until ,till 和 not untill 的区别 (1)
till / until 在表达方式和意义上的特殊性： until 是 till 的强调 形式， 但是它们表达的意义是相同的， 都表示"直到某时" 。不过， 当 主句是否定句时，它引出的意思是 "直到(某时)(某动作)才(发 生) " ，这时候常会出现"not until „"的结构，如果将 "not until „"的结构放在句首，那么主句要写成倒装句。例如： He didn't go to sleep until 12 last night .
他昨晚直到十二点钟才睡觉。
They didn't realize their fault till we pointed it out to them . 直到我们向他们指出了他们的错误，他们才意识到。
Not until we pointed out their fault to them did they realize it .
直到我们向他们指出了他们的错误，他们才意识到。
但是，当主句是肯定句时，它引出的意思是 "直到(某时某动作停止 了) " 。例如：
The students made much noi till the teacher came into the classroom .
直到老师走进教室学生们才停止了大声喧哗。
The young couple were very happy until they ud up all their money .
那对年青夫妇直到花光了所有的钱才沮丧起来。焖羊排
另外， until 可以放在句首而 till 则不行。 我们可以说： Until they
ud up all their money, the young couple were very happy . 我们却不可以说： Till they ud up all their money, the young couple were very happy .
此两个连词意义相同。 肯定形式表示的意思是"做某事直至某时"， 动 词必须是延续性的。 否定形式表达的意思是"直至某时才做某事"。动 词为延续性或非延续性都可 以 。 正确使用这两个连词的关键之一就 在于判断句中的动词该用肯定式还是否定式。
肯定句：
I slept until midnight. 我一直睡到半夜时醒了。
芝士培根焗饭Wait till I call you. 等着我叫你。
(在肯定句中可用 before 代替 Let's get in the wheat before the sun ts. )
否定句：
She didn't arrive until 6 o'clock.
她直到 6 点才到。
Don't get off the bus until it has 小学二年级下册stopped.
公共汽车停稳后再下车。
I didn't manage to do it until you had explained how水瓶和射手. 直到你
教我后，我才会做。
1)Until 可用于句首，而 till 通常不用于句首。
Until you told me, I had heard nothing of what happened.
直到你告诉我以前，出了什么事我一点也不知道。
2)Until when 疑问句中， until 要放在句首。
---Until when are you staying? 你呆到什么时候？
--- Until next Monday. 呆到下周一。
注意：否定句可用另外两种句式表示。
(1)Not until „在句首，主句用倒装。
Not until the early years of the 19th century did man know what heat is.
直到 19 世纪初，人类才知道热能是什么。
Not until I began to work 安全注射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 is not until„ that„
until, not...until 的用法区别(2)
A. until 表示动作、状态的持续，强调“一直持续到„„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心德’t come.
* He去海南 lived with his parents until he graduated from college.
* He prepared his prentation slides until 2 am the next day.
小米手机开不开机他直到第二天凌晨两点才准备好他的讲义
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 noi 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.
* He didn't prepare his prentation slides until 2 am the next
day. 他直到第二天凌晨两点才开始准备他的讲义
