**
-   * Creates an new ConfirmDeleteMultiple form.
+   * Creates a new ConfirmDeleteMultiple form.
    *
    * @param \Drupal\comment\CommentStorageInterface $comment_storage
    *   The comment storage.
diff --git a/core/modules/comment/src/Plugin/migrate/destination/EntityComment.php b/core/modules/comment/src/Plugin/migrate/destination/EntityComment.php
index a3e82af..c26bf9e 100644
--- a/core/modules/comment/src/Plugin/migrate/destination/EntityComment.php
+++ b/core/modules/comment/src/Plugin/migrate/destination/EntityComment.php
@@ -33,7 +33,7 @@ class EntityComment extends EntityContentBase {
   protected $stubCommentedEntityIds;
 
   /**
-   * Builds an comment entity destination.
+   * Builds a comment entity destination.
    *
    * @param array $configuration
    *   A configuration array containing information about the plugin instance.
diff --git a/core/modules/content_moderation/src/Plugin/Derivative/DynamicLocalTasks.php b/core/modules/content_moderation/src/Plugin/Derivative/DynamicLocalTasks.php
index 7ff1fa5..c9c934c 100644
--- a/core/modules/content_moderation/src/Plugin/Derivative/DynamicLocalTasks.php
+++ b/core/modules/content_moderation/src/Plugin/Derivative/DynamicLocalTasks.php
@@ -40,7 +40,7 @@ class DynamicLocalTasks extends DeriverBase implements ContainerDeriverInterface
   protected $moderationInfo;
 
   /**
-   * Creates an FieldUiLocalTask object.
+   * Creates a FieldUiLocalTask object.
    *
    * @param string $base_plugin_id
    *   The base plugin ID.
diff --git a/core/modules/dblog/src/Tests/ConnectionFailureTest.php b/core/modules/dblog/src/Tests/ConnectionFailureTest.php
index d800224..3192d90 100644
--- a/core/modules/dblog/src/Tests/ConnectionFailureTest.php
+++ b/core/modules/dblog/src/Tests/ConnectionFailureTest.php
@@ -23,7 +23,7 @@ function testConnectionFailureLogging() {
     // MySQL errors like "1153 - Got a packet bigger than 'max_allowed_packet'
     // bytes" or "1100 - Table 'xyz' was not locked with LOCK TABLES" lead to a
     // database connection unusable for further requests. All further request
-    // will result in an "2006 - MySQL server had gone away" error. As a
+    // will result in a "2006 - MySQL server had gone away" error. As a
     // consequence it's impossible to use this connection to log the causing
     // initial error itself. Using Database::closeConnection() we simulate such
     // a corrupted connection. In this case dblog has to establish a different
diff --git a/core/modules/editor/src/Tests/EditorLoadingTest.php b/core/modules/editor/src/Tests/EditorLoadingTest.php
index 88055e9..1d5bf7b 100644
--- a/core/modules/editor/src/Tests/EditorLoadingTest.php
+++ b/core/modules/editor/src/Tests/EditorLoadingTest.php
@@ -230,7 +230,7 @@ public function testSupportedElementTypes() {
     ]);
     $editor->save();
 
-    // Create an "page" node that uses the full_html text format.
+    // Create a "page" node that uses the full_html text format.
     $this->drupalCreateNode(array(
       'type' => 'page',
       'field_text' => array(
diff --git a/core/modules/field/src/Tests/EntityReference/EntityReferenceIntegrationTest.php b/core/modules/field/src/Tests/EntityReference/EntityReferenceIntegrationTest.php
index 4c099fe..4ac949a 100644
--- a/core/modules/field/src/Tests/EntityReference/EntityReferenceIntegrationTest.php
+++ b/core/modules/field/src/Tests/EntityReference/EntityReferenceIntegrationTest.php
@@ -74,7 +74,7 @@ public function testSupportedEntityTypesAndWidgets() {
       $edit = array(
         'name[0][value]' => $entity_name,
         $this->fieldName . '[0][target_id]' => $referenced_entities[0]->label() . ' (' . $referenced_entities[0]->id() . ')',
-        // Test an input of the entity label without a ' (entity_id)' suffix.
+        // Test an input of the entity label without an ' (entity_id)' suffix.
         $this->fieldName . '[1][target_id]' => $referenced_entities[1]->label(),
       );
       $this->drupalPostForm($this->entityType . '/add', $edit, t('Save'));
@@ -99,7 +99,7 @@ public function testSupportedEntityTypesAndWidgets() {
 
