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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