Question

Exercise 24. Use the verb can/could or to be able to in the correct form followed by the appropriate infinitive 1. Have you a friend you ... (to trust)? 2. He ... not (to see) me. I came when he had gone. 3. ... you (to call) a little later? I’m afraid I'll be busy till 7. 4. He's not answering the phone. He ... not (to get) home yet. 5. She ... not (to forget) your address; she has visited you several times. 6. You ... (to join) her much later if she wants you to go to the yacht. 7. My cousin ... not (to do) it. I don't believe it. 8. I ... (to help) him but I didn't know he needed help. 9. Your English is quite good for a beginner. You ... (to read) English books in the original. 10. If your friends are planning to go to the country you ... (to go) with them. 11. He ... not still (to write) his composition. The teacher has already left the classroom. 12. I don't believe a single word of his; he ... not (to fail) to learn the news before us. 13. It ... not (to be) a joke. He means it. 14. ... you (to pass) me the bread, please? 15. Look! I ... (to lift) this chair with one hand. 16. It wasn't easy but our team ... (to win) the match. 17. She was sitting with her back to me, so I... not (to see) her face. 18. He has no idea what the book is about. He ... not (to read) it very carefully. 19. ... this old woman (to be) Laura? She ... not (to change) so much. 20. The situation was bad but it ... (to be) even worse.

Answer 1

1can trust
2couldn't see
3 Can you call..?
4He can't get home yet.
5can't forget
6You'll be able to join her....
7couldn't do
8could help
9You can read
10...you'll be able to go...
11 He can't still write...
12can't fail to...
13can't be
14Could you pass me...
15I can lift
16could win
17couldn't see
18couldn't read
19Can this old woman be Laura? She can't have changed so much.
20could be

Answer 2

Sure, here are the sentences with the correct forms of "can/could" or "to be able to":

1. Have you a friend you can trust?
2. He could not see me. I came when he had gone.
3. Can you call a little later? I’m afraid I'll be busy till 7.
4. He's not answering the phone. He has not been able to get home yet.
5. She cannot forget your address; she has visited you several times.
6. You can join her much later if she wants you to go to the yacht.
7. My cousin cannot do it. I don't believe it.
8. I could have helped him but I didn't know he needed help.
9. Your English is quite good for a beginner. You can read English books in the original.
10. If your friends are planning to go to the country, you can go with them.
11. He could not still be writing his composition. The teacher has already left the classroom.
12. I don't believe a single word of his; he could not have failed to learn the news before us.
13. It cannot be a joke. He means it.
14. Can you pass me the bread, please?
15. Look! I can lift this chair with one hand.
16. It wasn't easy, but our team managed to win the match.
17. She was sitting with her back to me, so I could not see her face.
18. He has no idea what the book is about. He has not read it very carefully.
19. Could this old woman be Laura? She has not changed so much.
20. The situation was bad, but it could have been even worse.