1。当Not until位于句首时,句子要倒装。其结构为：Not until+从句/表时间的词+助动词+(主句）主语+谓语+...。如: ①Not until the teacher came in did the students stop talking.直到老师进来学生们才停止讲话。 ②Not until next week will the sports meet be held。直到下周才开运动会。
not until we finished our work did he come
not until midnight did he return 2。 not until的强调结构为:It is / was not until+从句/表时间的词+that+。。.。上面两句改为强调句为: ③It was not until the teacher came in that the students stopped talking. ④It is not until next week that the sports meet will be held. 因此呢,现在的用法属于not until 的强调结构。这种用法很常见哦！
我在看关于部分倒装的教程时看到：“当not until引出主从复合句，主句倒装，从句不倒装。\"
不太理解，可以造个句子给我讲解下吗。
Not until I saw the score did I realize I hadn't work hard.
直到我看到分数,我才意识到自己没有努力学习
I realized I hadn’t work hard是主句,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，其句中的主谓须用倒装结构. 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，后面就不能再用否定了，否则意思就变了。
Not until he failed the exam__that working hard is important.
A> had he known B>did he know C〉he knew D>he had known
Not until 主语+谓语 +倒装结构（助动词提前)+主语+ 谓语 结构（主句倒装,从句不倒装）
Not until he failed the exam did he know that working hard is important
直到考试失败之后他才知道努力学习是很重要的
B.有以下例句：He didn’t go to sleep until his mother came back。
准确的说:Not until要放在一起并提前至句首。
其基本结构为：Not until + 状语（从句）+ 部分倒装的句子主干/主句(be/助动词/情态动词 + 主语 +。.。）
如：I didn't go to bed until 11:30 p.m。
倒装成：Not until 11：30 p。m。 did I go to bed。
再如：I didn’t leave until he returned.
倒装成：Not until he returned did l leave.
如果对你有所帮助，请点击我回答下面的“选为满意回答”按钮，谢谢！
追问：
谢谢~我刚刚看到一个句子：until the early 1970s, most archaeologists did not consider the coast a possible migration route into the Americans.。。
这里是这么回事啊？
回答：
楼主给的这个例句并非not。。.until。。.的倒装句型，它只是时间状语until。。.没有放在句尾，改放在句首而已。
其倒装句型为：Not until the early 1970s did most archaeologists consider the coast a possible migration route into the Americans.。.
