`=>` It was not until he was 3 that Giong said some words.

`=>` Not until he was 3 did Giong say some words.

- It + to be + not until + time/ S + V + (that) + S + V 

- Đảo ngữ : Not until + time/ S + V + trợ động từ + S + V 

`**` Mệnh đề đảo ngữ trong quá khứ đơn : did + S + V nguyên thể

- "any" dùng trong câu phủ định, nghi vấn; "some" dùng trong câu khẳng định.

$-$ It was not until he was 3 (y/o) that Giong said some words.

`@` It $+$ was/were $+$ NOT $+$ until $+$ S $+$ tobe $+$ O

$-$ Not until he was 3 (y/o) did Giong say some words.

`@` NOT $+$ until $+$ S $+$ was/were $+$ O

`***` until : cho đến khi

$+$ Giong nói rằng anh ấy không nói được lời nào cho đến khi lên 3 (tuổi)

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