What type of mood is expressed by the command in the sentence "Go now!"?

The command "Go now!" expresses an imperative mood. The imperative mood is used to give commands, make requests, or offer instructions. In this sentence, the speaker is directly instructing someone to perform an action, which is a clear characteristic of the imperative form. It typically involves the verb in its base form and may or may not include the subject; in this case, the subject "you" is implied.

The other moods listed serve different purposes: the indicative mood is used for stating facts or asking questions; the interrogative mood is used for forming questions; and the subjunctive mood often expresses wishes, hypotheticals, or conditions contrary to fact. Each of these moods has distinct grammatical structures and functions that categorize statements differently than commands found in the imperative form.