наречие

The Russian part of speech 'наречие' (adverb) is used to modify verbs, adjectives, or other adverbs, providing additional information about manner, place, time, frequency, degree, or reason. Adverbs can describe how an action is performed, when it occurs, or to what extent something is true. For example, in the sentence 'Он быстро бегает' (He runs quickly), 'быстро' (quickly) is an adverb that modifies the verb 'бегает' (runs), indicating the manner of running.