Sure, I can help you with these sentences. Here are the completed versions:

9. When did you start to listen to pop music?
 
How long have you listened to pop music?
 
10. My father stopped smoking last year.
 
My father hasn't smoked since last year.
 
It's been a year since my father stopped smoking.
 
The last time my father smoked was last year.
 
11. I didn't call her up 2 days ago.
 
I haven't called her up for 2 days.
 
12. Did you finish the test an hour ago?
 
Have you finished the test yet?
 
13. I started playing tennis last year. I've
 
I've been playing tennis since last year.
 
14. He began to use the computer when he was 19.
 
He has been using the computer since he was 19.
 
15. She didn't learn hard in 2005.
 
She hasn't learned hard since 2005.
 
16. Peter watched this film when he came home.
 
Peter has watched this film since he came home.
 
17. It's a week since I last saw her.
 
I haven't seen her for a week.
 
18. The boys began playing soccer a year ago.
 
The boys have been playing soccer for a year.
 
19. Did Dad start to work here when I was born?
 
Has Dad been working here since I was born?
 
20. When did you first see her?
 
How long has it been since you first saw her?
 
21. The last time we saw her was 2 months ago.
 
We haven't seen her for 2 months.
 
22. Tom did not work here when I met him on the street.
 
Tom has not worked here since I met him on the street.
 
23. This is the first time he has forgotten his bag.
 
He has never forgotten his bag before.