2019高考进行备考阶段，考高分教育小编整理了2019高考英语语法：定语从句，供同学们参考。
2019高考英语语法：定语从句
1、功能：相当于形容词，修饰名词或代词，在句中作定语
2、位置：定语从句置于被修饰词之后
Those who are willing to attend the party, sign here please.
3、先行词：被定语从句修饰的词称为先行词
(1)先行词一般是名词和不定代词，如:some-, any-, every-和no与-boy, -thing的合成词;或all、none、any、some、that、those等代词。数词也可以作先行词，人称代词也同样可作先行词。
(2)先行词与关系词是等量关系。必须注意两点：
①先行词在从句中作主语时，从句谓语动词的数由先行词而定。
This is the place which is worth visiting.
②关系词在从句句子中充当了成分，其意思就是先行词的意义，所以在从句中不能重复其意。
There are many places we can visit(them)in China.
4、关系词：引导定语从句的都称关系词
关系代词：who, whom, which, that, whose, as。
关系副词：when, where, why。that偶尔也作关系副词。
5、确定关系词的步骤
(1)先找关系词，看先行词指的是什么。
(2)看关系词在从句中所充当的成分。
6、在定语从句中，当先行词指物时，下列情况的关系词宜用that而不用which
(1)先行词被①形容词较高级 ②序数词 ③数词几种词修饰或被 ④only、any、few、little、no、all、one of等修饰时。
(2)先行词为all、much、little、none、few、one、something、anything等不定代词时。
(3)先行词中既有人又有物时。
He was looking pleasantly at te children and parcels that filled his bus.
(4)先行词在主句中作表语关系词在从句中作表语时。
The village is no longer the one that was 5 years ago.
(5)当主句中含有疑问词which时。
Which are the books that you bought for me ?
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