You mustn't swim here, You mustn't use your mobile phone, You must do your homework on time, You must be on time , You mustn't Park here, You mustn't eat or drink at the classroom, You mustn't run , You mustn't talk during the lesson, You must listen to the teacher, You mustn't cheat at exams or tests, You mustn't sleep in class, You must work during the lessons,

MUST or MUSTN`T

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