1. She asked Nam if his sister and brother went to the same school.
→ S + asked + O + if/whether + S + V(lùi thì): câu gián tiếp dạng câu hỏi yes/no
2. Nam said (that) he was told to be at school before 7 o'clock.
→ S + said (that) + S + V(lùi thì)
3. Phong asked Peter if he enjoyed reading.
→ câu gián tiếp dạng câu hỏi yes/no
* Một số thì của động từ lùi thì:
- HTĐ → QKĐ
- HTTD → QKTD
- HTHT → QKHT
- HTHTTD → QKHTTD
- QKĐ → QKHT
- QKTD → QKHTTD
- can/will/shall/may/must + V0 → could/would/should/might/had to + V0