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Should
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Shouldn't
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You should be polite.
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You shouldn't be late.
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You should be kind and helpful.
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You shouldn't fight with your classmates.
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You should work hard.
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You shouldn't throw rubbish anywhere.
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You should protect desks and chairs.
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You shouldn't hurt trees and flowers.
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You should keep the classroom clean.
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You shouldn't write words on desks and walls.
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