       $entity_name = $this->randomMachineName();
       $target_id = $referenced_entities[0]->label() . ' (' . $referenced_entities[0]->id() . ')';
-      // Test an input of the entity label without a ' (entity_id)' suffix.
+      // Test an input of the entity label without an ' (entity_id)' suffix.
       $target_id .= ', ' . $referenced_entities[1]->label();
       $edit = array(
         'name[0][value]' => $entity_name,
diff --git a/core/modules/field_ui/src/Plugin/Derivative/FieldUiLocalTask.php b/core/modules/field_ui/src/Plugin/Derivative/FieldUiLocalTask.php
index 3ebf959..58d7efd 100644
--- a/core/modules/field_ui/src/Plugin/Derivative/FieldUiLocalTask.php
+++ b/core/modules/field_ui/src/Plugin/Derivative/FieldUiLocalTask.php
@@ -31,7 +31,7 @@ class FieldUiLocalTask extends DeriverBase implements ContainerDeriverInterface
   protected $entityManager;
 
   /**
-   * Creates an FieldUiLocalTask object.
+   * Creates a FieldUiLocalTask object.
    *
    * @param \Drupal\Core\Routing\RouteProviderInterface $route_provider
    *   The route provider.
diff --git a/core/modules/filter/src/Annotation/Filter.php b/core/modules/filter/src/Annotation/Filter.php
index 9d7d1cc..f2a768e 100644
--- a/core/modules/filter/src/Annotation/Filter.php
+++ b/core/modules/filter/src/Annotation/Filter.php
@@ -5,7 +5,7 @@
 use Drupal\Component\Annotation\Plugin;
 
 /**
- * Defines an filter annotation object.
+ * Defines a filter annotation object.
  *
  * Plugin Namespace: Plugin\Filter
  *
diff --git a/core/modules/filter/src/Entity/FilterFormat.php b/core/modules/filter/src/Entity/FilterFormat.php
index 8ae4d60..34f860b 100644
--- a/core/modules/filter/src/Entity/FilterFormat.php
+++ b/core/modules/filter/src/Entity/FilterFormat.php
@@ -368,10 +368,10 @@ public function getHtmlRestrictions() {
         }
       }, NULL);
 
-      // Simplification: if we have both a (intersected) whitelist and a (unioned)
-      // blacklist, then remove any tags from the whitelist that also exist in the
-      // blacklist. Now the whitelist alone expresses all tag-level restrictions,
-      // and we can delete the blacklist.
+      // Simplification: if we have both an (intersected) whitelist and a
+      // (unioned) blacklist, then remove any tags from the whitelist that also
+      // exist in the blacklist. Now the whitelist alone expresses all tag-level
+      // restrictions, and we can delete the blacklist.
       if (isset($restrictions['allowed']) && isset($restrictions['forbidden_tags'])) {
         foreach ($restrictions['forbidden_tags'] as $tag) {
           if (isset($restrictions['allowed'][$tag])) {
diff --git a/core/modules/filter/src/Tests/FilterFormTest.php b/core/modules/filter/src/Tests/FilterFormTest.php
index 24bbc15..26c922e 100644
--- a/core/modules/filter/src/Tests/FilterFormTest.php
+++ b/core/modules/filter/src/Tests/FilterFormTest.php
@@ -28,7 +28,7 @@ class FilterFormTest extends WebTestBase {
   protected $adminUser;
 
   /**
-   * An basic user account that can only access basic HTML text format.
+   * A basic user account that can only access basic HTML text format.
    *
    * @var \Drupal\user\Entity\User
    */
diff --git a/core/modules/hal/src/Normalizer/ContentEntityNormalizer.php b/core/modules/hal/src/Normalizer/ContentEntityNormalizer.php
index 88eb36c..0bd9f49 100644
--- a/core/modules/hal/src/Normalizer/ContentEntityNormalizer.php
+++ b/core/modules/hal/src/Normalizer/ContentEntityNormalizer.php
@@ -39,7 +39,7 @@ class ContentEntityNormalizer extends NormalizerBase {
   protected $moduleHandler;
 
