=>
6. My teacher asked me what aspect of learning English I found most difficult.
7. My friends asked me what time my classes began.
8. Bình asked Giang when she had come the previous night.
9. Minh asked Nga if her sons were reading the books in her room.
10. Tom asked Bao who had given him the laptop.
Câu tường thuật dạng Wh-questions : asked sb + từ để hỏi + S V (lùi thì)
Lùi thì trong câu tường thuật :
HTĐ -> QKĐ
QKĐ -> QKHT
HTTD -> QKTD