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Составитель 10 предложений на тему ,поведение в школе. Must, mustn't, can, can't.
(Нельзя бегать по коридорам, нельзя разговаривать на уроке. И т.д.)

you should be calm  at the lessonsyou should wear uniformyou should listen to the teacher carefullyyou should  do your homework you should help your classmatesyou should bring all your textbooks at schoolyou should be more attentive at the lessonsyou should not shout during the lessons and breaksyou should not be late at school.