   /**
-   * Constructs an ContentEntityNormalizer object.
+   * Constructs a ContentEntityNormalizer object.
    *
    * @param \Drupal\serialization\LinkManager\LinkManagerInterface $link_manager
    *   The hypermedia link manager.
diff --git a/core/modules/help/tests/src/Functional/HelpTest.php b/core/modules/help/tests/src/Functional/HelpTest.php
index 2e82499..a5dfcdd 100644
--- a/core/modules/help/tests/src/Functional/HelpTest.php
+++ b/core/modules/help/tests/src/Functional/HelpTest.php
@@ -77,7 +77,7 @@ public function testHelp() {
       $this->assertLink($name, 0, format_string('Link properly added to @name (admin/help/@module)', array('@module' => $module, '@name' => $name)));
     }
 
-    // Ensure that module which does not provide an module overview page is
+    // Ensure that module which does not provide a module overview page is
     // handled correctly.
     $this->clickLink(\Drupal::moduleHandler()->getName('help_test'));
     $this->assertRaw(t('No help is available for module %module.', array('%module' => \Drupal::moduleHandler()->getName('help_test'))));
diff --git a/core/modules/image/src/Plugin/Field/FieldType/ImageItem.php b/core/modules/image/src/Plugin/Field/FieldType/ImageItem.php
index c83e143..256687f 100644
--- a/core/modules/image/src/Plugin/Field/FieldType/ImageItem.php
+++ b/core/modules/image/src/Plugin/Field/FieldType/ImageItem.php
@@ -452,7 +452,7 @@ protected function defaultImageForm(array &$element, array $settings) {
    * Validates the managed_file element for the default Image form.
    *
    * This function ensures the fid is a scalar value and not an array. It is
-   * assigned as a #element_validate callback in
+   * assigned as an #element_validate callback in
    * \Drupal\image\Plugin\Field\FieldType\ImageItem::defaultImageForm().
    *
    * @param array $element
diff --git a/core/modules/image/src/Tests/ImageFieldDefaultImagesTest.php b/core/modules/image/src/Tests/ImageFieldDefaultImagesTest.php
index a0f0274..5cf16dc 100644
--- a/core/modules/image/src/Tests/ImageFieldDefaultImagesTest.php
+++ b/core/modules/image/src/Tests/ImageFieldDefaultImagesTest.php
@@ -43,7 +43,7 @@ public function testDefaultImages() {
       $default_images[$image_target] = $file;
     }
 
-    // Create an image field and add an field to the article content type.
+    // Create an image field and add a field to the article content type.
     $field_name = strtolower($this->randomMachineName());
     $storage_settings['default_image'] = array(
       'uuid' => $default_images['field']->uuid(),
diff --git a/core/modules/language/src/Plugin/Block/LanguageBlock.php b/core/modules/language/src/Plugin/Block/LanguageBlock.php
index 5c58ac0..25800fa 100644
--- a/core/modules/language/src/Plugin/Block/LanguageBlock.php
+++ b/core/modules/language/src/Plugin/Block/LanguageBlock.php
@@ -38,7 +38,7 @@ class LanguageBlock extends BlockBase implements ContainerFactoryPluginInterface
   protected $pathMatcher;
 
   /**
-   * Constructs an LanguageBlock object.
+   * Constructs a LanguageBlock object.
    *
    * @param array $configuration
    *   A configuration array containing information about the plugin instance.
diff --git a/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationContentEntity.php b/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationContentEntity.php
index 9218899..18a5d7c 100644
--- a/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationContentEntity.php
+++ b/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationContentEntity.php
@@ -201,7 +201,7 @@ protected function hasLowerLanguageNegotiationWeight() {
   /**
    * Determines if content entity route condition is met.
    *
-   * Requirements: currently being on an content entity route and processing
+   * Requirements: currently being on a content entity route and processing
    * outbound url pointing to the same content entity.
    *
    * @param \Symfony\Component\Routing\Route $outbound_route
diff --git a/core/modules/language/tests/src/Kernel/EntityUrlLanguageTest.php b/core/modules/language/tests/src/Kernel/EntityUrlLanguageTest.php
index fb62f48..45694fa 100644
--- a/core/modules/language/tests/src/Kernel/EntityUrlLanguageTest.php
+++ b/core/modules/language/tests/src/Kernel/EntityUrlLanguageTest.php
@@ -78,7 +78,7 @@ public function testEntityUrlLanguageWithLanguageContentEnabled() {
     ]);
     $config->save();
 
