6,They said that they had been in london the previous week 

->Gián tiếp của quá khứ đơn lluif thì thành quá khứ hoàn thanh

7,He said that he would have finished that paper by the next day

->gián tiếp của modal V

8,She said that she would apply for her visa the next day

->gián tiếp của modal V

9, Lan said that If she were me, she wouldn’t come here,”

-> gián tiếp của điều kiến loại 2,3 ko lùi thì như loại 1

=>

6. They said that they had been in London the week before.

-> câu tường thuật lùi thì QKĐ -> QKHT/ last week -> the week before/the previous week.

7. He said that he would have finished that paper by the following day.

-> câu tường thuật will -> would/ tomorrow -> the following day/the next day.

8. She said that she would apply for her visa the following day.

-> câu tường thuật will -> would/ tomorrow -> the following day/the next day.

9. Lan said that if she were me, she wouldn't come there.

-> câu tường thuật ở câu điều kiện loại 2 -> không lùi thì