${1.}$ Lucia's mother asked her if she was at the sports center then.

${2.}$ Tom asked Mack what time he had come home the period night.

+) Dạng câu hỏi yes/no ( câu đầu ): S + asked +(O)/wanted to know/ wondered + if/whether + S + V(lùi thì)

+) Dạng câu hỏi wh/h ( câu sau ): S + asked +(O)/wanted to know/ wondered + 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

* Cách biến đổi trạng từ chỉ thời gian và nơi chốn:

- today → that day

- tonight → that night

- tomorrow → the next day/the following day

- yesterday → the day before/ the previous day/ the period day

- ago → before

- now → then

- this → that

- these → those

- here → there 

1. Lucia's mother asked her if she was at the sports center then.

2. Tom asked Mack what time he had come home the previous night.

- Câu gián tiếp:

+Dạng Yes/ No question: S1+ asked...+ if/ whether+ S2+ V(lùi thì)..

+Dạng Wh_question: S1+ asked...+ Wh_question+ S2+ V(lùi thì)...