6. My sister told me that she'd never been there before.

(lùi thì: HTHT ⇒ QKHT, "here"⇒ "there")

7. They told us they had bought that house a few years before.

(lùi thì: QKĐ ⇒ QKHT, "this" ⇒ "that", "ago"⇒ "before")

8. He said he had been watching TV at 8 the previous night.

(lùi thì: QKTD ⇒ QKHTTD, "last night" ⇒ "the night before")

9. He said he had to finish that report by the following week.

(lùi thì: "must" ⇒ "had to", "this"⇒ "that", "next week" ⇒ "the following week")

10. Mrs. Brown told her son that he had to explain all those things.

(lùi thì: "have to" ⇒ "had to", "these" ⇒ "those")

11. Mai said she had gone with her friends the day before.

(lùi thì: QKĐ ⇒ QKHT, "my" ⇒ "her" (vì Mai là con gái :)), "yesterday" ⇒ "the day before")

12. Minh told Lan he wanted to visit her countryside that Sunday.

(lùi thì: "want" ⇒ "wanted", "your" ⇒ "her" vì dịch nghĩa là quê hương của Lan mà Lan là con gái :), "this" ⇒ "that")

13. His brother said he could repair the bicycle himself.

(lùi modal verb: can ⇒ could, "myself" ⇒ "himself")

14. Nam told me that his uncle had just brought home a cute puppy.

("my" ⇒ "his", lùi thì: HTHT ⇒ QKHT)

15. Hoa said to her mom that she liked swimming there.

(lùi thì: HTĐ ⇒ QKĐ)

16. He told me that his father was a doctor there.

(lùi thì: HTĐ ⇒ QKĐ)