Fill in all the gaps, then press "Check" to check your answers.
PART 1. "Can", used to express ability with "could", "shall/will be able". Fill the following spaces, using "can" for present, "could" for past and "shall/will be able" for future. There is no need to use other "able" forms in this section. Put "to" where necessary before the infinitives.
1. you stand on your head? -I when I was at school but I (not) now.
2. When I've passed my driving test I hire a car from our local garage.
3. At the end of the month the Post Office will send him an enormous telephone bill which he (not) pay.
4. I (not) remember the address, - (not) you even remember the street? (Present)
5. When the fog lifts we see where we are.
6. You've put too much in your rucksack; you (never)carry all that.
7. When I was a child I (not)understand adults, and now that I am an adult I understand children.
8. When you have taken your degree you put letters after your name?
9. Don't try to look at all the pictures in the gallery. Otherwise when you get home you (not) remember any of them.
10. When I first went to Spain I read Spanish but I (not) speak it.
11. you type? - Yes, I type but I (not) do shorthand.
12. I'm locked in. I get out! - you squeeze between the bars? (разве ты не можешь?) - No! I ; I'm too fat.

  PART 2. "Could" and "was able". In some of the following sentences either "could" or "was able" could be used. In others only "was/were able" is possible. Fill the spaces and put "to" where necessary before the infinitives.

13. He was very strong; he ski all day and dance all night.
14. The car plunged into the river. The driver get out but the passengers were drowned.
15. I was a long way from the stage. I see all right but I (not) hear very well.
16. We borrow umbrellas; so we didn't get wet.
17. (you) walk or did they have to carry you?
18. I had no key so I (not)lock the door.
19. I knew the town so I advise him where to go.
20. When the garage had repaired our car we continue our journey.
21. At five years old he read quite well.
22. When I arrived, everyone was asleep. Fortunately, I wake my sister and she let me in.
23. The swimmer was very tired but he reach the shore before he collapsed.
24. The police were suspicious at first but I convince them that we were innocent.

PART 3. This section includes examples of "can" and "could" used for polite requests and as a conditional.
25. I speak to Mr Pitt, please? - I'm afraid he's out at the moment you ring back later?
26. If you stood on my shoulders you reach the top of the wall? - No, I'm afraid I (not)
27. If I sang you accompany me on the piano? - No, I (not), I (not) play the piano!
28. If a letter comes for me you please forward it to this address?
29. She made the wall very high so that boys (not) climb over it.
30. They took his passport so that he (not) leave the country.
31. you tell me the time, please? - I'm afraid I (not). I haven't got a watch.
32. If you had to, you go without food for a week? - I suppose I , if I had plenty of water.
33. you lend me $5? -No, I .
34. They used to chain valuable books to library desks so that people (not)take them away.
35. He says that he saw Clementine drowning but (not) help her as he (not) swim.
36. If you had had the right tools, you have repaired the engine?