定语从句是什么意思,who引导的定语从句什么意思？ _生活知识

定语从句(也称关系从句、形容词性从句)，在句子中做定语，用来修饰一个名词或代词（先行词），通过对词句进行补充、修饰、限定，进而使原句内容更完整。
如:She is the girl who likes singing. 她就是那个喜欢唱歌的女孩。
这就是一个定语从句。被定语从句修饰的名词"the girl"就是先行词。
定语从句不同于单词作定语的情况，它通常只能放在被修饰的词(即先行词)之后，由关系词（关系代词或关系副词）引出，关系代词、关系副词位于定语从句句首。
关系代词有：who, whom, whose, that, which等。
关系副词有：when,where,why

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由关系代词引导的从句：
1）who,%20whom,%20that
这些词代替的先行词是人的名词或代词，在从句中所起作用如下:
Eg.%20Is%20he%20the%20man%20who/that%20wants%20to%20know%20you？
他就是想认识你的人吗？（先行词the%20man，who/that%20在从句中做主语）
Eg.%20He%20is%20the%20man%20whom/%20that%20I%20saw%20yesterday.
他就是我昨天见的那个人。(先行词the%20man,%20whom/that在从句中作宾语)
2)%20Whose%20谁的，用来指人或物,%20若指物，还可以同of%20which互换，如:
He%20is%20the%20man%20whose%20opinion%20I%20respect.
他是我尊重其意见的人。
3)which,%20that
这些词代替的先行词是事物的名词或代词，在从句中作主语、宾语等，例如:
I%20lost%20the%20coat%20which/that%20I%20like%20most.
我弄丢了我最喜欢的外套。(先行词the%20coat,%20which%20/%20that在从句中作宾语)
I%20like%20the%20coat%20which/that%20is%20green%20most.
我最喜欢绿色的那间外套。(which%20/%20that%20在从句中作主语)
由关系副词引导的从句：
关系副词可代替的先行词是时间、地点或理由的名词，在从句中作状语。
1)when,%20where,why
关系副词when,%20where,%20why常常可用介词+%20which"结构交替使用.
eg.%20There%20are%20occasions%20when%20(on%20which)%20one%20must%20yield.
任何人都有不得不屈服的时候。
eg.%20Shanghai%20is%20the%20place%20where%20(in%20which)%20I%20graduated.
上海是我的毕业的地方。
eg.%20Is%20this%20the%20reason%20why%20(for%20which)%20he%20refused%20our%20offer?
这就是他拒绝我们帮助他的理由吗?
2)that代替关系副词
that可以用于表示时间、地点、方式、理由的名词后取代when,%20where,%20why和"介词+%20which"引导的定语从%20句，在非正式文体中that常被省略(正式文体中不可省略)，例如:
His%20grandpa%20died%20the%20year%20(that%20/%20when%20/%20in%20which)%20he%20was%20born.
他爷爷在他出生那年逝世了。
如何判断使用关系代词或关系副词？
方法一:%20看从句中的谓语动词。如果及物动词后面无宾语，就必须要求用关系代词。
例如:
(错)%20This%20is%20the%20place%20where%20I%20visited%20last%20year.
(对)%20This%20is%20the%20place%20%20(which)%20I%20visited%20last%20year.
(错)%20I%20will%20never%20forget%20the%20days%20when%20I%20spent%20with%20you.
(对)%20I'll%20never%20forget%20the%20days%20(which)%20I%20spent%20with%20you.
习惯上总把表地点或时间的名词与关系副词%20where,%20when联系在一起。此两题错在关系词的误用上。
方法二:%20准确判断先行词在定语从句中的成分(主、谓、宾、定、状)，也能正确选择出关系代词/关系副词.先行词在从句中作主、定、宾语时，应该用关系代词;先行词在从句中作状语时，应选择关系副词。
例如:
(对)Is%20this%20the%20place%20which%20you%20visited%20a%20few%20days%20ago?
(对)Is%20this%20the%20place%20where%20the%20exhibition%20was%20held?
解题技巧：
1.眼睛要尖，找先行词。
2.将先行词跟定语从句连成一句话。
3.判断合适的关系词。

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who引导的定语从句什么意思？
在定语从句中，who用作主语，在非正式文体中也可以作宾语，指人。
例句：
The girl who often helps me with my English is from England.经常在英语方面帮助我的那个女孩是英国人。
【定语从句是什么意思,who引导的定语从句什么意思？】这里who引导定语从句，指的是the girl