Yes, in the sentence "Clean your room now!", the word "clean" is the verb that is modified by the adverb "now." The adverb "now" adds a sense of urgency or immediacy to the action of cleaning.
No, in this sentence, "clean" is not an adverb modifying the verb "is." Instead, "clean" is being used as an adjective to describe the state or condition of the room. Adjectives typically modify nouns or pronouns, providing further description or information about them. In this case, "clean" is describing the room, indicating that it should be in a tidy or organized state.