-    // Without being on an content entity route the default entity URL tests
+    // Without being on a content entity route the default entity URL tests
     // should still pass.
     $this->testEntityUrlLanguage();
 
diff --git a/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php b/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
index 9af176c..37eae86 100644
--- a/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
+++ b/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
@@ -133,7 +133,7 @@ public static function validateUriElement($element, FormStateInterface $form_sta
     $uri = static::getUserEnteredStringAsUri($element['#value']);
     $form_state->setValueForElement($element, $uri);
 
-    // If getUserEnteredStringAsUri() mapped the entered value to a 'internal:'
+    // If getUserEnteredStringAsUri() mapped the entered value to an 'internal:'
     // URI , ensure the raw value begins with '/', '?' or '#'.
     // @todo '<front>' is valid input for BC reasons, may be removed by
     //   https://www.drupal.org/node/2421941
diff --git a/core/modules/locale/locale.module b/core/modules/locale/locale.module
index 5b59faa..fbea169 100644
--- a/core/modules/locale/locale.module
+++ b/core/modules/locale/locale.module
@@ -1015,7 +1015,7 @@ function locale_translation_use_remote_source() {
  * not have any false positives. But it is only a test, not a transformation,
  * as it destroys valid HTML. We cannot reliably filter translation strings
  * on import because some strings are irreversibly corrupted. For example,
- * a &amp; in the translation would get encoded to &amp;amp; by
+ * an &amp; in the translation would get encoded to &amp;amp; by
  * \Drupal\Component\Utility\Xss::filter() before being put in the database,
  * and thus would be displayed incorrectly.
  *
diff --git a/core/modules/menu_link_content/src/Entity/MenuLinkContent.php b/core/modules/menu_link_content/src/Entity/MenuLinkContent.php
index d23f876..0fa76cc 100644
--- a/core/modules/menu_link_content/src/Entity/MenuLinkContent.php
+++ b/core/modules/menu_link_content/src/Entity/MenuLinkContent.php
@@ -195,7 +195,7 @@ public function postSave(EntityStorageInterface $storage, $update = TRUE) {
     /** @var \Drupal\Core\Menu\MenuLinkManagerInterface $menu_link_manager */
     $menu_link_manager = \Drupal::service('plugin.manager.menu.link');
 
-    // The menu link can just be updated if there is already an menu link entry
+    // The menu link can just be updated if there is already a menu link entry
     // on both entity and menu link plugin level.
     $definition = $this->getPluginDefinition();
     // Even when $update is FALSE, for top level links it is possible the link
diff --git a/core/modules/node/src/Controller/NodeViewController.php b/core/modules/node/src/Controller/NodeViewController.php
index fce50e1..b3ee4e7 100644
--- a/core/modules/node/src/Controller/NodeViewController.php
+++ b/core/modules/node/src/Controller/NodeViewController.php
@@ -22,7 +22,7 @@ class NodeViewController extends EntityViewController {
   protected $currentUser;
 
   /**
-   * Creates an NodeViewController object.
+   * Creates a NodeViewController object.
    *
    * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
    *   The entity manager.
diff --git a/core/modules/simpletest/src/Exception/MissingGroupException.php b/core/modules/simpletest/src/Exception/MissingGroupException.php
index 85a0696..05ecb36 100644
--- a/core/modules/simpletest/src/Exception/MissingGroupException.php
+++ b/core/modules/simpletest/src/Exception/MissingGroupException.php
@@ -3,7 +3,7 @@
 namespace Drupal\simpletest\Exception;
 
