You should be on time for lessons., , You mustn’t be late for lessons., , You must come to class every day., , You should bring your coursebook to school., , You mustn’t draw on your desk., , You should revise for an exam., , You must study to pass the exam., , You shouldn’t miss a class., , You must listen to your form teacher., , You should get good marks if you study., , You shouldn’t get bad marks., , A lesson should last 45 minutes., , Children must go to primary school., , After primary school, students must go to secondary school., .

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