The imperative is the command form; it's when we tell or ask somebody to do something. In French, the imperative is formed from the second person singular or -tu form of the present tense, and also from the second person polite/plural -vous form, again of the present tense. It also includes the form "let's do..." which is represented by the first person plural or -nous form of the present tense, without the pronoun -nous. With some practice, you'll be able to properly use the imperative command form in French...