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.
(ii) You will do well to study at least for an hour every day.
(iii) The doctor says it is necessary for her to sleep eight hours every night.
(iv) It is right that you show respect towards elders and affection towards youngsters.
(v) If you want to stay healthy, exercise regularly.
(vi) It is good for you to take a walk every morning.
(vii) It is strongly advised that you don’t stand on your head.
(viii) As he has a cold, it is better for him to go to bed.
