Ответ:

1) They have never been to California.

2) Robert is only two but he has learnt to swim very well yet.

3) Celia had broken her leg when she was on holiday last winter.

4) I haven't done my homework, I'll do it after lunch.

5) Have you ever driven a car in England?

6) I'm afraid you can't talk to him now, he has just gone out.

Объяснение: