Here are two senses for 'adverb': An adverb, narrowly defined, is a word belonging to a class of words which modify verbs for such categories as time, manner, place, or direction. An adverb, broadly defined, is a word belonging to a class of words which modify any constituent class of words other than nouns, such as verbs, adjectives, other adverbs, phrases, clauses, or sentences. Under this definition, the possible type of modification depends on the class of the constituent being modified.
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