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什么是定语从句,有哪些特征.引导词可以是什么?什么时候In which可以替换that 这类的相关语法知识.

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什么是定语从句,有哪些特征.引导词可以是什么?什么时候In which可以替换that 这类的相关语法知识.
建议还是买一本语法书~`
定语从句相当于形容词,修饰名词或代词,句中作定语.定语从句置于被修饰词之后.
例:she is the girl who sings best of all.(她是所有人中唱歌最好的那个小女孩)
*句中的引导词为who,代替先行词the girl在句中作主语.从句是who sings best of all
先行词:被定语从句修饰的词称为先行词
关系词:引导定语从句的都称关系词
在定语从句中,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.
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#形容词最高级#序数词#数词几种词修饰或被#only,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 the 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主语时.
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?
whose作关系词既指人又指物,在从句中作定语.如:
1You know Mr.Smith whose story is very moving?
2There is a room,whose window faces the river,
3There is a room,the window of which faces the river.