Cover of the textbook English Grammar in Use

The key answer of exercise 31.3

The key to exercise solutions in chapter Unit 31 - Have to and must for the textbook English Grammar in Use with authors Raymond Murphy from Cambridge University Press


In some of these sentences, must is wrong or unnatural. Correct the sentences where necessary.


  1. OK / have to
  2. I have to work
  3. OK / have to
  4. He has to work.
  5. I had to work late yesterday evening.
  6. OK / have to
  7. She has had to wear glasses since she was very young.