Must / Mustn't / Have to / Don't Have to

Here is a reminder of how to use must / mustn’t / have to / don’t have to:

Must: we use must when we feel an obligation to do something – you decide!

Example: I must phone my sister for her birthday.

Mustn’t: we use mustn’t when we are not allowed to do something.

Example: you mustn’t eat in class.

Have to: we use have to when the obligation comes from external factors – somebody else decides!

Example: I have to pay taxes.

Don’t have to: we use don’t have to when we are not obliged to do something.

Example: I don’t have to write a long letter.

Choose the correct option:

1- I must / have to visit my friend. It is her birthday.

2- Sam has to / must wear uniform at school.

3- You don’t have to/ have to go to the supermarket. I’ll do it.

4- You don’t have to / mustn’t swim in this part of the river. It is very dangerous.

5- You must / don’t have to drink a lot of water in hot weather.

7- I have to / must tidy my room this weekend.

8- We have to /mustn’t arrive late to school.

Rewrite the sentences using the words given:

1- You are not allowed to talk during the test. (mustn’t)

…………………………………………………………………………………………………….

2- It isn’t necessary to bring food. (don’t have to)

…………………………………………………………………………………………..

3- I’m obliged to finish this letter before midday. (have to)

………………………………………………………………………………………….………….

4- You are not allowed to leave the classroom without permission. (mustn’t) ………………………………………………………………………………………………………………………...

5- It isn’t necessary to pay for the tickets. They are free. (don’t have to) ..........................................................................................…………..

Can you write 4 of your own sentences using must / mustn't / have to / don't have to? 😊