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until ,till和not untill有什么区别?

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till 与until 什么时候可以互换,什么时候有不能
until ,till和not untill有什么区别?
解题思路: 注意特殊性即可。
解题过程:
1。做连词用。Until可用于句首,而till通常不用于句首。否定句常用until。
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。肯定句表示的意思是"做某事直至某时",动词必须是延续性的。
I slept until /till midnight. 我一直睡到半夜时醒了。
否定句表达的意思是"直至某时才做某事"。动词为延续性或非延续性都可以。时态特征为主将从现。
I didn't manage to do it until you had explained how.  直到你教我后,我才会做。
3。until和till可以作介词。作介词用时,后面接名词或副词;
They worked until / till six o”clock.
他们一直工作到六点钟。 4。注意特殊用法:倒装句及强调句
Not until the war was over was Einstein able to return to his homeland.
It was not until I called her from behind that she found me.
同学你好,很高兴为你答题,如有疑问请添加讨论。
最终答案:略