同学你好,till和until都表示“直到……为止”,主句用延续性动词,主句和从句都用肯定式;表示“直到……才”时,主句用终止性动词,从句用肯定式,主句用否定式。
Go straight on until you come to the post office and then turn left. 一直向前走到邮局再向左转。
She won’t go away till you promise to help her. 在你答应帮助她之前,她不会走的。
而他们之间的区别在于:
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 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…
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