3. 

→I've played tennis for a year

4.

→He has used the computer since he was 19

→when đổi thành since

5.

→She hasn't learnt hard since 2005

→in đổi thành since

6.

→Peter has watched this film since he came home

→when thành since

7.

→I haven't seen her for a week

8. 

→The boys have played soccer for a year

9.

→Has Dad worked here since i was born?

10

→How long ago did you first see her?

→How long ago + trợ động từ+S+V+O

11.

→We haven't seen her for 2 months

→Bỏ was

12. 

→Tom hasn't worked here since i met him on the street.

→when thành since

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