giúp tớ với ạ...................

`6.` Hoa said that she might visit her parents in that summer.

`-` Lùi thì: may `->` might

`-` ĐTCĐ: this `->` that

`7.` The teacher said that they could collect old book for the poor children.

`-` Lùi thì: can `->` could

`8.` She said she didn't but that book.

`-` Lùi thì: HTĐ `->` QKĐ

`-` ĐTCĐ: this `->` that

`9.` The students said they had to try their best to got good marks.

`-` Lùi thì: HTĐ `->` QKĐ

`10.` Lan said to Nam that he was the most intelligent student in their class.

`-` Lùi thì: HTĐ `->` QKĐ

`11.` My father told me that he had watched that documentary film many years before.

`-` Lùi thì: QKĐ `->` QKHT

`-` TTCTG: ago `->` before

`12.` He said he would go to school by bus the next day.

`-` Lùi thì: will `->` would

`-` TTCTG: tomorrow `->` the next day

`13.` Phong told his sister that she should learn more vocabulary.

`-` Lùi thì: should `->` should (không đổi)

`------------`

`@`Câu tường thuật

`-` Kể: S + said to sb/told sb/said + (that) + S + V (lùi thì)