1. "How long did Neil Armstrong stay on the Moon?"

=> Alex asked his friend______Neil Armstrong_____on the Moon

2. "How was the universe created?" Tom asked the presenter

=> Tom asked the present______the universe_________

3. "What are artificial satellites used for?" we asked the scientist 

=> We asked the scientist______artificial satellites______for

`***` Câu tường thuật dạng câu hỏi Wh.

S + asked + O + wh + S + V(lùi thì)

`1.` Alex asked his friend how long Neil Armstrong stayed on the Moon.

`-` Lùi thì : HTD `->` QKD

`2.` Tom asked the presenter how the universe had been created.

`-` Lùi thì : QKD `->` QKHT

`-` Bị động HTHT : S + have/has + been + V-ed/c3 + ... + (by+O)

`-` Bị động QKHT : S + had + been + V-ed/c3 + ... + (by+O)

`3.` We asked the scientist what artificial satellites were used for.

`-` Lùi thì : HTD `->` QKD

`-` Bị động HTD : S + am/is/are + V-ed/c3 + ... + (by+O)

`-` Bị động QKD : S + was/were + V-ed/c3 + ... + (by+O)

`color{aqua}{\text{_ThuyLinh}}`

`1,` Alex asked his friend how long Neil Armstrong had stayed on the Moon.

- Lùi thì : QKĐ -> QKHT

`2,` Tom asked the presenter how the universe had been created.

- Lùi thì : QKĐ -> QKHT

`3,` We asked the scientist what artificial satellites were used for.

- Lùi thì : HTĐ -> QKĐ

- Câu tường thuật dạng Wh-questions : S + asked (O)/wondered/wanted to know + W.H + S + V(lùi thì) + O