$Answer:$

`1.` She asked her friend if/whether her friend believed that there was life on other planets.

`2.` Ha asked Hoa why she was looking into the sky.

`3.` He asked his brother if/whether he really saw a UFO the previous last night. 

`4.` She asked what they had said about the new telescope.

`5.` Lan asked Huong if/whether she had read the article about life on Mars.

`6.` They asked when the next space buggy would be sent to the moon.

`7.` Tom asked the presenter how and when the universe had been created.

`8.` Mai asked Dr.Taylor if/whether he was going to visit NASA the next Thursday.

`9.` Laura asked Ms.White if/whether she asked her some questions about other planets.

`10.` Nick asked me if/whether I wanted to travel to space one day.

$Explain:$

`@` Áp dụng cấu trúc:

S + asked + if/whether + S(chuyển ngôi nếu cần) + V(chuyển thì) + O...

S + asked + WH-question/How + S(chuyển ngôi nếu cần) + V(chuyển thì) + O...

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`1.`She asked her friend if her friend believed that there was life on other planets.

`-` Câu tường thuật dạng Yes or No questions.

`-` Cấu trúc: S + asked sb/wanted to know/... + if/whether + S + V lùi thì 

`-` Thì HTD `->` Thì QKD - lùi thì

  `2.`Ha asked Hoa why she was looking into the sky.

`-` Câu tường thuật dạng Wh-questions

`-` Cấu trúc: S + asked sb/wanted to know/... + Wh-questions + S + V lùi thì

`-` Thì HTTD `->` Thì QKTD - lùi thì

`-` Chủ ngữ "she" là chủ ngữ ngôi thứ `3` số ít `->` Đi với tobe "was" 

`3.`He asked his brother if he really saw a UFO the previous night.

`-` Thì HTD `->` Thì QKD

`-` last night `->` the previous night/the night before. 

`4.`She asked what they had said about the new telescope.

`-` Thì QKD `->` Thì QKHT - had VpII 

`5.`Lan asked Huong if she had read the article about life on Mars.

`-` Thì HTHT `->` Thì QKHT - had VpII 

`6.`They asked when the next space buggy would be sent to the moon.

`-` Thì TLD `->` would + V-inf + O

`-` Bị động thì TLD: will be VpII 

`7.`Tom asked the presenter how and when the universe had been created.

`-` Thì QKD `->` Thì QKHT 

`8.`Mai asked Dr.Taylor if he was going to visit NASA the next Thursday.

`-` Thì TLG `->` was/were + going to + V-inf

`-` next Thursday `->` the next Thurdays 

`9.`Laura asked Ms.White if she asked her some questions about other planets.

`-` Thì HTD (sau may là V-inf) `->` thì QKD 

`10.`Nick asked me if I wanted to travel to space one day. 

`-` Thì HTD `->` Thì QKD