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状语从句(第三章)
编辑:admin 时间:2012/10/7 20:29:00 来源:高中学习网

8 、比较 while, when, as

1)as, when 引导短暂性动作的动词。
Just as / Just when / When I stopped my car, a man came up to me.
2)当从句的动作发生于主句动作之前,只能用 when 引导这个从句,不可用 as 或 while 。
When you have finished your work, you may have a rest.
3)从句表示 "随时间推移" 连词能用 as ,不用 when 或 while 。
As the day went on, the weather got worse. 日子一天天过去,天气越变越坏。

9 、比较 until 和 till

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。
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 sets. )
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 stopped. 公共汽车停稳后再下车。
I didn't manage to do it until you had explained how. 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 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…

10 、表示 " 一 … 就 …" 的结构

hardly/scarcely…when/before, no sooner…than 和 as soon as 都可以表示 " 一 … 就 …" 的意思,例:
I had hardly / scarcely got home when it began to rain.
I had no sooner got home than it began to rain.
As soon as I got home, it began to rain.
注意:如果 hardly, scarcely 或 no sooner 置于句首,句子必须用倒装结构:
Hardly / Scarcely had I got home when it began to rain.
No sooner had I got home than it began to rain.


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