You ____ shout in the classrooms. You can have lunch at school, or you ____ go home to eat. It’s your choice. You ____ wear clean shoes to school. It’s a rule. You ____ write on the desks. If you do, you’ll get in big trouble. A: ____ I borrow your pen? B: Yes, but you ____ give it back at the end of the lesson. You ____ walk on the stairs. It’s very dangerous to run! A: Why ____ we use a pencil in the exam? B: Because the rules say you ____ use a pen. In the break time, you ____ play in the schoolyard, but you ____ stay in the classroom.

Modals must/mustn't/can/can't

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