Can and could

1. ________ he understand what you were talking about?

2. My sister ________ play tennis now.

3. I ________ walk when I was less than a year old.

4. (Polite) ________ you tell me what time it is, please?

5. My grandfather ________ walk without any help last night.

6. I would like to ________ play the piano.

7. How long have you ________ drive?

8. I’ll ________ help you later.

9. Can you help me? I ________ never understand this.

10. Will people ________ live forever one day?