 /**
- * Exception thrown when a simpletest class is missing an @group annotation.
+ * Exception thrown when a simpletest class is missing a @group annotation.
  */
 class MissingGroupException extends \LogicException {
 }
diff --git a/core/modules/simpletest/src/WebTestBase.php b/core/modules/simpletest/src/WebTestBase.php
index bce0522..e9cbca2 100644
--- a/core/modules/simpletest/src/WebTestBase.php
+++ b/core/modules/simpletest/src/WebTestBase.php
@@ -1453,7 +1453,7 @@ protected function drupalProcessAjaxResponse($content, array $ajax_response, arr
    *   The value for the "Accept" header. Usually either 'application/json' or
    *   'application/vnd.drupal-ajax'.
    * @param array $post
-   *   The POST data. When making a 'application/vnd.drupal-ajax' request, the
+   *   The POST data. When making an 'application/vnd.drupal-ajax' request, the
    *   Ajax page state data should be included. Use getAjaxPageStatePostData()
    *   for that.
    * @param array $options
@@ -1486,7 +1486,7 @@ protected function drupalPost($path, $accept, array $post, $options = array()) {
    * @param string $format
    *   The request format.
    * @param array $post
-   *   The POST data. When making a 'application/vnd.drupal-ajax' request, the
+   *   The POST data. When making an 'application/vnd.drupal-ajax' request, the
    *   Ajax page state data should be included. Use getAjaxPageStatePostData()
    *   for that.
    * @param array $options
diff --git a/core/modules/system/src/Form/DateFormatDeleteForm.php b/core/modules/system/src/Form/DateFormatDeleteForm.php
index a8e1c04..937fd8a 100644
--- a/core/modules/system/src/Form/DateFormatDeleteForm.php
+++ b/core/modules/system/src/Form/DateFormatDeleteForm.php
@@ -19,7 +19,7 @@ class DateFormatDeleteForm extends EntityDeleteForm {
   protected $dateFormatter;
 
   /**
-   * Constructs an DateFormatDeleteForm object.
+   * Constructs a DateFormatDeleteForm object.
    *
    * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
    *   The date formatter service.
diff --git a/core/modules/system/src/Tests/ParamConverter/UpcastingTest.php b/core/modules/system/src/Tests/ParamConverter/UpcastingTest.php
index b881386..12ce5b3 100644
--- a/core/modules/system/src/Tests/ParamConverter/UpcastingTest.php
+++ b/core/modules/system/src/Tests/ParamConverter/UpcastingTest.php
@@ -21,7 +21,7 @@ class UpcastingTest extends WebTestBase {
    * signature: f($user, $node, $foo) returning either values or labels
    * like "user: Dries, node: First post, foo: bar"
    *
-   * The tests shuffle the parameters around an checks if the right thing is
+   * The tests shuffle the parameters around a checks if the right thing is
    * happening.
    */
   public function testUpcasting() {
diff --git a/core/modules/system/src/Tests/System/HtaccessTest.php b/core/modules/system/src/Tests/System/HtaccessTest.php
index ad6e09e..3b885cf 100644
--- a/core/modules/system/src/Tests/System/HtaccessTest.php
+++ b/core/modules/system/src/Tests/System/HtaccessTest.php
@@ -104,7 +104,7 @@ public function testFileAccess() {
     // Test that it is possible to have path aliases containing .php.
     $type = $this->drupalCreateContentType();
 
-    // Create an node aliased to test.php.
+    // Create a node aliased to test.php.
     $node = $this->drupalCreateNode([
       'title' => 'This is a node',
       'type' => $type->id(),
diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index d022f6a..58b3a58 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -1216,11 +1216,11 @@ function system_update_8003() {
 }
 
 /**
- * Add a (id, default_langcode, langcode) composite index to entities.
+ * Add an (id, default_langcode, langcode) composite index to entities.
  */
 function system_update_8004() {
   // \Drupal\Core\Entity\Sql\SqlContentEntityStorageSchema was changed in
-  // https://www.drupal.org/node/2261669 to include a (id, default_langcode,
+  // https://www.drupal.org/node/2261669 to include an (id, default_langcode,
   // langcode) compound index, but this update function wasn't added until
   // https://www.drupal.org/node/2542748. Regenerate the related schemas to
   // ensure they match the currently expected status.
diff --git a/core/modules/system/templates/admin-page.html.twig b/core/modules/system/templates/admin-page.html.twig
index a2483f1..0faa529 100644
--- a/core/modules/system/templates/admin-page.html.twig
+++ b/core/modules/system/templates/admin-page.html.twig
@@ -5,7 +5,7 @@
  *
  * Available variables:
  * - system_compact_link: Themed link to toggle compact view.
- * - containers: An list of administrative blocks keyed by position: left or
+ * - containers: A list of administrative blocks keyed by position: left or
  *   right. Contains:
  *   - blocks: A list of blocks within a container.
  *
diff --git a/core/modules/toolbar/src/Tests/ToolbarAdminMenuTest.php b/core/modules/toolbar/src/Tests/ToolbarAdminMenuTest.php
index 56b9d69..3722018 100644
--- a/core/modules/toolbar/src/Tests/ToolbarAdminMenuTest.php
+++ b/core/modules/toolbar/src/Tests/ToolbarAdminMenuTest.php
@@ -125,7 +125,7 @@ function testModuleStatusChangeSubtreesHashCacheClear() {
    * Tests toolbar cache tags implementation.
    */
   function testMenuLinkUpdateSubtreesHashCacheClear() {
-    // The ID of a (any) admin menu link.
+    // The ID of an (any) admin menu link.
     $admin_menu_link_id = 'system.admin_config_development';
 
