as, though引导的倒装句
as / though引导的让步从句必须将表语或状语提前 (形容词, 副词, 分词, 实义动词提前)。
注意:
1) 句首名词不能带任何冠词。
2) 句首是实义动词, 其他助动词放在主语后。如果实义动词有宾语和状语, 随实义动词一起放在主语之前。
Try hard as he will, he never seems able to do the work satisfactorily.
注意:
让步状语从句中,有though,although时,后面的主句不能有but,但是 though 和yet可连用。
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.
比较and和or
1) 并列结构中,or通常用于否定句,and用于肯定句。
2) 但有时and 也可用于否定句。请注意其不同特点:
There is no air or water in the moon.
There is no air and no water on the moon.
在否定中并列结构用or 连接,但含有两个否定词的句子实际被看作是肯定结构,因此要用and。
典型例题
---I don‘t like chicken ___ fish.
---I don‘t like chicken, ___ I like fish very much.
A. and; and B. and; but C. or; but D. or;and
答案C。否定句中表并列用or, but 表转折。
判断改错:
(错) We will die without air and water.
(错) We can‘t live without air or water.
(对) We will die without air or water.
(对) We can‘t live without air and water.