例如:When you have finished your work, you may have a rest.
4、如从句表示"随时间推移",连词能用as,不用when 或while。
例如:As the day went on, the weather got worse.
日子一天天过去,天气越变越坏。
5、as, though 引导的倒装句
as / though引导的让步从句必须把表语或状语提前(形容词、副词、分词、实义动词提前)。句首名词不能带任何冠词。
如句首是实义动词,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。
例如:Child as /though he was, he knew what was the right thing to do.
= Though he was a small child, he knew what was the right thing to do.
Try hard as he will, he never seems able to do the work satisfactorily.
= Though he tries hard, he never seems…
虽然他尽了努力,但他的工作总做的不尽人意。
二、历届高考试题分析
例1、Generally speaking, _________ according to directions, the drug has no sid-effect.
A. when taking
B. when taken
C. when to take
D. when to be taken
答案为B。
【解析】
这是一个由when引导的时间状语从句,原句应为“Generally speaking ,when it is taken according…”。由于take用被动时,主从句主语一致,因此从句中的it was可以被省略,简化为when taken…分词短语作状语,而选A、C时则缺乏主语。译文:通常地说,当这药按照指导说明被服用的话是没有副作用的。
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