1. Trung said he would clean all the class windows.
2. Mr. and Mrs Bruce said they could come the next Monday.
3. She told me they didn't know me. 
4. I told her Jim was driving his car that day.
5. Ming told me he wouldn't be home that evening because he had to work late.
6. I said to Nam there wasn't any milk in that bottle.
7. Mai told Tuan she might visit him the next day.  
8. He said he had helped his mother with the housework. 
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- Lùi thì modal verbs: can -> could, will -> would, may -> might
- Lùi 1 thì của các V thường: HTĐ -> QKĐ, QKĐ -> QKHT, HTTD -> QKTD,...
- Chuyển ngôi các đại từ: he -> him, she -> her, tên người (tùy giới tính) -> he/she, you -> me/us,....
- Chuyển đổi các trạng từ: this -> that, here -> there, now -> then, tomorrow -> the next day/ the following day, ago -> before,...