$1.$ Not until $12$ did she finish her homework.

→ Đảo ngữ với not until: Not until + trợ động từ + S + V + that + O

Hoặc: Until/ till + Clause/ Adv of time + Auxiliary + S + V

$2.$ Not until $9$ does the boy go to bed.

$3.$ Not until he comes will I leave.

$4.$ Not until she was $7$ did my sister start school.

I. Sentence pattern

Cấu trúc đảo ngữ với not until (till) (mãi) cho đến đi/chỉ khi ... thì mới )

* NOT UNTIL + THỜI GIAN/ S1 + V1 + TRỢ ĐỘNG TỪ + S2 + V2

Lưu ý: khi thêm trở động từ (does, do, did (giữ nguyên) các trợ đông từ như was/were, has, have, had (chia thì đúng dạng của chúng), will, các modal verb (giữ nguyên)

He did not arrive home until ten. 

-> Not until ten did he arrive home.

1. She did not finish her homework until 12.

-> Mot until 12 did she finish her homework

2. The boy doesn’t go to bed until 9.

-> Not until 9 does the boy go to bed

3. I will not leave until he comes.

-> Not until he comes will I leave 

4. My sister did not start school until she was 7.

-> Not until she was 7 did my sister start school

Belive me I'm good at English