Adverb

An adverb is a word that modifies a verb, adjective, determiner, clause, preposition, or sentence. Adverbs typically express manner, place, time, frequency, degree, level of certainty, etc., answering questions such as how?, in what way?, when?, where?, and to what extent?. This function is called the adverbial function, and may be realized by single words (adverbs) or by multi-word expressions (adverbial phrases and adverbial clauses).

Adverbs are traditionally regarded as one of the parts of speech. However, modern linguists note that the term "adverb" has come to be used as a kind of "catch-all" category, used to classify words with various different types of syntactic behavior, not necessarily having much in common except that they do not fit into any of the other available categories (noun, adjective, preposition, etc.)

She sang loudly (loudly modifies the verb sang, indicating the manner of singing) We left it here (here modifies the verb phrase left it, indicating place) I worked yesterday (yesterday modifies the verb worked, indicating time) You often make mistakes (often modifies the verb phrase make mistakes, indicating frequency) He undoubtedly did it (undoubtedly modifies the verb phrase did it, indicating certainty)

Adverbs can also be used as modifiers of adjectives, and of other adverbs, often to indicate degree. Examples:

You are quite right (the adverb quite modifies the adjective right) She sang very loudly (the adverb very modifies another adverb – loudly)