You must be quiet! you must't run in the class. you must listen to your teacher.you mustn't argue with your teacher or friends. you must ask teacher's question.you must study.you mustn't talk to louder.
You must hear carefully your teacher. You mustn't talk while the lessons. You mustn't argue and fight with your friends . You must wear a uniform. You mustn't run at school. You mustn't break anything at school. You mustn't use your mobile phone at the lessons. You must have with yourself all equipment for school. You must visit all lessons. You mustn't smoke or drink alcohol at school . You mustn't have with yourself any dangerous things .
