7.6. Syntactic functions of adverbs

The main function of adverbs is that of adverbial modifier. For example: They got up early in the morning. (adverbial modifier of time) The travelers were walking eastward, (adverbial modifier of direction) He began to work very deliberately and carefully, (very — adverbial modifier of degree; deliberately, carefully — adverbial modifiers of manner) He worked so hard that eventually made himself ill. (adverbial modifier of cause)

Besides adverbs may be used as part of a compound predicate: At last the holidays are here. Where is your home? — It's over there.