`6.` Val asked me if scientists had found life on Mars many years before.

`7.` Many people wondered if aliens of UFOs were real.

`8. `Sally asked her best friend if they could go to the National Museum the next day.

`9.` Duc asked Trang if he knew NASA had found two new planets.

`10.` She wanted to know if she had been there the previous day.

`@` Kiến thức câu gián tiếp :

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

`+` QKĐ `->` QKHT

`+` HTĐ `->` QKĐ

`+` HTHT `->` QKHT

`+` can `->` could

`+` ago `->` before 

`+` yesterday `->` the previous day

`+` tomorrow `->` the next day.

6. Vai asked me if scientists had found life on Mars many years before.

7. Many people wondered if aliens of UFO were real.

8. Sally asked her best friend if we could go to the National Museum the next day.

9. Duc asked Trang if he know NASA had found two new planets.

10.She wanted to know if she there had the next day