1. Steven said if he had been Bill, he'd buy the house

- Câu gián tiếp thì QKĐ lùi thành QKHT

2. He asked Mai how many people there were in her class

- Câu gián tiếp dạng Wh-questions:

Form: S + asked sb/ wanted to know/ wondered + Wh/H + + S+V (lùi thì).

- Ở đây thì HTĐ ( are ) lùi thành QKĐ ( were )

- Đổi tính từ sở hữu your thành her

3. His mother reminded him to thank Mrs. Jones when he was saying goodbye to her

- remind sbd to V: nhắc nhở ai làm gì

- Vế sau lùi thì HTTD ( are saying ) thành QKTD ( was saying )

4. He thanked her for her help

- Thank sbd for sth: Cảm ơn ai vì điều gì

5. Letters were typed in the office by Mary

- Câu bị động thì Quá Khứ Đơn

- S + was/were + V3/ed + (by + O)

6. You will be helped by your father tommorrow

- Câu bị động thì Tương Lai Đơn

- S + will + be + V3/ed + (by + O)