You ... help your friends.
must
mustn't
You ... arrive late.
must
musn't
You ... do your homework.
must
mustn't
You ... listen to the teacher.
must
mustn't
You ... eat in class.
must
mustn't
You ... put litter in the bin.
mustn't
must
You ... shout in class.
must
mustn't
You ... follow the rules in class!
must
mustn't
You ... wear the uniform.
must
mustn't
You ... study English at school.
must
mustn't
You ... arrive on time.
mustn't
must
You ... wash your hands before lunch.
mustn't
must
You ... play with your phone in the lesson.
must
mustn't
You ... sleep in class.
must
mustn't
You ... run at school.
must
mustn't
You ... study at school.
must
mustn't
