Mustn't exercise

Must negative

Use must not in prohibitions.

I mustn't stop the car.
You mustn't stop the car
He / She / It mustn't stop the car.
We mustn't stop the car.
You mustn't stop the car.
They mustn't stop the car.

English Must need exercises

Mustn't or needn't? Fill in exercises - Things you needn't do at school and things you mustn't do at school - fill in exercises. Fill in needn't or mustn't.

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