Let’s look at the article below which will briefly discuss is tomorrow an adverb.
Adverbs are words that modify verbs or other adverbs. They often answer questions such as how, when, where, and why. An adverb typically describes how an action is performed, how often something happens, or when it happens. The adverb “tomorrow” is a special type of adverb that describes when something will happen. It is used to refer to something that will happen in the future. But is tomorrow an adverb? The answer is yes.