Here are the completed sentences with the verbs in their correct forms:

1. I **haven't played** (not/play) tennis since I was at school.
2. **Have** you **chosen** (choose) a dress for the party yet?
3. **Have** you **sold** (sell) your house yet?
4. How long **have** you **known** (know) Jonathan?
5. I **met** (meet) him in 2009, so I **have known** (know) him for 3 years.
6. What **happened** (happen) to Lucy last night?
7. **Did** you **go** (go) to the wedding last night?
8. I **have never been** (never be) to Paris.
9. This year I **have traveled** (travel) to Athens 3 times so far.
10. Paul and Judith **have been** (be) married since 1998.
11. Have you **finished** (finish) your homework yet?
12. When **did** you **come** (come) to Greece?
13. I **came** (come) in 2007.
14. **Did** you **watch** (watch) the film E.T. yesterday?
15. They **have already left** (leave) the train station.
16. We **went** (go) to the restaurant last night.
17. I **earned** (earn) a lot of money last month.
18. Jenny **hasn't arrived** (not/ arrive) yet.
19. The people **do not like** (not/ like) the latest decisions of their authorities.
20. The kids **visited** (visit) their grandparents since last Sunday.
21. We **did not meet** (not meet) Tommy last night.
22. I **visited** (visit) an art gallery recently.
23. Dean **has not slept** (not/sleep) yet. He’s still playing games.
24. He **worked** (work) as a strategic advisor at this company for a year.
25. I **knew** (know) Mark for 10 years, but then he went abroad and we lost touch.
26. How long **have** you **known** (know) Johnny? I know you see him often.
27. We **have not seen** (not see) each other since last year.
28. She **has studied** (study) English for three years.