Change the verbs in these sentences (a) to the past tense, (b) to the future tense, (c) to the perfect present tense. Study the examples carefully.

1. I spend my money (a) I spent my money.
(b) I will spend my money.
(c) I have spent my money.
2. They use that one (a) They used that one.
(b) They will use that one.
(c) They has used that one.
3. We study English together (a) We studied English together.
(b) We will study English together.
(c) We have studied English together.
4. They discuss their work (a) They discussed their work.
(b) They will discuss their work.
(c) They have discussed their work.
5. They have enough time (a) They had enough time.
(b) They will have enough time.
(c) They have had enough time.
6. I do all of the lesson (a) I did all of the lesson.
(b) I will have do all the lesson.
(c) I have did all of the lesson.
7. He sits in that row (a) He sitted in that row.
(b) He will sit in the row.
(c) He has sitted in the row.
8. I drive my car (a) I drove my car.
(b) I will drive my car.
(c) I have drove my car.
9. She hides her money (a) She hid her money.
(b) She will hide her money.
(c) She has hid her money.
10. We go to school (a) We went to school.
(b) We will go to school.
(c) We have went to school.
11. He takes much time (a) He took much time.
(b) He will take much time.
(c) He has took much time.
12. Does he eat there? (a) Did he eat there ?
(b) Will he eat there ?
(c) Has he eaten there ?
13. Do you enjoy that work ? (a) Did you enjoy that work ?
(b) Will you enjoy that work ?
(c) Have you enjoyed that work?
14. Does he write many letters ? (a) Did he write many letter ?
(b) Will he write many letter ?
(c) Has he wrote many letter ?
15. Do you send many letters ? (a) Did you send many letter ?
(b) Will you send many letter ?
(c) Have you sent many letter ?
16. Do they explain everything ? (a) Did they explain everything ?
(b) Will they explain everything ?
(c) Have they explained everything ?
17. Does she attend that class ? (a) Did she attend that class ?
(b) Will she attend that class ?
(c) Has she attended class ?
18. Do you have enough time ? (a) Did you have enough time ?
(b) Will you have enough time ?
(c) Have you had enough time ?
19. Do they copy the sentences ? (a) Did they copy the sentences ?
(b) Will they copy the sentences ?
(c) Have they copied the sentences ?
20. Does she have much trouble ? (a) Did she have much trouble ?
(b) Will she have much trouble ?
(c) Has she had much trouble ?
21. Does she do good work ? (a) Did she do good work ?
(b) Will she do good work ?
(c) Has she done good work ?
22. Do the students practise ? (a) Did they practise ?
(b) Will they practise ?
(c) Have they practi
23. I don’t stay there (a) I didn’t stay there
(b) I won’t stay there
(c) I haven’t stayed there
24. He doesn’t work hard (a) He didn’t work hard
(b) He won’t work hard
(c) He haven’t worked there
25. I don’t have any energy (a) I didn’t have any energy
(b) I won’t haved any energy
(c) I haven’t haved any energy
26. He doesn’t pay his bills (a) He didn’t pay his bills
(b) He won’t pay his bills
(c) He haven’t payed his bills
27. We don’t see that fellow (a) We didn’t see that fellow
(b) We won’t see that fellow
(c) We haven’t seen that fellow
28. She doesn’t use this one (a) She didn’t use this fellow
(b) She won’t use this one
(c) She haven’t used this one
29. They don’t remember it (a) They didn’t remember it
(b) They won’t remember it
(c) They haven’t remember it
30. I don’t do much work here (a) I didn’t do much work here
(b) I won’t do much work here
(c) I haven’t do much worked here
31. He doesn’t listen carefully (a) He didn’t listen carefully
(b) He doesn’t listen carefully
(c) He haven’t listed carefully