     // Disable the link.
diff --git a/core/modules/tour/js/tour.js b/core/modules/tour/js/tour.js
index 2c7050f..7da8f37 100644
--- a/core/modules/tour/js/tour.js
+++ b/core/modules/tour/js/tour.js
@@ -184,7 +184,7 @@
      * Gets the tour.
      *
      * @return {jQuery}
-     *   A jQuery element pointing to a `<ol>` containing tour items.
+     *   A jQuery element pointing to an `<ol>` containing tour items.
      */
     _getTour: function () {
       return this.model.get('tour');
@@ -212,7 +212,7 @@
      * http://example.com/foo?tips=bar
      *
      * @param {jQuery} $tour
-     *   A jQuery element pointing to a `<ol>` containing tour items.
+     *   A jQuery element pointing to an `<ol>` containing tour items.
      * @param {jQuery} $document
      *   A jQuery element pointing to the document within which the elements
      *   should be sought.
diff --git a/core/modules/update/src/Tests/UpdateCoreTest.php b/core/modules/update/src/Tests/UpdateCoreTest.php
index 6aebf23..8d18e49 100644
--- a/core/modules/update/src/Tests/UpdateCoreTest.php
+++ b/core/modules/update/src/Tests/UpdateCoreTest.php
@@ -281,7 +281,7 @@ function testModulePageSecurityUpdate() {
     // Make sure duplicate messages don't appear on Update status pages.
     $this->drupalGet('admin/reports/status');
     // We're expecting "There is a security update..." inside the status report
-    // itself, but the drupal_set_message() appears as an li so we can prefix
+    // itself, but the drupal_set_message() appears as a li so we can prefix
     // with that and search for the raw HTML.
     $this->assertNoRaw('<li>' . t('There is a security update available for your version of Drupal.'));
 
diff --git a/core/modules/views/src/ManyToOneHelper.php b/core/modules/views/src/ManyToOneHelper.php
index a3c4834..d91c79f 100644
--- a/core/modules/views/src/ManyToOneHelper.php
+++ b/core/modules/views/src/ManyToOneHelper.php
@@ -269,7 +269,7 @@ public function addFilter() {
     }
 
     // add_condition determines whether a single expression is enough(FALSE) or the
-    // conditions should be added via an db_or()/db_and() (TRUE).
+    // conditions should be added via a db_or()/db_and() (TRUE).
     $add_condition = TRUE;
     if ($operator == 'not') {
       $value = NULL;
diff --git a/core/modules/views/src/Plugin/views/argument_validator/Entity.php b/core/modules/views/src/Plugin/views/argument_validator/Entity.php
index 5294731..3cd8c47 100644
--- a/core/modules/views/src/Plugin/views/argument_validator/Entity.php
+++ b/core/modules/views/src/Plugin/views/argument_validator/Entity.php
@@ -35,7 +35,7 @@ class Entity extends ArgumentValidatorPluginBase {
   protected $multipleCapable = TRUE;
 
