21. Lena said: "I enjoy chatting on the phone with my friends." 22. The teacher said: "A communication breakdown may happen due to cultural differences. 23. "What might the inhabitants of Jupiter look like?" Duong said. 24. Chau said: "Will we still have traffic jams in 30 years' time?" 25. "I've read a book about life on other planets," Phuc told me

Câu tường thuật - dạng câu kể 

S + said to / told + O + (that) + S + V (lùi thì)

S + said + (that) + S + V (lùi thì)

Câu tường thuật - dạng Yes/No-questions 

S + asked / wanted to know / wondered + (O) +if/whether + S+ V (lùi thì)

Câu tường thuật - dạng Wh-questions 

S + asked / wanted to know / wondered + (O) +WH + S+ V (lùi thì)

----------------------------------------------

HTĐ --> QKĐ

may --> might 

will --> would 

HTHT --> QKHT

----------------------------------------------

21. Lena said that she enjoyed chatting on the phone with her friends.

22. The teacher said that a communication breakdown might happen due to cultural differences.

23. Duong asked what the inhabitants of Jupiter might look like.

24. Chau asked if they would still have traffic jams in 30 years' time.

25. Phuc told me that he had read a book about life on other planets.

`color{orange}{~LeAiFuRuiHuiBao~}`

`21.` Lena said that she enjoyed chatting on the phone with her friends.

`-` Lùi thì: HTĐ `->` QKĐ

`22.` The teacher said that a communication breakdown might happen due to cultural differences.

`-` Lùi thì: may `->` might

`23.` Duong asked what the inhabitants of Jupiter might look like.

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

`24.` Chau asked if they would still have traffic jams in `30` years' time.

`-` Lùi thì: will `->` would

`25.` Phuc told me that he had read a book about life on other planets.

`-` Lùi thì: HTHT `->` QKHT

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

`@`Câu tường thuật:

`-` Kể: S + said (that) + S + V (lùi thì)

`-` WH question: S + asked sb + -wh question + S + V (lùi thì)

`-` Yes/no question: S + asked sb + if/whether + S + V (lùi thì)