在考研路上英语复习中长难句一直是大家望尘莫及的一部分，其句子冗长结构复杂，理解起来非常有难度难度，需要考生对句子的结构和组成部分有深刻的理解。本期小编整理了考研英语语法难点之省略句的相关知识点整理，希望各位考研人在遇到长难句的时候有所帮助。
一．省略句的概念
为了句式简洁明了，更加突显上下文逻辑关系，根据具体结构省去某些句子成分，保持句意不发生改变，由此产生了省略结构。所谓省略，其本质就是省略重复的部分。总之英语中,为了避免重复,常常省略句子中的一个或几个成分,这样的句子叫省略句。
二．省略结构的处理
省略句,指说话写文章常省去一些不说自明的成分,从而达到语言的简洁。当我们遇到省略结构所要做的就是快速识别句子中省略的成分，然后补全省略成分。
例如:展望未来,我们对前景充满了信心。这是一个复句,由两个分句构成,前一个分句的主语蒙后省略,可根据后分句的主语补上“我们”。
三．省略句
1. 并列结构中的省略
a. 当并列连词后的句子同并列对象有 相同成分时，常常可以将并列连词后的句子中相同的成分省略；
b. 特别需要注意的是谓语动词的省略。
c. 主语的省略，连词的省略
1). Until these issues are resolved, a technology of behavior will continue to be rejected, and with it possibly the only way to solve our problems.
2). ...the peoples ... died out or became assimilated and lost their native languages.
3). It is said that in England death is pressing, in Canada inevitable and in California optional. Small wonder. Americans’ life expectancy has nearly doubled over the past century. Failing hips can be replaced, clinical depression controlled, cataracts removed in a 30-minutes surgical procedure.
2. 宾语从句省略引导词
宾语从句引导词省略现象是一种口语表达,宾语从句的引导词只有that可以省略.宾语从句中用that的前提有三点：一是从句本身表达出来的意思完整,这是可以通过不汉语角度去理解的；二是从句本身表达结构完整。

However, a comparison with data for weeks when there was no experimentation showed (that) output always went up on Monday.
3. 定语从句省略引导词
定语从句中引导词的省略大致可以归类为以下基本情况
a.关系代词作宾语时的省略
当关系代词who, whom, which和that在定语从句中用作动词宾语或介词位于句末时的介词宾语时,可以省略。
b.关系代词作表语时的省略,当关系代词that在定语从句中用作表语时,可以省略。
China is not the country it was.不是过去的了
c.关系代词作宾补时的省略,当关系代词that在定语从句中用作宾语补足时，可以省略。
I' m not the madman you thought me.我并不是你所认为的那个疯子。
d. 关系副词when的省略,用作时间状语的关系副词when通常不能省略,但有一种特殊情况,即用于day, year, time等少数几个词后时可以省略。
That was the day I first met you.就是那一天我一、次遇见你。
e. 关系副词where的省略,用作地点状语的关系副词where通常不能省略,但有一种特殊情况,即用于place, somewhere, anywhere, everywhere, nowhere少数几个词后时可以省略

This is the place ( where ) we met four years ago.这是我们四年前见面的地方。
f.关系副词why的省略,关系副词why通常只用于the reason后引导定语从句,且通常可换成that或for which ,均可省略。That' S the reason he came.这就是他来的原因。Give me one reason we should help you.给我举出一个我们应当帮助你的理由
The reason he was failed is easy to explain.他失败的原因很容易解释。
g. 当句首或句尾有who/there/here/that/it is /was时,作方语的关系代词可以省略。该情况主要用于口语。Who was it said so?谁那么说的?
This is the best part there is in this library.这是该图书馆————好的部分。
h.the way先行词在定语从句充当方式状语以及在定语从句充当宾语时,也可以省略。
I don't like the way she is talking to me.我不喜欢她和我说话的方式。
h. 在定语从句被动语态时,可以将定语从句关系代词和助动词be-起省略，只保留现过去分词。
The novels written by Lun Xun are very popular among the young people.
=The novels which were written by Lun Xun are very popular among the young people.
写的小说在年轻人当中很受欢迎。
4. 状语从句中的省略
用作状语的从句叫状语从句。状语从句可置于句首、句末或句中，一般来说，状语从句都比较完整。但是，在一些状语从句中存在的省略问题，可以归纳为以下两点：
1. when, while, if, as if, although / though, as, until, once, whether, unless, where等引导的从句中，如果其谓语为be，而主语与主句的主语相同时，则从句的主语和be可省略。有时从句的主语为it时，也可省略it或从句中的有关成分。

eg:If(it is) possible, this machine can be fixed at once.可能的话，这台机器会立即修好。
2. than, as, no matter what /who等后面成分的省略。
eg:We do not use more materials than (it is) necessary.我们不用过多的
5. 虚拟条件句中的省略
If的虚拟语气中的三种省略形式,当从句中含有were/should/had的形式时, If何以省略,但句子应为倒装形式,即were/should/had要提前置于句首。
1.过去的情况:
If we had found him earlier, we could have saved his life.= Had we found him earlier, we could have saved his life.
要是我们当时早点找到他的话,我们就可以救活他。
2.现在或将来的情况:
If she were here, she would attend the meeting too= Were she here, she would attend the meeting too.
如果她在这里,她也参加会议。
3.将来的情况:
If it should rain tomorrow, we should have to put off the meeting.= Should it rain tomorrow, we should have to put off the meeting.
若明天下雨，我们只好推迟会议。