   /**
-   * Constructs an \Drupal\views\Plugin\views\argument_validator\Entity object.
+   * Constructs a \Drupal\views\Plugin\views\argument_validator\Entity object.
    *
    * @param array $configuration
    *   A configuration array containing information about the plugin instance.
diff --git a/core/modules/views/src/Plugin/views/display/EntityReference.php b/core/modules/views/src/Plugin/views/display/EntityReference.php
index bf2d460..68494d6 100644
--- a/core/modules/views/src/Plugin/views/display/EntityReference.php
+++ b/core/modules/views/src/Plugin/views/display/EntityReference.php
@@ -6,7 +6,7 @@
  * The plugin that handles an EntityReference display.
  *
  * "entity_reference_display" is a custom property, used with
- * \Drupal\views\Views::getApplicableViews() to retrieve all views with a
+ * \Drupal\views\Views::getApplicableViews() to retrieve all views with an
  * 'Entity Reference' display.
  *
  * @ingroup views_display_plugins
diff --git a/core/modules/views/tests/src/Unit/ViewsDataTest.php b/core/modules/views/tests/src/Unit/ViewsDataTest.php
index 2351892..ee12007 100644
--- a/core/modules/views/tests/src/Unit/ViewsDataTest.php
+++ b/core/modules/views/tests/src/Unit/ViewsDataTest.php
@@ -481,7 +481,7 @@ public function testCacheCallsWithWarmCacheAndDifferentTable() {
   }
 
   /**
-   * Tests the cache calls for an not existing table:
+   * Tests the cache calls for a not existing table:
    *
    * Warm cache:
    *   - all tables
@@ -519,7 +519,7 @@ public function testCacheCallsWithWarmCacheAndInvalidTable() {
   }
 
   /**
-   * Tests the cache calls for an not existing table:
+   * Tests the cache calls for a not existing table:
    *
    * Warm cache:
    *   - all tables
diff --git a/core/modules/views_ui/src/Form/Ajax/ViewsFormInterface.php b/core/modules/views_ui/src/Form/Ajax/ViewsFormInterface.php
index c19c73c..44b2087 100644
--- a/core/modules/views_ui/src/Form/Ajax/ViewsFormInterface.php
+++ b/core/modules/views_ui/src/Form/Ajax/ViewsFormInterface.php
@@ -44,7 +44,7 @@ public function getFormState(ViewEntityInterface $view, $display_id, $js);
    *   be 'nojs'. This determines the response.
    *
    * @return array
-   *   An form for a specific operation in the Views UI, or an array of AJAX
+   *   A form for a specific operation in the Views UI, or an array of AJAX
    *   commands to render a form.
    *
    * @todo When https://www.drupal.org/node/1843224 is in, this will return
diff --git a/core/modules/views_ui/src/ViewEditForm.php b/core/modules/views_ui/src/ViewEditForm.php
index 6e81939..02f0240 100644
--- a/core/modules/views_ui/src/ViewEditForm.php
+++ b/core/modules/views_ui/src/ViewEditForm.php
@@ -758,7 +758,7 @@ public function renderDisplayTop(ViewUI $view) {
         '#submit' => array('::submitDisplayAdd', '::submitDelayDestination'),
         '#attributes' => array('class' => array('add-display')),
         // Allow JavaScript to remove the 'Add ' prefix from the button label when
-        // placing the button in a "Add" dropdown menu.
+        // placing the button in an "Add" dropdown menu.
         '#process' => array_merge(array('views_ui_form_button_was_clicked'), $this->elementInfo->getInfoProperty('submit', '#process', array())),
         '#values' => array($this->t('Add @display', array('@display' => $label)), $label),
       );
diff --git a/core/tests/Drupal/KernelTests/Core/Http/LinkRelationsTest.php b/core/tests/Drupal/KernelTests/Core/Http/LinkRelationsTest.php
index d01537b..0a9852d 100644
--- a/core/tests/Drupal/KernelTests/Core/Http/LinkRelationsTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Http/LinkRelationsTest.php
@@ -19,7 +19,7 @@ public function testAvailableLinkRelationships() {
     /** @var \Drupal\Core\Http\LinkRelationTypeManager $link_relation_type_manager */
     $link_relation_type_manager = $this->container->get('plugin.manager.link_relation_type');
 
-    // An link relation type of the "registered" kind.
+    // A link relation type of the "registered" kind.
     /** @var \Drupal\Core\Http\LinkRelationTypeInterface $canonical */
     $canonical = $link_relation_type_manager->createInstance('canonical');
     $this->assertInstanceOf(LinkRelationType::class, $canonical);
@@ -31,7 +31,7 @@ public function testAvailableLinkRelationships() {
     $this->assertEquals('Designates the preferred version of a resource (the IRI and its contents).', $canonical->getDescription());
     $this->assertEquals('', $canonical->getNotes());
 
