I. Put in "can, can't, could, couldn't, mustn't, don't / doesn't have to or must". If none of these is possible use "be able to" in the correct tense.
1. __________ you swim when you were 10?
2. We __________ get to the meeting on time yesterday, because the train was delayed by one hour.
3. He ________ arrive at the party on time, even after missing the train, so he was very pleased.
4. Children __________ tell lies. It's very naughty.
5. John's a millionaire. He __________ go to work.
6. He's amazing, he __________ speak five languages, including Chinese.
7. I __________ drive a car until I was 34. Then I moved to the countryside, so I had to learn.
8. She's seven years old, but she __________ read yet. Her parents are getting her extra lessons.
9. I read the book three times, but I __________ understand it.
10. We __________ rush. We've got plenty of time.
11. Why is that man looking around like that? He __________ be lost.
12. She __________ do this work today, because she can do it tomorrow.
13. I __________ open this window! I think it's stuck.
14. My grandmother __________ use a computer until last month. Since then she's been taking lessons at the library.
15. What a lot of lovely flowers you have! You __________ really like gardening.
16. I __________ clean the floor today because I cleaned it yesterday.
17. They __________ get up early today, because it's Sunday.
18. Gill __________ play the piano. She has never studied it.
19. David __________ drink a lot of coffee. He's finished two packets already this week.
20. This __________be Jamie's coat. He's tall and this is tiny.
