1. "Will we be able to live on Saturn in the next decade?"

=> The little boy asked his mother_______to live on Saturn in the next decade

2. "Have humans been able to communicate with people on other planets?" 

=> Samuel asked the scientist___________to communicate with people on other planets

3. "Did the Roswell UFO incident take place in the U.S in June 1947?" 

=> Nick asked the journalist_______the Roswell UFO incident________in the US in June 1947

`1.` The little boy asked his mother if they would be able to live on Saturn in the next decade

`2` Samuel asked the scientist if humans had been able to communicate with people on other planets

`3` Nick asked the journalist if the Roswell UFO incident had taken place in the U.S. in June `1947`

`-` Cấu trúc :

`@` Câu tường thuật Yes/No questions:

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

`@` Câu tường thuật Wh-questions:

`-` S + asked/wondered/wanted to know + (O) + wh-word + S + V(lùi thì)

`@` Câu trần thuật

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

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`1` The little boy asked his mother if they would be able to live on Saturn in the next decade

we `->` they

will `->` would

`2` Samuel asked the scientist if humans had been able to communicate with people on other planets

have `->` had

`3` Nick asked the journalist if the Roswell UFO incident had taken place in the US in June 1947

did take `->` had taken

`->` Câu hỏi tường thuật dạng yes/no : S + asked + sb + if/whether + S + V-lùi thì