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
Question
In some of these sentences, must is wrong or unnatural. Correct the sentences where necessary.
Answer
OK / have to
I have to work
OK / have to
He has to work.
I had to work late yesterday evening.
OK / have to
She has had to wear glasses since she was very young.