Giúp mk với Mk cảm ơn

=>
14. She asked me if I could help her.
-> câu tường thuật dạng Yes/No questions : asked sb if/whether S V(lùi thì, can -> could)
15. She asked me if I was working that night.
-> câu tường thuật dạng Yes/No questions : asked sb if/whether S V(lùi thì, HTTD -> QKTD)/ tonight -> that night
16. She asked me if I would come later.
-> câu tường thuật dạng Yes/No questions : asked sb if/whether S V(lùi thì, will -> would)
17. She asked me if I liked coffee.
-> câu tường thuật dạng Yes/No questions : asked sb if/whether S V(lùi thì, HTĐ -> QKĐ)
18. She asked me if that was the road to the station.
-> câu tường thuật dạng Yes/No questions : asked sb if/whether S V(lùi thì, HTĐ -> QKĐ)/ this -> that
19. She asked me if I had done my homework.
-> câu tường thuật dạng Yes/No questions : asked sb if/whether S V(lùi thì, QKĐ -> QKHT)
20. She asked me if I had studied reported speech before.
-> câu tường thuật dạng Yes/No questions : asked sb if/whether S V(lùi thì, HTHT -> QKHT)