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Learn English > English lessons and exercises > English test #14439: Mustn't / don't have to
Mustn't / don't have to
Mustn't do something ==> it's necessary not to do it.
Example: fire is dangerous. you mustn't play with it.
Don't have to do something ==> you don't need to do it but if you want, you can.
Example: you don't have to tell me everything.
Good luck, everybody.
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