Задание: Divide your school rules into 2 groups. First say what you must do at school. Then say what you mustn"t do.
Example: We mast come to school on time.
We mastn"t be late for school.

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Лучший Ответ!
At school you MUST DO : 1. Come on time; 2. Listen to the teacher at the lessons. ;
3. Be quiet at the lessons. 4.Do all your homework ; 5. Do what your teacher said to do. 
You MUSTN'T DO :  1. Be late. 2. Make some noise at the lessons. 3.Speak at the lessons. 4.Run in the hall. 5.Break school's things.

Надеюсь столько хватит.