不太理解，可以造个句子给我讲解下吗。
not until 引起的时间状语置于句首时，句子的主谓应部分倒装。由 not until 引导的时间状语从句位于句首时，主句应部分倒装，从句语序不变。如：
Not until 1998 did he return to his hometown.
直到 1998 年他才回到家乡.
Not until Father came back did we begin to have supper last night.
昨晚直到父亲回来,我们才开始吃晚饭.
扩展资料：
not until 最经典的结构是与 it was 的搭配，即 “it was not until .... that 从句”。
1、not until 后边一般是时间点，如：
It was not until 局毁midnight 昌举that it stopped raining. 直到半夜雨才停下来。
It was not until five o'clock in the afternoon that they finished their work. 直到下午五点他们才完成工作。
2、 not until 后边也可以是陈述的句子，如：
It was not until he came to China that he realized the great change in recent decades. 直到他来到中国，他才意识到最近几十年的巨大变化。
It was not until he got sick seriously that he realized the value of a healthy body. 直到他生耐腊碧重病，他才意识到一个健康体魄的价值。
3、 not until 后边还可跟介词短语，如：
It was not until after Friday that I got his reply. 直到星期五之后，我才得到他的答复。
Not until I saw the score did I realize I hadn't work hard.
直到我看到分蔽没陵数,我才意识到自己没有努力宏戚学习
I realized I hadn't work hard是主句察毕,倒装就成了did I realize ...
Not until I saw the score 是状语从句,不用倒装
典型例题
1) Why can't I smoke here?
At no time___ in the meeting-room
A. is smoking permitted B. smoking is permitted
C. smoking is it permitted D. does smoking permit
答案A. 这是一个倒装问题。当否定词语置于句首以表示强调时，其句耐数中的主谓须用倒辩亩弊装结构。 这些否定词包括no, little, hardly, seldom, never, not only, not until等。本题的正常语序是 Smoking is permitted in the meeting-room at no time.
2） Not until the early years of the 19th century ___ what heat is.
A. man did know B. man know C. didn't man know D. did man know
答案D. 看到Not until…的句型，我们知道为一倒装句，答案在C，D 中选一个。
改写为正常语序为，Man did not know what heat is until the early years of the 19th. 现在将not提前，后面就不能再用携族否定了,否则意思就变了。
not until置于轿拿衫句首时，句闭腔子要倒敏坦装语序
not until he explained it to me ,did I know the truth.