Rewrite each of the following sentences using should/ought to/must in place of the italicised words. Make other changes wherever necessary.
(i) You are obliged to do your duty irrespective of consequences.
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(ii) You will do well to study at least for an hour every day.
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(iii) The doctor says it is necessary for her to sleep eight hours every night.
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(iv) It is right that you show respect towards elders and affection towards youngsters.
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(v) If you want to stay healthy, exercise regularly.
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(vi) It is good for you to take a walk every morning.
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(vii) It is strongly advised that you don’t stand on your head.
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(viii) As he has a cold, it is better for him to go to bed.
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