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You shouldn't play computer games all day.
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You should sleep 8 hours / You should go to bed early.
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You should see a doctor.
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You shouldn't watch TV every day.
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You shouldn't listen to loud music.
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You should eat a lot of fruits.
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She should wear a hat.
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You should have breakfast every day.
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You should brush your teeth twice a day.
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You should wash your hands before you eat.
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You shouldn't eat fast food every day.
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You should eat a lot of vegetables.
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You should do sports / You should go to the gym.
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You should read books.
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You shouldn't eat a lot of candy.
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You shouldn't get fat/ You should do sports.