Must / Mustn't / Needn't

You don't ​have to do it - it is not necessary - but you can do it if you want to.

Mustn't

You have to do it.

​

It is important that you do it​.

Must

​Let's remember

Needn't

You have to NOT do it.

​

It is important that you don't do it.

a) needn’t

​

b) mustn’t

​

c) must

​

Sam never makes a mess, so he _________ tidy his room very often.

​

a) needn't

​

b) must

​

c) mustn't​

​

The bus is leaving in a moment, we ______ hurry

a) must

​

b) mustn't

​

c) needn't​

​

​Dad: You ________ lose that money I gave you.

Max: I'll put it in a safe place​

​

Multiple Choice

Students _________ use their mobile phones during the lessons.

• must

• mustn't

• needn't

Multiple Choice

Teachers _________ wear suits to work, but their clothes must be clean and tidy

• must

• mustn't

• needn't

Multiple Choice

You _______ arrive on time for lessons. It's important not to be late.

• must

• mustn't

• needn't

Multiple Choice

Students and teachers ________ be polite to each other.

• must

• mustn't

• needn't

Multiple Choice

Students ______ take an exam at the end of the year.

• must

• mustn't

• needn't

Multiple Choice

We ________ leave right now. We are going to be late for school.

• must

• mustn't

• needn't

Multiple Choice

We _______ speak loudly in the library. There are people want to read in peace.

• must

• mustn't

• needn't

Multiple Choice

Jack ________ buy another car because he already has three.

• must

• mustn't

• needn't