You must/mustn't run in the school.
Mustn't
You must/mustn't be quiet in the library.
Must
You must/mustn't listen to your teacher.
Must
You must/mustn't talk.
Mustn't
You must/mustn't feed your pets.
Must
You must/mustn't sleep in class.
Mustn't
You must/mustn't run across the road.
Mustn't
You must/mustn't play football in class
Mustn't
You must/mustn't fight with other children.
Mustn't
You must/mustn't do your homework.
Must
You must/mustn't walk on the grass.
Mustn't
You must/mustn't go fishing in the lake.
Mustn't