The three uses of the subjunctive now most frequent are, to express a wish, a concession, and condition contrary to fact.
In spoken English, the subjunctive were is much used in a wish or a condition contrary to fact, but hardly any other subjunctive forms are.
It must be remembered, though, that many of the verbs in the subjunctive have the same form as the indicative. Especially is this true of unreal conditions in past time; for example,—
Were we of open sense as the Greeks were, we had found [should have found] a poem here.—Carlyle.
IMPERATIVE MOOD.
Definition.
231. The imperative mood is the form of the verb used in direct commands, entreaties, or requests.
Usually second person.
232. The imperative is naturally used mostly with the second person, since commands are directed to a person addressed.
(1) Command.