Imperative Mood.
The Imperative Mood orders, advises or begs. It is used only in the Second Person. The subject of the verb in the Imperative Mood is often omitted.
A few models.
Come along! You, I say, come along!
Don't be so silly!
Send for a doctor at once!
Homework.
Find/note/list/figure out Imperative Mood whenever/wherever it is used.