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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.
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Mustn't mean do not do and must mean you have to do. I'll give you
some examples.
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.