13.She asked me if i had been to paris
14.She asked me if i could help her
15.She asked me if i was working that night 
16.She asked me if i would come later
17.She asked me if i liked coffee
18.She asked me if that the road was to the station
19.She asked me if l did my homework every day
20.She asked me if l had studied reported speech before
Cấu trúc: S+asked sb/wondered/wanted to know+if/whether+S+V(lùi 1 thì)

=>
13. She asked me if I had been to Paris.
14. She asked me if I could help her.
15. She asked me if I was working that night.
16. She asked me if I would come later.
17. She asked me if I liked coffee.
18. She asked me if that was the road to the station.
19. She asked me if I had done my homework.
20. She asked me if I had studied reported speech before.
Câu tường thuật dạng Yes/No questions : asked sb if S V(lùi thì)
Lùi thì trong câu tường thuật :
HTĐ -> QKĐ
HTTD -> QKTD
Will -> Would
QKĐ -> QKHT
HTHT -> QKHT
Can -> Could