How can you tell if a sentence is an adverb?

Answer 1

A sentence wouldn't be an adverb. A sentence is a group of words that contains a subject and a verb and forms a complete thought. It may or may not contain an adverb (a word that modifies a verb, an adjective, or another adverb).

Answer 2

A sentence cannot be an adverb; adverbs are words that modify verbs, adjectives, or other adverbs within a sentence. To identify an adverb in a sentence, look for words that answer questions like how, when, where, or to what extent an action is performed.