Ex2: Give the correct form of the verbs in the brackets
1. I (need) some money for my textbooks now 
2. I tthink John ( be) out of town now
3. Your friends ( walk) to school everyday? No,...
4. Where your children (be) now? They are upstairs. They(play) video games
5. Listen! I (hear) someone knocking at the door
6. Your mother ( walk) to work everyday? YES,...
7. She can't go out because she ( do) her homework
8. The earth (circle) the sun once every 365 days
9. We hope that we (be) able to attend the course
10. Who you ( go) to the cinema with last night?
11. The student ( look up) that new word right now
12. My friends ( not listen) to the music at this time
13. Don't talk in class! The teacher ( explain) the lesson
14. Listen to this! I think this news ( surprise)
15. Where you ( go)? I (go) to the zoo
16. At present, the author (write) a historical novel
17. The farmers ( work) in the field at the moment
18. Where are you? I'm upstairs. I (have) a bath
19. Mr. Green (teach) English in this school since he ( graduate) from the university in 1986
20. I (be) in this town for 15 years. My family (move) here when I (be) 10 years old
21. Mr. John (be) principal of our school since last year
22. When I (be) a child, I (want) to be a doctor
23. "You (know) the way to the Globe Theatre?" No. Then I (show) you
24. Our English teacher ( explain) that lesson to us tomorrow
25. You have just missed the last train. Never mind, I (walk) 
26. Don't call me in the afternoon. I usually (be) away in the afternoon
27. John( drive) that car since I (know) him
28. My sister often(stay) at home and (watch) TV on Sunday
29. I (do) an exercise on the present tenses at this moment and I (think) that I (know) how to use it now
30. How many times you (see) him since he (go) to Edinburgh?
31. We (not receive) any letter from him since he ( leave) four months ago
32. We (be) from France. We (be) there for 20 years
33. I( read) the novel written by Jack London several times before
34. Our teacher (tell) us yesterday that he ( visit) England in 1970
35. You( speak) to Mrs. Baker yesterday? No, I (not see) her for a long time. I can't remember when I last (see) her
36. His sister (see) that film several times because she ( like) it
37. Up to present, we (write) almost every lesson in the book