=>
1. C was staying
2. D studied
3. B had been
4. D if/whether
5. A tomorrow -> the next day
6. D what that word meant
7. B was
8. C yesterday -> the day before
9. D if I was
10. C if I had seen
Câu tường thuật dạng Yes/No questions : asked sb if/whether S V(lùi thì)
Câu tường thuật dạng WH-questions : asked sb + từ để hỏi + S V(lùi thì)
Lùi thì trong câu tường thuật :
HTĐ -> QKĐ
HTHT -> QKHT
QKĐ -> QKHT
HTTD -> QKTD