A.
1. Can
2. Could
3. we can take.....but we can't use....
4. couldn't .........now I can
5. ....No, I can't...
6. We could
7. I may go.....
8. could play....
B.
1. A
2. B
3. B
4. B
5. A
6. A
7. B
С
1 Could we go...
2 Yes, we could but...
3 Yes, but I can't swim!
4 Really? I could teach you.
5 Can you swim.....
6. Yes, I could swim when....
7. Ok. I may come.
8. Can you.....