Modals: Degree of probability 6 Rewrite the sentences using must, can’t or may/might/could. Use the Grammar button to refer to the theory. 1 Perhaps Paul has a fear of heights. 2 I’m sure that Sally is scared of mice. 3 Perhaps Chris was tired. 4 I’m sure that James was worried about flying. 5 I’m sure Anna isn’t afraid of meeting new people.

1. Paul must have a fear of heights.

2. Sally can't be scared of mice.

3. Chris may/might/could have been tired.

4. James must have been worried about flying.

5. Anna can't be afraid of meeting new people.