Adverbs are words that modify verbs, adjectives, or other adverbs. They provide information about how, when, where, or to what extent an action or quality occurs. Here is a list of common adverbs in English grammar, along with explanations and examples of their usage:

1. Quickly: Describes the speed or manner of an action.
Example: She ran quickly to catch the bus.

2. Slowly: Indicates a slow speed or manner.
Example: The turtle moved slowly across the road.

3. Happily: Shows the manner in which an action is performed, expressing joy or pleasure.
Example: They danced happily at the party.

4. Sadly: Indicates the manner in which something is done, expressing sorrow or sadness.
Example: She spoke sadly about her loss.

5. Quietly: Describes the manner of doing something with minimal noise or sound.
Example: Please speak quietly in the library.