18, They said that they hadn’t had enough time, so they hadn’t studied that exercise carefully.

=> Câu gián tiếp lùi thì từ quá khứ đơn -> quá khứ hoàn thành.

19, He said that he was doing his homework then and he could go out with me.

=> Câu gián tiếp lùi thì từ hiện tại tiếp diễn -> quá khứ tiếp diễn.

20, She said that that was the best music she had ever heard.

=> Câu gián tiếp lùi thì từ hiện tại đơn -> quá khứ đơn.

21, The student said that he came from England and he had been there for two weeks.

=> Câu gián tiếp lùi thì từ hiện tại đơn -> quá khứ đơn.

22, She said that although she had been very busy and she had come to Tom’s birthday party.

=> Câu gián tiếp lùi thì từ quá khứ đơn -> quá khứ hoàn thành.

23, Ann said that she hadn’t attended the meeting the previous Monday and she had been very ill.

=> Câu gián tiếp lùi thì từ quá khứ đơn -> quá khứ hoàn thành.

24, Pete said that they would have a test the following week, so he was studying for it then.

=> Câu gián tiếp lùi thì: tương lai đơn -> quá khứ đơn; hiện tại tiếp diễn -> quá khứ tiếp diễn; will -> would; “next week” -> the following week.

25, She said that if I concentrated, I would understand that lesson well.

=> Câu gián tiếp lùi thì từ hiện tại đơn -> quá khứ đơn.