* Cấu trúc câu gián tiếp:

- Dạng câu hỏi yes/no: S + asked +(O)/ wondered/wnated to know + if/wheter + S + V(lùi thì)

- Dạng câu hỏi wh/h: S + asked +(O)/ wondered/wnated to know +wh/h + S + V(lùi thì)

* Một số thì của động từ lùi thì:

- HTĐ → QKĐ

- HTTD → QKTD

- HTHT → QKHT

- HTHTTD → QKHTTD

- QKĐ → QKHT 

- QKTD → QKHTTD

- is/am/are going to → was/were going to

- can/ will/ shall/ may/ must + V0 → could/ would/ should/ might/ had to + V0

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${1.}$ Mum wanted to know if Peter had done his homework yet.

${2.}$ Mary asked Sue where she was going to spend her holiday that summer.

${3.}$ Tom asked me if I knew how long it was from London to Cambridge.

${4.}$ Cindy asked Carol if he would phone her as soon as he arrived in Oxford.

${5.}$ Grandma was interested in knowing if the children had played football in the park the day before.

${6.}$ Father wanted to know how much the ticket for the concert cost.

${7.}$ He asked Linda if she could help him with the housework the following day.

${8.}$ Terry asked what time the new TV series began that night.