You must always do your homework.
You must wear a school uniform.
You must arrive at school on time.
You mustn't shout in class.
You mustn't eat in class.
You must listen to the teacher.
You must always do your homework.
You must wear a school uniform.
You must arrive at school on time.
You mustn't shout in class.
You mustn't eat in class.
You must listen to the teacher.