Imperatives in Greek grammar are used to give commands or orders to one or more people. The imperative form is unique because it does not have all the tenses that other verb forms have. It only exists in the present and the aorist tense. The choice between the two tenses depends on whether the command requires immediate action (aorist) or is a general instruction (present). Imperatives are quite unique in their formation; the ending will depend on whether you are addressing a single person or multiple people.