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. ___________