1. didn't enjoy
2. Have you ever had any serious illnesses?
3. have come
4. Who has eaten all the apples?
5. have had
6. moved
7. We have often wondered...
8. Do you know that they were born on the same day?
9.How often have you fallen in love?
10. I am delighted to tell you that you have passesd your exam.
11. used
12.wasn't written
13.I have already broken two plates.
14. have met
15. You have always been my closest friend.