Fill the blanks with must or can.
1. You have been working all day. You ............................. tired.
Correct!
Wrong!
2. You ............................. such a thing.
Correct!
Wrong!
3. She has been doing the same job for several years. She ............................... bored.
Correct!
Wrong!
4. I can't find my key. I ............................. lost it.
Correct!
Wrong!
5. It .............................. be John. He is in Edinburgh.
Correct!
Wrong!
6. Who ......................... it be?
Correct!
Wrong!
7. Nobody is answering the doorbell. They ................................ out.
Correct!
Wrong!
8. That .............................. John.
Correct!
Wrong!
9. Where ........................... he have gone?
Correct!
Wrong!
10. I can't find one of my socks. You .............................. it somewhere.
Correct!
Wrong!
11. She hasn't written back. She ........................... received your letter.
Correct!
Wrong!
12. I haven't seen him for ages. He ............................ away.
Correct!
Wrong!
Answers
1. You have been working all day. You must be tired.
2. You must not say such a thing.
3. She has been doing the same job for several years. She must be bored.
4. I can’t find my key. I must have lost it.
5. It can’t be John. He is in Edinburgh.
6. Who can it be?
7. Nobody is answering the doorbell. They must have gone out.
8. That must be John.
9. Where can he have gone?
10. I can’t find one of my socks. You must have dropped it somewhere.
11. She hasn’t written back. She can’t have received your letter.
12. I haven’t seen him for ages. He must have gone away.
