Modal verbs (must, can't, may/might)
Change the sentences using modal verbs, then press "Check" to check your answers.
1. I’m sure she is at school.
She
at school.
2. I’m sure Susan has paid the bill.
Susan
the bill.
3. Perhaps he was ill.
He
ill.
4. It’s impossible that they missed the plane.
They
the plane.
5. I’m certain he isn't working at the library.
He
at the library.
6. I’m sure she knows him well.
She
him well.
7. Perhaps they went home.
They
home.
8. It’s impossible that he’s telling the truth.
He
the truth.
9. It is possible that he’s working late tonight.
He
late tonight.
10. Perhaps they have missed the bus.
They
the buss.
11. I’m certain he was sleeping.
He
.
12. Perhaps she has been lying.
She
.
13. It’s impossible that she saw us.
She
us.
14. I’m sure they are studying.
They
.
15. It is possible that she has finished her work.
She
her work.
Check
Hint
OK