`10.` His friend asked him how he went to the airport.

`-` Lùi thì: HTĐ `->` QKĐ

`-` Đổi ngôi: You `->` He

`11.` Tuan asked Lan if Tam and Hoa were late for class.

`-` Lùi thì: HTĐ `->` QKĐ

`12.` She asked me if I needed an umbrella to go out.

`-` Lùi thì: Need `->` Needed

`-` Đổi ngôi: You `->` I

`13.` Thu asked Long if Lan's mother worked for a bank.

`-` Lùi thì: HTĐ `->` QKĐ

`14.` She asked me if I could speak Chinese.

`-` Lùi thì: Can `->` Could

`-` Đổi ngôi: You `->` I

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

`-` Cấu trúc câu gián tiếp với câu hỏi có chứa từ hỏi Wh-q:

`->` S `+` asked/wanted to know/wondered `+` Wh-q `+` S `+` V(lùi thì)

`-` Cấu trúc câu gián tiếp với câu hỏi nghi vấn Yes/No question:

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

`10` .His friend asked him how i went to the airport 

`->` lùi thì : HTĐ `->` QKĐ

`11` .Tuan asked whether Tam and Hoa were late for class

`->` lùi thì : HTĐ `->` QKĐ

`12` .She asked me if I needed an umbrella to go out

`->` lùi thì : HTĐ `->` QKĐ

`->` need `+` to V : cần làm gì

`13` .Thu asked Long if Lan's mother worked for a bank 

`->` lùi thì : HTĐ `->` QKĐ

`14` .She asked if I could speak Chinese 

`->` lùi thì : can `->` could

`->` could `+` V-inf: có thể làm gì

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

 `->` trần thuật câu hỏi:

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

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