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状语从句的省略是什么意思
状语从句的省略是指使语言的精炼将状语从句进行简化。需满足两个条件: 主句和从句的主语一致，或从句主语为it；从句主要动词是be的某种形式。例举如下。
例句：When ( the museum is ) completed , the museum will be open to the public next year。
He’ll go to the seaside for his holiday if (it is ) possible。另外，比较状语从句经常省略。
状语从句的＂简化＂应用
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。下面针对这五种情形作一归纳。
状语从句的省略
状语从句的省略
1. 在when,whenever,while,until,as soon as等引导的时间状语从句中,可以省略与主句中主语相同的主语和系动词或助动词。
When (he was) a child he ran wild. 他小的时候很不守规矩。
They were scolded whenever (they were) late for school.每次上学迟到,他们都要挨骂。
While (he was) in prison,he wrote his first novel.他在狱中写出了第一部小说。
As soon as (I am) on board I always feel sick. 我一上船就感到恶心。
2. 在if,unless,once等引导的条件状语从句中。
If (it is) not well organized,the meeting will be a failure.如果组织不好,会议就会失败。
Substances have no tendency to expand unless(they are) heated.除非受热,物质不会有膨胀的倾向。
Once (she was) inside her bedroom,she began to cry. 一走进卧室,她就开始哭。
3. 在where,wherever引导的地点状语从句中,可以省略主语和系动词或助动词。
Through long power lines,electricity goes where (it is) needed.电通过输电线输送到需要它的地方去。
4. 在than,as引导的比较状语从句中。
She works better than I (works). 她工作做得比我好。
I'd rather play football than (I'd rather) go swimming. 与其去游泳我还不如去踢足球。
Run as fast as you can (run). 你能跑多快就跑多快。
5. 在“the+比较级,the+比较级”的句型中。
The greater the force of action (is),the greater the force of reaction (is).作用力越大,反作用力也越大。
6. 在whatever,however引导的让步状语从句中,可以省略系动词。
He was determined to carry out the plan,whatever the cost (was).他决心执行计划,不管代价如何。
However difficult the task (may be),we must finish it on time.不管这任务有多难,我们都必须按时完成。
when 引导的时间状语的省略用法
句子并不是越复杂越好，而是应该力求简洁，简化的方法之一就是把when 引导的时间状语从句改为一个现在分词短语（主动的动作）或过去分词短语（被动的动作）。例如（括号内是可以省略的部分）：
1. When (I am) helping others, I feel happy. 在帮助他人时，我感到快乐。
2. When (I am) asked to help others, I never hesitate. 在别人有求于我时，我从不犹豫。
如果when 引导的时间状语从句是一个“主系表”句型，则省略主语和系词：
3. When (it is) possible, people should use reproducible energy instead of fossil energy. 只要有可能，人们应该使用可再生能源以代替矿物能源。
4. When (it is) necessary, you can call me for help. 必要时你可以打电话找我求援。
如愿进一步探讨，欢迎发邮件至zhoushihong_cool@163.com。
状语从句的省略具体是怎样的句子
状语从句的省略
一般说来省略现象多出现在下列五种状语从句中：由 when ,while ,as ,before,after ,till,until,once等引导的时间状语从句；由whether ,if ,unless 等引导的条件状语从句；由 though ,although ,even if ,whatever等引导的让步状语从句；由 as ,than 等引导的比较状语从句；由as,as if ,as though 等引导的方式状语从句.上述状语从句在省略时,并非任何成分都可以省略而是遵循下面原则：
（1）当状语从句的主语与主句的主语一致时,可以省略状语从句的主语和系动词be ,这时从句中可出现如下结构：
① 连词（as,as if ,once）+ 名词
如：Once (he was)a worker ,Pang Long now becomes a famous singer .庞龙曾经是个工人,现在变成一位著名的歌手.
②连词（ though,whether ,when）+形容词
如：Work hard when (you are) young ,or you'll regret.趁年轻要努力学习,要不然你会后悔的.
③连词(whether,as if ,while )+介词短语
如：He looked everywhere as if (he was)in search of something .他到处看似乎在找什么东西.
④连词(when ,while ,though )+ 现在分词
如：While (he was) holding talks with President Hu Jintao ,US President George W.Bush thanked China for its important role in the Six-Party Talks.
⑤ 连词(when ,if ,even if ,unless ,once ,until,than ,as ) + 过去分词
如：The exhibition is more interesting than (it was) expected .这次展览比被预料的有趣的多
⑥ 连词(as if ,as though ) + 不定式
如：Olympic gold medallist hurdler Liu Xiang opened his lips as if (he were) to speak .奥林匹克金牌获得者跨栏运动员刘翔张开嘴好象要说什么.
（2）当从句的主语是 it,谓语动词中又含有系动词be 时 ,可以把it和系动词be一起省略.此时构成连词(if ,unless ,when ,whenever)+形容词的结构.如：Unless (it is) necessary ,you'd better not refer to the dictionary.如果没有必要,你最好不要查字典.
各种状语从句的省略现象列举如下：
一、时间状语从句中的省略
When (she was) very young,she began to learn to play the piano.她很小时,就开始学习弹钢琴.
While (I was) at college,I began to know him,a strange but able student.我在上大学时就开始认识他,一个奇怪但有能力的学生.
When arriving,send me a telegram.(When you arrive,send me a telegram.) 到达之后,来个电报.
Before leaving,turn off all the lights.(Before you leave,turn off all the lights.) 走之前,请关闭所有的灯.
Don’t come in until (you are) asked to.不叫你请你不要进来.
Whenever (it is )possible,you should come and help.不管什么时候只要有可能就来帮忙.
You should let us know the result as soon as(it is) possible.你应尽快让我们知道结果.
注：as在引导时间状语从句时,没有这种省略现象.我们不可说As walking,she found a nice shining thing on the ground.
二、地点状语从句中的省略
地点状语从句的省略常用下列结构：where(ver) possible,where(ver) necessary,
Lay these books where possible you can find them easily.把这些书放在你可能容易找到的地方.
Put in articles wherever necessary in the following passages.在下列文章中需要的地方填入冠词.
三、条件状语从句中的省略
常用的句型是：if necessary,if possible,if true,if anyone等.如：
Send the goods now if (they are) ready.货物如果准备好了,请送过来.
He will come if (he is) asked.如果叫他来,他就来.
If (it is) necessary,ring me at home.如果有可能,朝我家里打电话.
Come along with me if (it is) possible.如果有可能和我一起去吧..
If (it is) true,this will casue us a lot of trouble.如果是真的,这会给我们带来很多麻烦.
There are few people nowadays,if (there are) any,who remember him.很少有人能记起他.
You should stay where you are,unless (you are) asked to leave.你应呆在你现在的地方不动,除非叫你动.
四、让步状语从句中的省略
He is a good man,though sometimes (he is) rather dull.他真是个好人,尽管有时有点无聊.
Even if (I am ) invited to,I won’t go to such a bad lecture.即使邀我去,我都不想听如此坏的报告.
五、比较状语从句中的省略
She can play the piano just as wonderfully as you (do).她钢琴弹的我你弹的一样好.
She has finished the work earlier than (it has been ) expected.
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