1. He said that he didn't know what had happened
(lùi thì: hiện tại đơn lùi về quá khứ đơn don't→didn't; quá khứ đơn lùi về quá khứ hoàn thành happened→had happened )
2. She said that she had gone to the doctor the previous day.
(lùi thì: quá khứ đơn lùi về quá khứ hoàn thành went→had gone; đổi yesterday thành the previous day)
3. He said that he had a toothache
(lùi thì: hiện tại đơn lùi về quá khứ đơn have→had)
4. She said that she would write him a precription.
(đổi trợ động từ will thành would)
5. They said that they were going to the drugstone.
(lùi thì: hiện tại tiếp diễn lùi về quá khứ tiếp diễn we are going → they were going)
6. He said that the doctor had given him some pills.
(lùi thì: quá khứ đơn lùi về quá khứ hoàn thành gave→had given)
7. She said that she went to the supermarket everyday.
(lùi thì: hiện tại đơn lùi về quá khứ đơn go→went)
8. He said that he had received the envelop.
(lùi thì: hiện tại hoàn thành lùi về quá khứ hoàn thành have received → had received )
9. They said that they had visited Cannery Row.
(lùi thì: quá khứ đơn lùi về quá khứ hoàn thành visited→had visited )
10. She said that she felt very sick.
(lùi thì: hiện tại đơn lùi về quá khứ đơn feel→felt)
11. He said that he had bought some popcorn.
(lùi thì: quá khứ đơn lùi về quá khứ hoàn thành bought→had bought)
12. They said that they were flying to California.
(lùi thì: hiện tại tiếp diễn lùi về quá khứ tiếp diễn are flying → were flying)
