Adverb is a part of speech that adds meaning to a verb, to an adjective, to another adverb, or to an entire sentence. Adverbs are single words (quickly). Groups of words that act as an adverb are known as adverbials. These groups of words can take the form of adverbial phrases (in the morning) or adverbial clauses (if the meeting continues).
A speaker or writer uses adverbs or adverbials to add details that describe how, when, where, or why a thing happened. For example, My brother crawled becomes more specific when adverbs and adverbials are added: After the accident, my brother crawled painfully from the car. Adverbs and adverbials modify the verb crawled. After the accident is an adverbial phrase that tells when. The adverb painfully describes how, and the adverbial phrase from the car shows where.
