* câu gián tiếp dạng câu hỏi yes/no: S + asked + (O) + if/wheter + 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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${2.}$ Hang asked Nam if he liked sports.

${3.}$ She asked Nam if his sister and brother went to the same school.

${4.}$ She asked her mom if there were some oranges in the fridge.

${5.}$ He asked his friend if it would rain the following day.

${6.}$ Tam asked Peter if he had gone to Hue three years before.

${7.}$ Tuan asked Lan if Tam and Hoa were late for class.

${8.}$ She asked me if I could speak Chinese.

${9.}$ Tam asked Thu if she would be there for five days.

${10.}$ She asked Ba if he had been reading that book at 8 o'clock the period Sunday.