1. Can/Could you ( call) a little later?
2. Could it ( be) a joke?
3. You could not ( see) him at the meeting. He was ill.
4. Could we (have covered) fifteen kilometres? The village is not yet seen.
5. He can not ( forget) your address; he has visited you several times.
6. If you had let us know, we could (have sent) our car for you.
7. I should be very much obliged to you if you .could ( lend) me your dictionary for a couple of days.
8. I don't believe her, she can (have failed) to recognize me.
9. He said he could ( manage) the task by himself.
10. Why didn't you ask me? I could (have done) it for you.