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not…until是一个短语，用来表示某事将不会发生，直到一个特定的时间或事件。not…until通常与非延续性动词连用，当其位于句首时，句子要倒装。
not…until的用法有哪些
not until的倒装与强调结构，not until通常与非延续性动词连用，强调主句所表示的状态或情景从until所表示的时间才发生，主句必须是否定句。
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。
Not until the teacher came in did the students stop talking.
直到老师进来学生们才停止讲话。
2、not until的强调结构为：It is/was not until+从句/表时间的词+that。
It was not until the teacher came in that the students stopped talking.
直到老师进来了，学生们才停止了说话。
not until的例句
1、Not until I began to work did I realize how much time I had wasted.
直到我开始工作,我才认识到了我已蹉跎了几多岁月.
2、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。
3、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。
4、It was not until he got sick seriously that he realized the value of a healthy body. 直到他生重病，他才意识到一个健康体魄的价值。