高中定语从句讲解及试题练习(5)

　　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。

　　区别：1)until可用于句首，而till通常不用于句首。例如：

　　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。例如：

　　---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。例如：

　　Not until the early years of the 19th century did man know what heat is. 直到19 世纪初，人类才知道热为何物。

　　Not until I began to work did I realize how much time I had wasted. 直到工作，才认识到我已蹉跎了几多岁月。

　　2)It is not until… that… 。例如：

　　It was not until I began to work that I realized how much time I had wasted.

　　19.10 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。例如：

　　I had hardly / scarcely got home when it began to rain. 刚回家，就下起雨来了。

　　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。例如：

　　Hardly / Scarcely had I got home when it began to rain.

　　No sooner had I got home than it began to rain.