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一、not until的三种用法及例句
not...until的基本含义是直到...才,在...以前不。not...until的三种用法有:基本结构、强调句结构、倒装句结构。

二、not...until的基本结构

基本结构:not主句+until+从句
例句:
We did not get off the busuntil it stopped.
直到车停了,我们才下了公交车

三、not...until的倒装句结构

倒装句结构:Not until+从句+倒转的主句(主倒从不倒)
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。
例句:
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 lt night.
昨晚直到父亲回来,我们才开始吃晚饭.

四、not...until的强调句结构

强调句结构:It is / w not until+从句/表时间的词+that+主句
1、not until 后边一般是时间点,如:
It w not until midnight that it stopped raining. 直到半夜雨才停下来。
It w 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 w 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 w 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。
3、not until 后边还可跟介词短语,如:
It w not until after Friday that I got his reply. 直到星期五之后,我才得到他的答复。
我们可以注意到,在以上列举的例句中,“It is/w not until .... that 从句”句式中的“that 从句”部分都是采用一般的陈述语序(类似于宾语从句)。时态上一般采用过去时,与it w 相呼应。
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