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Must / mustn't? - English lesson

Positive form:
Subject + must + verb (base form)

You must study.
It is important to study.

She must wear a uniform.
It is necessary for her to wear a uniform.

We must be on time.
Being on time is important.

HOW TO USE:
You give strong advice

You talk about rules

You say something is very important

➡️  MUSTN'T = You are not allowed / It's forbidden
We use "mustn't" to say something is not allowed or dangerous.

Subject + mustn't + verb (base form)

 You mustn't run in the corridor.
 It's not safe. It's not allowed.

 He mustn't smoke here.
 Smoking is forbidden.

 We mustn't forget our homework.
 It's important to remember it.

⚠️ Be careful!
"must" = You have to do it

"mustn't" = You are not allowed to do it

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English exercise "Must / mustn't?" created by teacher974 with The test builder. [More lessons & exercises from teacher974]
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1. We mustn'tmustI don't know listen to the teacher.

2. We mustmustn'tI don't know run in the corridors.

3. We mustn'tmustI don't knowfight in the class.

4. We mustmustn'tI don't knowlearn our lessons.

5. We mustn'tmustI don't know be kind to others.

6. We mustn'tmustI don't know do our homework.

7. We mustn'tmustI don't knowchat in the class.

8. We mustmustn'tI don't know be quiet in class.

9. We mustmustn'tI don't know bring the books back to the librarian.

10. Wemustmustn'tI don't know talk back to the teacher.