1. Nien asked Hoa if she had many new friends.

2. My friend asked me if I was going to leave the following day.

3. They asked me if I had to go now. 

* S + asked/wanted to know .... if/whether + S + V (lùi 1 thì )    ( với dạng yes/no questions) 

* Câu tường thuật thì phải lùi thì, thay đổi đại từ nhân xưng cho phù hợp, chuyển đổi từ chỉ nơi chốn và thời gian ( tomorrow -> the next day, here -> there ... )

1 Nien asked Hoa: "Do you have many new friends? "

-> Nien asked Hoa if she had many new friends.

2 My friend said: " Are you going to leave tomorrow? "

-> My friend asked if I was going to leave the next day.

3 They said to me: " Must you go now? "

-> They asked me if I had to go then.