Complete the following sentences using must or can.

1. He ………………. start coming on time.

a) must

b) can

2. I can’t find my keys. I ……………… have left them at home.

a) must

b) can

c) Either could be used here

3. The doctor said that I ……………… stop worrying.

a) must

b) can

c) Either could be used here

4. She ………………. have a problem – she keeps crying.

a) must

b) can

c) Either could be used here

5. There is the doorbell. Who ……………… it be?

a) must

b) can

c) Either could be used here

6. She hasn’t eaten for hours. She …………….. be hungry.

a) must

b) can

c) Either could be used here

7. I am busy today, but I ……………… meet you tomorrow.

a) can

b) must

8. It ……………….. be the postman. It is only 7 am.

a) can’t

b) mustn’t

9. It is six o’clock. She …………….. have reached home.

a) must

b) can

c) Either could be used here

10. She is late. There ……………….. be some problem.

a) must

b) can

c) Either could be used here

Answers

1. He must start coming on time.

2. I can’t find my keys. I must have left them at home.

3. The doctor said that I must stop worrying.

4. She must have a problem – she keeps crying.

5. There is the doorbell. Who can it be?

6. She hasn’t eaten for hours. She must be hungry.

7. I am busy today, but I can meet you tomorrow.

8. It can’t be the postman. It is only 7 am.

9. It is six o’clock. She must have reached home.

10. She is late. There must be some problem.