定语从句概念：一个句子跟在名词或者代词（也叫先行词）后进行修饰限定，就叫做定语从句。其实，从句在整个句子中做定语，这个从句就叫做定语从句。从句在主句中充当定语成分，被修饰的词叫做先行词。定语从句由关系词（也就是关系代词、关系副词）引导，关系词位于定语从句句首。
0102定语从句的分类01
定语从句其作用是作定语修饰主句的某个成分，定语从句分为限定性和非限定性从句两种。当先行词是专有名词或物主代词和指示代词所修饰时，其后的定语从句通常是非限制性的，非限制性定语从句还能将整个主句作为先行词,从句谓语动词用第三人称单数。
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定语从句公式： 定语从句=先行词+关系词+从句
End0102定语从句的关键词01
引导定语从句的关系词有关系代词和关系副词，常见的关系代词包括that， which， who(宾格whom，所有格whose)等，关系副词包括where， when， why等。关系代词和关系副词放在先行词及定语从句之间起连接作用，同时又作定语从句的重要成分。
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关系代词： 1.that和which that可代表事物也可代表人，which代表事物；它们在从句中作主语或宾语，that在从句中作宾语时常可省略关系词，which在从句中作宾语则不能省略。而且，如果which在从句中作“不及物动词＋介词”的介词的宾语，注意介词不要丢掉。 例子： Is he the man who/that wants to see you? 他就是你想见的人吗？（who/that在从句中作主语） He is the man whom/ that I saw yesterday. 他就是我昨天见的那个人。（whom/that在从句中作宾语） A prosperity which / that had never been seen before appears in the countryside. 农村出现了前所未有的繁荣。（which / that在句中作宾语） The package (which / that) you are carrying is about to come unwrapped. 你拿的包快散了。(which / that在句中作宾语 18.2 关系副词引导的定语从句 Attitudes towards daydreaming are changing in much the same way that(in which) attitudes towards night dreaming have changed. 人们对白日做梦的态度正在改变，这与人们对夜间做梦的看法的变化有非常相似之处。 I like the music for the very reason that(for which) he dislike it. 我出于某种原因喜欢这种音乐，而他恰恰与我相反。 We arrived the day that(on which) they left. 刚好我们到的那天他们走了。 Ocean currents affect the climates of the lands near which they flow. 洋流影响其流经的附近地区的气候。 2.who、whom和whose who和whom引导的从句用来修饰人，分别作从句中的主语和宾语，whom作宾语时，要注意它可以作动词的宾语也可以作介词的宾语。 例子： They rushed over to help the man whose car had broken down. 那人车坏了，大家都跑过去帮忙。 Please pass me the book whose (of which) cover is green. 请递给我那本绿皮的书。 3.where，when和why where是关系副词，用来表示地点的定语从句，when引导定语从句表示时间。 例子： There are occasions when (on which) one must yield. 任何人都有不得不屈服的时候。 Beijing is the place where (in which) I was born. 北京是我的出生地。 Is this the reason why (for which) he refused our offer? 这就是他拒绝我们帮助他的理由吗？ They explained the reason to us why they had hated us before. 他们向我们解释为什么他们不喜欢我们的原因。
End01实例判断01
判断改错 （错） This is the mountain village where I visited last year. （错） I will never forget the days when I spent in the countryside. （对） This is the mountain village (which) I visited last year. （对） I'll never forget the days (which) I spent in the countryside.
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