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Obligation and Prohibition
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Three things you didn't have to do when you were young.
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Three things you have to do after class.
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Three things you mustn't do when you are driving a car
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Three household chores you had to do as a child.
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Three things you don't have to do if you shop online.
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Three things you mustn't do in a cinema.
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Three things you have to do if you have a pet.
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Three things a teacher has to do before a class.
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Three things you had to do last week.
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Three things you have to take with you if you go abroad.
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Three things you don't have to do when you are on holiday.
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Three things you had to buy last week.
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Three things you have to do every day.
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Three things you mustn't do in class.
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Three things you mustn't do in a public place.
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Three things you wish you didn't have to do.
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Three things you must do if you want to lose weight.
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Three things you must do before you get on an airplane.
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Three things you have to do in the morning.
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Three things you have to do if you want to improve your English.
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Three things you mustn't do in a restaurant.
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