You must/mustn't
You mustn't use your phone here
You must/mustn't
You must do your homework every day.
You must/mustn't...
You must be quite
You must/mustn't
You musn't walk on the grass
You must/mustn't
You must wash your hands.
You must/mustn't
You mustn't drive more than 25 mph in this zone.
You must/mustn't
You mustn't sleep in the class
You must/mustn't
You musn't eat.