The imperative is one of the moods of the verb. It is the mood of command or ordering, expressed by the inflections or forms of the verb. These are normally the base form of the verb; sometimes they can be the base form of an auxiliary verb used with the appropriate infinitive of the lexical verb. The imperative verb is normally in simple aspect, and does not have tense. The imperative sentence does not usually have a Subject. (The Subject is usually taken as an unsaid 'You'.) The imperative sentence may also contain any of the types of Complement and/or adverbials.
It was traditional to mark the imperative in writing with an exclamation mark, but this is less common nowadays
Examples: "Run!", "Go away!", "Do your assignment by next Monday" and "Run as fast as you can - but don't make a sound."
- You may also want to see Imperative - imperial - imperious for some clarification of similar words.