In the sentence "The quickly running dog catches the ball," what is the part of speech for the word "quickly"?

In the sentence "The quickly running dog catches the ball," the word "quickly" functions as an adverb. Adverbs modify verbs, adjectives, or other adverbs, often providing information about how an action is performed. In this case, "quickly" describes the manner in which the dog is running; it indicates that the dog is running with speed.

Identifying "quickly" as an adverb is reinforced by its role in the sentence. It tells us more about the verb "running," answering the question of how the dog is running. This highlights the action in a way that is specific and dynamic, which is characteristic of adverbs. The presence of "quickly" also sets it apart from the other parts of speech, as nouns represent people, places, or things, verbs express actions or states of being, and adjectives provide descriptive qualities to nouns. Therefore, seeing "quickly" as an adverb aligns with its function in this context.