【not until】notuntil的用法!

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【答案】 until 是直到.
　　如:You have to stand on it until you can go against it .
　　not until 是在...之前
　　如:You can not go against it until you can earn your life .
　　until一般不放在句首,后面跟时间词连用
　　如：He came back until midnight.
　　not until:可放句首,但主句要用倒装．
　　Not until midnight did he came back home.
　　还有一种用法与until相似．
　　He did not e back home until midnight.
　　until
　　prep.
　　(=to the time of)直到...时,到...为止
　　[常用在否定句中](=before)在...以前; 直到...才; 不到...(不)
　　until his death
　　直到他死
　　until four o'clock
　　直到四点钟
　　He did not go until night.
　　他直到夜里才走.
　　It was not until yesterday that I noticed it.
　　直到昨天我才注意到这件事.
　　两个不能说区别,因为not until本来就是until的否定,表示直到.才