`6.`  They wanted to know if/whether I knew where she could buy those Puma limited edition shoes. 

`-` Reported speech : Yes/No question

`-` Cấu trúc: S + asked + O + if/whether + S + V (lùi thì)

`-` Đổi đại từ: we `->` they

`-` Tính từ chỉ định: this `->`  that 

`-` can `->` could

`7.` Marta asked me why I hadn't done the work the boss had given me.

`-` Reported speech: Wh-question

`-` Cấu trúc: S + asked + Wh-question + S + V(lùi thì)

`-` Đổi đại từ: "you" `->` "I"

`-` Quá khứ đơn `->` Quá khứ hoàn thành

`8.` She wondered if/whether he had repaired the car himself or he had had someone else repair it.

`-` Reported speech : Yes/No question

`-` Cấu trúc: S + asked + O + if/whether + S + V (lùi thì)

`-` thì Quá Khứ đơn `->` Quá khứ hoàn thành

`9.` The police asked me where I had been when the number happened the night before.

`-` Reported speech: Wh-question

`-` Cấu trúc: S + asked + Wh-question + S + V(lùi thì)

`-` Đổi đại từ: you `->` I 

`-` last night `->` the night before/ the previous night

`-` Thì Quá khứ đơn `->` thì Quá khứ hoàn thành

`-` Động từ strong mệnh đề trạng ngữ chỉ thời gian "when the number happened" được chia ở thì QKĐ "happened" nên giữ khuyên.

`10.` Claire asked me if/whether that was my elder brother getting out of the taxi.

`-` Reported speech : Yes/No question

`-` Cấu trúc: S + asked + O + if/whether + S + V (lùi thì)

`-` Tính từ sở hữu: your `->` my

`-` Hiện tại đơn `->` quá khứ đơn

`11.` Emma asked if I had enough money to buy that apartment.

`-` Reported speech : Yes/No question

`-` Cấu trúc: S + asked + O + if/whether + S + V (lùi thì)

`-` Đổi đại từ: you `->` I

`-` Tính từ chỉ định: this `->` that

`-` Hiện tại đơn `->` Quá khứ đơn

`12.` The manager asked his secretary how many people would attend the meeting the next day.

`-` Reported speech: Wh-question

`-` Cấu trúc: S + asked + Wh-question + S + V(lùi thì)

`-` tomorrow `->` the next day/ the following day

`-` will `->` would

`13.` He asked me if/whether I had been to London before.

`-` Reported speech : Yes/No question

`-` Cấu trúc: S + asked + O + if/whether + S + V (lùi thì)

`-` Đổi đại từ: you `->` I

`-` Hiện tại hoàn thành `->` Quá khứ hoàn thành

`14.` She wondered which of those dresses suited her best for the party that night.

`-` Reported speech: Wh-question

`-` Cấu trúc: S + asked + Wh-question + S + V(lùi thì)

`-` me `->` her , these `->` those

`-` tonight `->` that night

`-` Thì HTĐ `->` Thì QKĐ

`15.` They asked the waiter if/whether he could tell the chef that they couldn't eat spicy foods.

`-` Reported speech : Yes/No question

`-` Cấu trúc: S + asked + O + if/whether + S + V (lùi thì)

`-` you `->` he, we `->` they

`-` Can `->` could , can't `->` couldn't

6."Can we touch the artifacts in this museum?" they wanted to know

→ They wanted to know if/whether they could touch the artifacts in that museum.
7."Why didn't you do the work the boss gave you?" Marta asked me.
→ Marta asked me why I hadn't done the work the boss had given me.
8."Did he repair the car himself or he had someone else repair it?" she wondered.

→ She wondered if he had repaired the car himself or he had had someone else repair it.
9."Where were you when the murder happened last night?” the police asked me.
→ The police asked me where I had been when the murder had happened last night.
10.“Is that your elder brother getting out of the taxi?" Claire asked me.
→ Claire asked me if that was my elder brother getting out of the taxi.
11.“Do you have enough money to buy this apartment?” Emma asked me.
→ Emma asked me if I had enough money to buy that apartment.
12."How many people will attend the meeting tomorrow?" the manager asked his secretary.
→ The manager asked his secretary how many people would attend the meeting the next day.
13."Have you been to London before?" he asked me.
→ He asked me if I had been to London before.
14."Which of these dresses suits me best for the party tonight?" she wondered.

→ She wondered which of those dresses suited her best for the party that night.
15."Can you tell the chef that we can't eat spicy foods?" they asked the waiter.

→ They asked the waiter if he could tell the chef that they couldn't eat spicy foods.

 * Công thức biến đổi câu trực tiếp ⇒ gián tiếp :

 - Command ( câu mệnh lệnh ) : 

        S+ asked/told+ O \(\left[ \begin{array}{l}to-V\\not +to-V\end{array} \right.\) 

 - Statement ( câu trần thuật ) :

        S+ said+(that)/said to+O/told+O  + S + V(lùi 1 thì)

 - Yes/No question :

        S+ asked+ O+if/whether+ S+ V( lùi 1 thì )

 - Wh_question :

        S+ asked+ O+ if/whether+ từ để hỏi + S+ V( lùi 1 thì )