Armed Forces Classification Test (AFCT) English Practice Exam – Practice Test Prep & Study Guide

The word "quickly" is classified as an adverb because it describes how an action is performed. Adverbs are words that modify verbs, adjectives, or other adverbs, providing more detail about the manner, time, place, or degree of the action or quality being expressed. In this case, "quickly" modifies a verb to indicate that the action is done in a speedy manner.

For instance, in a sentence like "She ran quickly," the adverb "quickly" tells us more about the verb "ran," specifically how she ran. This highlights the action's manner, which is the primary function of adverbs. Other parts of speech, such as nouns and adjectives, do not serve this particular purpose. A noun names a person, place, thing, or idea, while an adjective describes a noun. Therefore, the classification of "quickly" as an adverb is appropriate, as it aligns with its function in providing clarity on how an action takes place.