In English, we can tell people what to do by saying things like “go to the store” or “bring me a drink.” Because it's a direct order to someone, there doesn't really need to be a subject pronoun, because you know who's supposed to do what in the conversation. In French, this operates much the same way and is done using the imperative form of the verb.

The imperative form of the verb is based on the present-tense conjugation. There are three possibilities using the imperative form. The first two use either the tu or the vous form of the verb, and the third uses the nous form. To form the imperative, simply drop the subject pronoun from the construction, which turns it into an order.

Tu Form

The tu form of the verb is used when you are giving an order to one person with whom you are very familiar. If you want to give an order to someone you don't know very well, use the vous form instead. For verbs ending in -er, when the verb is used in the imperative, the “s” is dropped from the end of the tu form in written French. In spoken French, the “s” in the tu form isn't pronounced anyway, so you shouldn't notice much of a difference. This happens only with verbs ending in -er, however. The “s” is maintained at the end of the word in verbs ending in -ir and -re.