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 lessons

you should wear uniform

you should listen to the teacher carefully

you should  do your homework 

you should help your classmates

you should bring all your textbooks at school

you should be more attentive at the lessons

you should not shout during the lessons and breaks

you should not be late at school.