You must study for the test if you want to pass., Your classmate mustn't distract you while you're doing the experiment., We have to enter the competition if we want to win the prize., The headteacher must wear a uniform every day at school., You don't have to practise outside if it's too cold., We must stay inside during the storm., You don't have to make models if you're not interested in art class., You must wear a uniform when attending school., The teacher says you have to do the experiment before you can leave class., You musn't talk while taking the test, or you’ll be disqualified.,

Rules

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النمط البصري

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