Sure, here are the conjugated verbs for the given sentences:

I. Chia động từ:
1. She **has lived** here since 1975.
2. He **has been** in London for five days.
3. She **has been working** since nine this morning.
4. My friends **had** a great time in Nha Trang last year.
5. I **bought** a lot of gifts for my little sister last summer vacation.
6. Mr. Hung **has built** a house recently.
7. I **have been writing** to my pen pal for two months.
8. I **have not received** his reply since then.
9. He **has read** five comic books since last Monday.
10. So far he **has written** one hundred books.
11. How long **has he lived** here?
12. My father never **drinks** coffee before.
13. Minh **has not prepared** his lesson yet.
14. If it rains today, we **will stop** the trip.
15. If he **gets** proper medical care, he will survive.
16. The drought **continues**, plants and animals will perish.
17. The children **are not playing** badminton in the stadium now.
18. Tim always **blames** his faults on the others.
19. My little girl enjoys **playing** with dolls.
20. Does he enjoy **going** jogging in your free time?
21. He prefers **going** to the cinema to renting a DVD.
22. We'd rather **pay** by credit card than **pay** in cash.
23. He likes staying at home better than **going** to the supermarket.
24. In 200 years people **will live** on Mars.
25. I think you **will be** a famous artist one day.
26. The ambulance **will come** here in 5 minutes.
27. If it rains today, we **will stop** the trip.
28. If he **gets** proper medical care, he will survive.
29. The drought **continues**, plants and animals will perish.
30. If I **study**, I **will pass** the exams.
31. Unless the sun **does not shine**, we'll walk into town.
32. My friends **were driving** to work when they heard the news on the radio.
33. He **was riding** his bicycle when the cat ran across the road.
34. My father sometimes **teaches** me to play chess.
35. Jane **goes** to school by bicycle every day.
36. The children **are playing** badminton in the stadium now.
37. The tourist lost his camera while he **was walking** around the city.
38. The lorry **was going** very fast when it hit our car.
39. I **was walking** down the street when it began to rain.
40. At this time last year, I **was attending** an English course.

Bài tập 2: Viết lại câu sử dụng từ cho trong ngoặc sao cho nghĩa không đổi:
1. Unless it rains tomorrow, we will stay at home.
2. Should Nam get the job, he can earn a lot of money.
3. If we don't hurry up, we'll miss the bus.
4. If you drink too much coffee, you will feel ill.