You mustn't use your phone.
You mustn't use your phone.
You mustn't listen to music.
You mustn't listen to music.
You mustn't talk.
You mustn't talk.
You mustn't cross the road here.
You mustn't cross the road here.
You mustn't run here.
You mustn't run here.
You mustn't go left.
You mustn't go left.
You must listen to the teacher.
You must listen to the teacher.
You must be quiet.
You must be quiet.
You must ride on the path.
You must ride on the path.
You must put your hand up.
You must put your hand up.
You must respect your classmates.
You must respect your classmates.
You must wear a helmet.
You must wear a helmet.