until,not until该怎么用...

until,not until该怎么用...

until / not...until之间的区别：
until“直到”,表示某一种行为一直持续到某一时间。用在肯定句中，句子的谓语动词必须是可延续性的。 not...until“直到...才”表示直到某一时间,某一行为才发生,之前该行为并没有发生. 用在否定句中，主句中的谓语可以是延续性的也可以是短暂性动词。
1. I studied Englis until 9 o'clock last night.
我咋晚学英语一直学到9点钟.(表示9点前一直在学)
2. I did not study Englis until 9 o'clock last night.
我咋晚直到9点钟才学英语.(表示9点才开始学)
3. I waited for five hours until it was dark. I had to give it up.
4. I didn't go to sleep until 11 o'clock
not until 还可以用于强调句中，也可以放在句首，句子要采用部分倒装
5. It was not until he came back that I went to sleep
6. Not until he came back did I go to sleep.

i sit here until he came back until与延续动词连用
he didn't leave until i came back not until 与短暂动词连用

i wait until he comes back. until 用于肯定句，前面是一个延续性动词
i didn't leave until he came back.not ...until 用于否定句，前面是一个非延续性动词

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