高中英语如何选择定语从句的引导词

如何选择定语从句的引导词

*限制性定语从句

限制性定语从句修饰先行词，对先行词起修饰作用，紧接先行词之后，无逗号，若省去，原句意思不完整。引导定语从句的关系代词有who,whom,whose,which,that等。

who,whom,whose用于指人，whose有时也可指物，相当于of which；which用于指物；that 既可指人也可指物，但只用于限制性定语从句中。关系代词除了引导定语从句，替代先行词外，还在从句中担任主语、宾语、定语等。

*非限制性定语从句

非限制性定语从句既可修饰先行词，也可修饰整个主句，起补充说明作用，与主句之间有逗号隔开，若省去，原句意思不受影响。不可用that引导非限制性定语从句。关系词不可省略。

一、定语从句的引导词有关系代词who，whom，whose，which，that，as；关系副词when，where，why。定语从句中引导词的选用主要看先行词在定语从句中作什么成分或者是定语从句中缺什么成分。

1．定语从句中缺主语，修饰人时用who ／that，修饰物时用which ／that引导。如：

Is this the factory which ／that makes TV sets？

The man who ／that visited our school is from Australia．

2．从句中缺宾语，修饰人时用who ／whom ／that或省略引导词；修饰物时用which ／that或省略引导词。如：

Gone are the days which ／that we spent together in the village．

He is the man who ／whom ／that I think to be worthy of our praise．

3．从句中缺时间状语，用when或介词＋which引导。如：

The day finally came when ／on which I was given a job．

We'll put off the outing until next week，when we won't be so busy．

4．从句中缺地点状语，用where或介词＋which引导。如：

Please put the letter on the desk where ／on which he can easily find it．

5．从句中缺原因状语或先行词是reason时，引导词用why ／for which ／that。如：This is the reason why ／for which ／that he didn't come to the meeting．

6．从句中缺定语，人和物都用whose引导。如：

A child whose parents are dead is called an orphan．

Please pass me the dictionary whose cover is black．

7．当先行词是way时，其定语从句的引导词用in which ／that。如：

The way in which ／that he looks at problems is wrong．

二、引导词as可引导限制性定语从句，也可引导非限制性定语从句。

1．在固定词组the same．．．as，such．．．as中，as引导限制性定语从句。如：

He is not such a fool as he looks．

I've bought the same dress as she is wearing．

2．当先行词是整个主句时，可用as ／which引导非限制性定语从句。引导词as和which 的区别在于：

①as引导的非限制性定语从句可放于主句前、主句中、主句后，而which引导的非限制性定语从句一般放于主句后或句中。

②as常与从句中的know，see，hear，expect等动词连用，也常用于as often happens，as is often the case（常有的事）等句子中；而which一般不用于以上情况。

③as有“正如”的含义，which没有此含义。如：

As is well known，Shanghai is a big city．

Some of the roads were flooded，which made our journey more difficult．

三、关系代词who，whom，whose，which和as能引导非限制性定语从句，而that不能；非限制性定语从句中即使缺宾语，引导词也不能省略；关系副词when，where能引导非限制性定语从句，而why不能。如：

Abraham Lincoln，who led the United States through the Civil War years，was shot on April 14，1865．

四、先行词是物时，其引导词可用which也可用that，通常情况下二者可互换，但在有些情况下不能。

1．用which不用that引导定语从句的三种情况：

①非限制性定语从句用which，不用that引导。如：

Football，which is a very interesting game，is played all over the world．

②先行词为that时，为了避免重

复，定语从句用which不用that引导。如：

That which you borrowed from me wasn't a real diamond necklace．

③介词后用which不用that引导。如：

The method with which you solved the problem is very good．

2．用that不用which的七种情况：

①先行词前有形容词最高级或序数词修饰时，用that不用which引导。如：

This is the best place that I have ever visited．

The second question that is asked is why we don't fall off the earth．

②先行词为little，much，all，none，few，（the）one，something，everything，nothing，anything等不定代词时，用that引导。如：

There is nothing in the world that can frighten him．

③先行词既有指人的名词又有指物的名词时，用that引导。如：

He told us about the people and the cities that he had visited．

④先行词前有any，all，no，few，every，some，little，much，（the）very，（the）only，（the）last等词修饰时，用that引导。如：

This is the very coat that I need．

Is oxygen the only gas that helps fire burn？

⑤先行词为which时，为了避免重复，用that引导。如：

Which is the book that you bought yesterday？

⑥先行词在从句中作表语时，常用that引导。如：

Shanghai is no longer the city that it used to be in the 1930's．

⑦当主句是There be．．．句型时，用that引导。

There are two tickets for the film that are for you two．