Imperatives
Get the phone.
Don’t do that.
Let’s go. / Let’s not go.

Explanation:
The imperative does not have a subject.
It is used to express a wish or command.
For the first person plural use let’s which replaces 'we'.
It is expressed in the present.
It has a negative form.

Examples
Go. / Let’s go. / Let’s not go. Don’t go.

Structure:
Second singular and plural + present form of the verb.
Do not + verb
Don’t + verb
In the negative there is only the plural form in the negative.
First person plural.
Let us or let’s + verb (present form).
Let us not + verb.
Let’s not +verb.