- Read about the grammar.
- Play the games to help you practise.
- Print the activity sheet for more practice.
- Remember to leave a comment!
Modals – 'must' and 'mustn't'
We can use must and mustn't to talk about rules and obligations.
I must do my homework. We must wear our school uniform.
You mustn't be late for class. We mustn't speak when the teacher's speaking.
How to use them
Must means 'Do it!' If you don't do it, you will be in trouble.
You must listen to the teacher.
Mustn't means 'Don't do it!' If you do it, you will be in trouble.
We mustn't forget our books.
Use the infinitive without to after must and mustn't.
Children must respect their parents.
Parents must take care of their children.
You mustn't shout in the library.
Mustn't mean do not do and must mean you have to do. I'll give you
You must listen to the teacher because if you don't, you don't know what to do.
You must wear the correct school uniform.
You mustn't be rude to your friends.
You mustn't shout in someone's ear.
Unfortunately some of our games don't work on mobile phones or tablets.
If you're using a computer you may need to update your version of Flash or enable it in your browser. Can you ask an adult to help you? If you still have a problem, please ask them to email us.
LearnEnglish Kids team