The key answer of exercise 5
The key to exercise solutions in chapter 8c - Grammar in use for the textbook On Screen B2+ - Student's Book with authors Virginia Evans and Jenny Dooley from Express Publishing
Question
Read the examples. Which modal verb(s) do we use to say that we are sure something happened / didn’t happen? it's possible / probable that something happened / didn’t happen?
Answer
- We use must have to say we are sure that something happened.
- We use can't / couldn’t have to say we are sure something didn’t happen.
- We use might / may have to to say that it’s possible / probable that something happened / didn’t happen.