Сiii. complete the sentences using must, mustn’t, (don’t) have to, couldn’t, ought to, shouldn’t. 1) you … work on saturday. it’s a day off. 2) i saw tina in town last night. – you … have seen her. she was on holiday in spain. 3) if you don’t understand anything you … ask your teacher to help. 4
you … take your dog into the supermarket. it’s not allowed. 5) i can’t go to the cinema with you today. i … visit my grandparents. 6) the exam was rather difficult and i … answer all the questions. 7) you … be at work by nine o’clock. – i promise i won’t be late. 8) i feel very tired today. – you …
have stayed so late last night. 9) i’ve got a terrible toothache. – you … visit a doctor