状语从句的"省略"常存在于以下五种状语从句中:①由if, unless等引导的
条件状语从句;②由although, though, even if / though等引导的让步状语从句;③由when, while, as, before, after, until / till等引导的
时间状语从句;④由as, as if等引导的
方式状语从句;⑤由as, than等引导的
比较状语从句。
总结如下
(1)当状语从句的主语是it,且
谓语动词是be时,it和be要完全简化掉。例如:
If (it is) possible, he will help you out of the difficulty.
如果可能的话,他会帮你摆脱困境。
You must attend the meeting unless (it is) inconvenient to you。
除非情况对你来说不方便,否则你必须出席这次会议。
(2)当状语从句的主语和主句的主语一致时,从句可以将主语和
be动词简化掉。常用于以下几种情形:
连词+形容词
As (he was) young, he learned how to ride a bike.
他小时候就学会了骑自行车。
Whenever (she is) free, she often goes shopping.
她有空就去逛商店。
Work hard when (you are) young, or you'll regret.
少壮不努力,老大徒伤悲。
连词+名词
While (he was) a young boy, he was always ready to help others.
他在孩子时代就乐于助人。
Although (he was) a farmer, now he is a famous director.
尽管他曾是个农民,但现在他是位著名的导演了。
连词+现在分词
As (she was) walking along the river bank, she was singing a pop song.
她沿着河堤边走边唱着
流行歌曲。
Although (he is) doing his best in maths these days, he has still got no good marks.
尽管近来他一直在学数学,但他仍然没有取得好成绩。
连词+过去分词
He won't go there with us unless (he is) invited.
除非受到邀请,否则他不会和我们一道去那里。
The concert was a great success than (it was) expected
.这场音乐会出乎意料地取得了巨大成功。
连词+不定式
He stood up as if (he were) to say something.
当时他站起来好像要说什么。
He wouldn't solve the problem even if (he were) to take charge.
即使他来负责,他也解决不了这个问题。
连词+介词短语
She looked anxious as though (she was) in trouble.
她看上去很焦急,好像遇到了麻烦。
He had mastered the English language before (he was) in the USA.
他到美国之前就懂英语了。
注意:当从句主语和主句主语不一致时,从句部分要么用完全形式,要么用
独立主格结构来表达。例如:
When the meeting was over, all the people went out of the meeting-room.
当会议结束时,人们都走出了会议室。(=The meeting over）