`-` Câu tường thuật: Lời nói: S+ said+ to O+ ( that)+ SVO

                                 Yes/ No-question: S+ asked+ O+ if/ whether+ SVO

                                  Wh/ H-question: S+ asked+ O+ wh/ h-question+ SVO

`6`. She said to me ( that) she would do it if necessary she could.

`-` Đổi ngôi: I `->` she

`-` Động từ lùi thì: will `->` would, can `->` could

`7`. He asked his friend if/ whether she had seen the accident the previous day.

`-` Đổi ngôi: you `->` he/ she ( chưa rõ giới tính)

`-` Động từ lùi thì: did...see `->` had seen

`-` Trạng từ: yesterday `->` the previous day/ the day before 

`8`. John asked me how I had come there.

`-` Đổi ngôi: you `->` I

`-` Động từ lùi thì: did...come `->` had come

`-` Trạng từ: here `->` there

`9`. He asked Nam if/ whether he had finished his task.

`-` Đổi ngôi: you `->` he

`-` Động từ lùi thì: have finished`->` had finished

`-` Tính từ sở hữu: your `->` his

`-` Tường thuật :

`=>` S + said + that + S + V ( lùi thì )

`-` Tường thuật NV :

`+` Yes / No : S + asked + O + if / whether + S + V ( lùi thì )

`+` Wh : S + asked + O + wh + S + V ( lùi thì )

`-` QKĐ / HTHT `->` QKHT : S + had + VpII

`-` TLĐ `->` TLTQK : S + would + V

`-` Can `->` Could

`6`.He said to me that he would do it if necessary he could

`7`.He asked his friend if he had seen the accident the previous day

`8`.John asked me how I had come there

`9`.He asked Nam whether he had finished his task

`\text{# TF}`