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考研英语:定语从句和同位语从句的三大区别

2014-04-17来源:文都教育

在考研英语的文章中,同位语从句和定语从句都放在被修饰词的后边,从形式上来看,它们十分相似,很多同学搞不清楚涉及到定语从句和同位语从句的相关知识点。为了减少大家在读文章时的相关障碍,老师现就同位语从句和定语从句的相关区别给大家做一个讲解。

(一) 连接词作用不同。

以that为例,连接定语从句的that一定会在从句中充当一定的成分;而连接同位语从句的that只起连接作用,不在从句中担任任何句子成分。whether 和 how 可以引导同位语从句,但不能引导定语从句。关系代词和关系副词除了连接从句的作用外,还在定语从句中充当一定的句子成分,如主语、宾语、定语、表语等。引导定语从句的连接词是关系词,常见的关系代词和关系副词有that , which , who , whose , whom , when , where , why , as,than, but等

The fact that we talked about is very important.

The fact that he succeeded in the experiment pleased everybody.

(二)先行词不同。

定语从句先行词既可以是人,也可以是物。相当于形容词。

The moon is a satellite that goes round the earth.

The few points that the president stressed in his report are very important.

同位语从句进一步说明的是具有抽象概念的词,其作用相当于名词,对前面的名词进行补充说明。如fact, result, discovery,belief , doubt , fact , hope , idea , news , possibility , thought , order , suggestion , wish , answer , information , conclusion , decision , discovery , knowledge , law , opinion , problem , promise , proof , question , report , truth , risk等等。

He has an idea that he can make the scientific instrument in a better way.

He expressed the hope that he would come to China.

(三)从引导词来看

如果引导从句的词为when表示时间,where表示地点,why表示原因,how怎么样,表示方式,而它前面的词分别表示时间,地点,原因,方式等意义,那它们就是关系副词,引导的是定语从句。

I’ll never forget the day when I saw the Great Wall.

This is the room where LuXun once lived.

The question when we will start the work is not decided.

You have no idea how worried I was.