Mood is the mode or manner in which the action denoted by the verb is represented. There are three moods in English:
The imperative mood is used to express a command. Examples are given below.
Close the door.
Open your book.
Pay your dues.
It is also used to express an exhortation or a prayer or a request.
Take care of your health.
Have mercy upon us.
Give us this day our daily bread.
In all of the sentences given above, the verb is said to be in the imperative mood.
Definition of the imperative mood
A verb which expresses a command, an exhortation, a prayer or an entreaty is in the imperative mood.
Strictly speaking, the imperative mood can only be used in the second person because the person commanded must be the person spoken to. But by using ‘let’ a similar idea can be expressed with the first and third person pronouns.
Let me go.
Let us go.
Let us wait.
Let them go.
The subject of the verb in the imperative mood (you) is not normally mentioned because it is understood.