Must and Mustn’t: Examples & Exercises

We use must and mustn’t to talk about rules, important things, and things that are not allowed. These words help us say what is necessary or what is prohibited. Look at the infographic below to understand the main uses of must and mustn’t.

This page is an A1-A2 version of Modals of Obligation and Necessity and Modals of Prohibition and Permission.

Must and Mustn’t – Main Uses

Rules (strong obligation)

We use must to talk about rules or things that are very important. These rules can come from: the law, school, work. Examples:

• You must wear a seatbelt.
• Students must arrive on time.
• You must stop at a red light.

Note: Must vs Should

Must for important things (personal obligation)

We use must when we feel something is important for us. This is a personal decision, not a rule. Examples:

• I must call my father today.
• We must study more this week.
• I must drink more water.

Mustn’t for prohibition

We use mustn’t to say something is not allowed, prohibited. It is often a rule. Examples:

• You mustn’t smoke here.
• We mustn’t use our phone in class.
• You mustn’t run near the pool.

Note: Mustn’t vs Don’t have to

Must and Mustn’t Exercises

EXERCISE: Must / Mustn’t – choose the right sentence

Choose the correct sentence according to the picture.

1 / 10

Choose the correct sentence:

You mustn’t run near the swimming pool.

You must run near the swimming pool.

You mustn’t ran near the swimming pool.

2 / 10

Choose the correct sentence:

You mustn't stop at the red light.

You must stopped at the red light.

You must stop at the red light.

3 / 10

Choose the correct sentence:

I must drunk more water every day.

I mustn't drink more water every day.

I must drink more water every day.

4 / 10

Choose the correct sentence:

Students must raised their hands before speaking.

Students mustn't raise their hands before speaking.

Must students raise their hands before speaking?

5 / 10

Choose the correct sentence:

We must bring our books to class?

Must we bringing our books to class?

Must we bring our books to class?

6 / 10

Choose the correct sentence:

Must we wear a uniform at work?

Must we wearing a uniform at work?

We must we wear a uniform at work?

7 / 10

Choose the correct sentence:

You must cleaned your hands before eating.

You must clean your hands before eating.

You must cleaning your hands before eating.

8 / 10

Choose the correct sentence:

You mustn’t fed the animals in the zoo.

You mustn’t feed the animals in the zoo.

You must feed the animals in the zoo.

9 / 10

Choose the correct sentence:

You mustn’t shouting in the hallway.

You mustn’t shout in the hallway.

You must shout in the hallway.

10 / 10

Choose the correct sentence:

You mustn't wear a helmet on a bike.

You must wear a helmet on a bike.

You must wearing a helmet on a bike.

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