16. The children ________________ (play) happily in the park when I found them.
17. ___________________ (Bill/ arrive) home yet? ~ Yes. He ___________ (arrive) three hours ago.
18. I ________________ (like) cowboy movie since I ____________ (be) a child.
19. I’ll come and see you before I _____________ (leave) for the United States.
20. We ________________ (have) four tests so far this semester.
21. As soon as Martina saw the fire, she _______________ (phone) the fire department.
22. I saw Lisa at the station when I _______________ (go) to work this morning but she _____________ (not/ see) me.
23. I _______________ (know) Jim Bates since he __________ (be) ten years old.
24. He will take a dog out for a walk as soon as he ____________ (finish) his work.
25. We ______________ (not see) Marta recently. The last time we ___________ (meet) her was in April.
26. Kathy usually ______________ (sit) in the front row during class, but today she ____________ (sit) in the last row.
27. Look at the black clouds! It ____________________. (rain)
28. I hope you ____________________ (be) able to take part in the trip to the seaside with us.
29.Please close the windows. The rain _________________. (come)
30. The earth _______________ (circle) the sun once every 365 days.