高一级英语定语从句讲解

高一级英语定语从句讲解
一、定语从句
1．定语从句三步：第一找出先行词；第二看先行词在定语从句中的语法功能（做主语、宾语或状语）；第三选择合适的关联词。

2．定语从句在选择关联词that 与which时，常常容易出错，所以应记住什么时候只能用that，什么时候只能用which.
（1）．只能用that 的情况归纳4种：即先得词被序数词最高级修饰过；先行词为all 、everything、nothing等不定代词；先行词同时是人和物并列时；最后先行词分别被the only 、the very the same、the last 修饰。

请看下列四组例句，注意其先行词：
①．The first thing that we should do is to work out a plan .
②．I t almost seemed as if the good man were trying to teach us all that he knew at this lesson .
③．Later my father and Mr. Crosset talked for about half an four of things and persons that they remembered in school.
④．This is the very dictionary that I want to find .
（2）．只用which is 情况有两种情况：一是非限制性定语从句，关联词要用which；二是做介词宾语时只能用which。

请看下列两组例句：
I said nothing , which made him more angry .
I have the book about which you are talking .
三、在定语从句的非限制性定语中，which 和as 是容易混淆的。

在很多情况下两者兼可互换，但在下列情况中不可互换：
1、通常As 可以放在整句的句首，而which，只能在逗号之后，as 本身含有“正如”，as 在定语从句中既可是主语也可做宾语
As appear from her paper ,she has read widely in Romantic literature.
She is remarkable, as I have told you .
2、which 在做非限制性定语从句关联词时可以无明确先行词，指前句整个的意思，如：She has married again, which surprises us .
四、在定语从句中，许多人往往分不清all that 和what, what 实际上只引导名词性从句，它相当于all that两个字，例如：
All that I know is that he has made up his mind to heave the country for a new place.
= what I know is that ……
定语从句
知识要点：
一、限定性定语从句：
注：先行词是time, minute, moment, next tim 很少用关系副词when,
可用that 但通常省去。

（2）非限制性定语从句
（3）限制性定语从句与非限制性定语从句的区别。