16. John said, “I have finished studying my lesson”.  17. Mary said, “I can not go to the movies with you, John”.  18. “I shall expect to see you next Wednesday.” Mary said to her friend.  19. He said, “I don’t know what happened.”  20. She said, “I went to the doctor yesterday.”  21. He said, “I have a toothache.”  22. She said, “I’ll write him a prescription.”  23. They said, “We’re going to the drugstore.”  24. He said, “The doctor gave me some pills.”  25. She said, “I go to the supermarket every day.”  26. He said, “I have received the envelope.”  27. They said, “We visited Cannery Row.”  28. She said, “I feel very sick.”  29. He said, “I bought some popcorn.”  30. They said, “We’re flying to California.”  31. He said, “I’m cutting off the main valve.”  32. Nam said, “my uncle often plants the vegetables in the afternoon.”  33. “My uncle will not plant the vegetables tomorrow afternoon”, she said.  34. “Mr and Mrs Pike have just read these newspapers”, Nga said.  35. She said, “I often listen to music at night.”  36. Lan’s mother said, “My daughter usually brushes her teeth before meals.”  37. They said, “We have to do the assignments now.”  38. Lan says, “My sister seldom rides a bike to school.”  39. They said, “Our teacher sometimes explains the difficult lesson.”

=>

16. John said that he had finished studying his lesson.

17. Mary said to John that she could not go to the movies with him.

18. Mary said to her friend that she should/could expect to see her the following Wednesday.

19. He said that he didn't know what had happened.

20. She said that she had gone to the doctor the day before.

21. He said that he had a toothache.

22. She said that she would write him a prescription.

23. They said that they were doing to the drugstore.

24. He said that the doctor had given him some pills.

25. She said that she went to the supermarket every day.

26. He saidd that he had received the envelope.

27. They said that they had visited Cannery Row.

28. She said that she felt very sick.

29. He said that he had bought some popcorn.

30. They said that they were flying to California.

31. He said that he was cutting off the main valve.

32. Nam said that his uncle often planted the vegetables in the afternoon.

33. She said that her uncle wouldn't plant the vegetables in the next day afternoon/ the next afternoon.

34. Nga said that Mr and Mrs Pike had just read those newspapers.

35. She said that she often listened to music at night.

36. Lan's mother said that her dauughter usually brushed her teeth before meals.

37. They said they had to do the assignments then.

38. Lan says her sister seldom rides a bike to school. 

39. They said that their teacher sometimes explained the difficult lesson.

Câu tường thuật -> lùi thì

HTĐ -> QKĐ

HTTD -> QKTD

HTHT -> QKHT

QKĐ -> QKHT

Will -> Would

Shall -> Should

says (không lùi thì)