When using the imperative mood, what is most often the subject of the verb

Answer 1

The imperative form of a verb is used to give an order or make a request. The subject, not written or spoken, is understood to be “you”. The order, “Close the door.” is actually a statement, “You will close the door.” The more polite request form shows this to be true: “Will you close the door (please)?”

“(You will) close the door.”

”Will you close the door, (please)?”

In either case, the real antecedent of the pronoun subject “you” can be used:

“Jake, close the door.”

”Jake, will you close the door, please?”

Answer 2

For the imperative mood, the subject is hidden in the sentence, but it implied. The imperative mood most often uses the subject "you" or "you all". You are talking to someone else directly when you use the imperative command.