The Imperative in English

1. The form of the Imperative

We use the infinitive to form the Imperative.

Affirmative sentences Negative sentences
Come here. Don't come now.
Clean the bathroom. Don't clean the living room.
Help your father. Don't play on the computer.

Use the exclamation only when you want to make an exclamation, e.g. Stop! Help!

2. The Imperative with let's

Affirmative sentences Negative sentences
Let's ask the teacher. Let's not ask the teacher.