not until 和not unless，not until 什么意思

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unless是除非的意思，多用于条件状语从句。而。not。until是说直到。才跟楼上是一样的但我要扩展一下，就是用于非延续动词。而keepwait等延续性动词是不用于这类的句型的。还有当not在句首是要引起一个部分倒装，这也是考试中的一个考点。希望对你有所帮助，如果你对部分倒装没概念的话还是在网上搜索下吧

1.选C的话得用that he had seen

因为证人看见那个人相当证人陈述来说，是过去发生的事，应该用过去完成时

2. 虚拟语气助动词提前是相对于主句来说的，而条件从句应保持原先的语序不变

牢记，虚拟语气需要变语序的只是主句，其余只需按原先顺序照搬就成

If /条件从句this university didn't have such a good reputation/,（I would not have come here.主句）

而且hasn't（助动词）后只能加原形have，直接把b、d否了。

not … until,until

A.until表示动作、状态的持续,强调“一直到……为止”,或强调某个动作或状态一直持续到另一个动作或状态出现之前.常与表示延续性动作的动词连用.

如：* I waited until three o’clock,but he didn’t come.* He lived with his parents until he graduated from college.

B.not … until表示“到……为止；直到……才”,常与表示瞬间性动作的动词连用.

如：* The noise of the street didn’t stop until midnight.* The children didn’t come home until it was dark.* I didn’t know the truth until you told me.until 和not …until的区别

1. until 要与延续性动词连用，not…until 要与非延续性动词连用

2. until 句子翻译成动作直到…时候才结束，not…until句子要翻译成动作直到…时候才开始。

i slept until 12 o'clock.

我睡觉睡到12点。

we didn't get down to working until ms zhang came in.

我们直到张老师进来才开始认真的工作。

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 come 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

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