-    // An link relation type of the "extension" kind.
+    // A link relation type of the "extension" kind.
     /** @var \Drupal\Core\Http\LinkRelationTypeInterface $canonical */
     $add_form = $link_relation_type_manager->createInstance('add-form');
     $this->assertInstanceOf(LinkRelationType::class, $add_form);
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityResolverManagerTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityResolverManagerTest.php
index 6e16470..5a65042 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityResolverManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityResolverManagerTest.php
@@ -266,7 +266,7 @@ public function testSetRouteOptionsWithEntityUpcastingNoCreate() {
   }
 
   /**
-   * Tests setRouteOptions() with an form parameter without interface.
+   * Tests setRouteOptions() with a form parameter without interface.
    *
    * @covers ::setRouteOptions
    * @covers ::getControllerClass
diff --git a/core/tests/Drupal/Tests/Core/Entity/Sql/DefaultTableMappingTest.php b/core/tests/Drupal/Tests/Core/Entity/Sql/DefaultTableMappingTest.php
index 8ce420b..1686cd8 100644
--- a/core/tests/Drupal/Tests/Core/Entity/Sql/DefaultTableMappingTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/Sql/DefaultTableMappingTest.php
@@ -317,7 +317,7 @@ public function testGetFieldColumnNameInvalid($base_field, $columns, $column) {
    * Provides test data for testGetFieldColumnName().
    *
    * @return array[]
-   *   An nested array where each inner array has the following values: test
+   *   A nested array where each inner array has the following values: test
    *   field name, base field status, list of field columns, name of the column
    *   to be retrieved, expected result, whether an exception is expected.
    */
diff --git a/core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageTest.php b/core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageTest.php
index 5d56929..3433d2f 100644
--- a/core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageTest.php
@@ -144,7 +144,7 @@ public function testGetBaseTable($base_table, $expected) {
    * Provides test data for testGetBaseTable().
    *
    * @return array[]
-   *   An nested array where each inner array has the base table to be returned
+   *   A nested array where each inner array has the base table to be returned
    *   by the mocked entity type as the first value and the expected return
    *   value of SqlContentEntityStorage::getBaseTable() as the second
    *   value.
@@ -189,7 +189,7 @@ public function testGetRevisionTable($revision_table, $expected) {
    * Provides test data for testGetRevisionTable().
    *
    * @return array[]
-   *   An nested array where each inner array has the revision table to be
+   *   A nested array where each inner array has the revision table to be
    *   returned by the mocked entity type as the first value and the expected
    *   return value of SqlContentEntityStorage::getRevisionTable() as the
    *   second value.
@@ -261,7 +261,7 @@ public function testGetRevisionDataTable($revision_data_table, $expected) {
    * Provides test data for testGetRevisionDataTable().
    *
    * @return array[]
-   *   An nested array where each inner array has the revision data table to be
+   *   A nested array where each inner array has the revision data table to be
    *   returned by the mocked entity type as the first value and the expected
    *   return value of SqlContentEntityStorage::getRevisionDataTable() as
    *   the second value.
diff --git a/core/themes/classy/templates/dataset/item-list--search-results.html.twig b/core/themes/classy/templates/dataset/item-list--search-results.html.twig
index e9928fd..0a5da4d 100644
--- a/core/themes/classy/templates/dataset/item-list--search-results.html.twig
+++ b/core/themes/classy/templates/dataset/item-list--search-results.html.twig
@@ -13,7 +13,7 @@
  * - attributes: HTML attributes to be applied to the list.
  * - empty: A message to display when there are no items. Allowed value is a
  *   string or render array.
- * - context: An list of contextual data associated with the list. For search
+ * - context: A list of contextual data associated with the list. For search
  *   results, the following data is set:
  *   - plugin: The search plugin ID, for example "node_search".
  *
diff --git a/core/themes/stable/templates/admin/admin-page.html.twig b/core/themes/stable/templates/admin/admin-page.html.twig
index 106876f..ea69e99 100644
--- a/core/themes/stable/templates/admin/admin-page.html.twig
+++ b/core/themes/stable/templates/admin/admin-page.html.twig
@@ -5,7 +5,7 @@
  *
  * Available variables:
  * - system_compact_link: Themed link to toggle compact view.
- * - containers: An list of administrative blocks keyed by position: left or
+ * - containers: A list of administrative blocks keyed by position: left or
  *   right. Contains:
  *   - blocks: A list of blocks within a container.
  *