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定语从句的概念定语从句（Attributive Clause）在句中做定语，修饰一个名词或代词，被修饰的名词，词组或代词即先行词。定语从句通常出现在先行词...

定语从句的概念定语从句（Attributive Clause）在句中做定语，修饰一个名词或代词，被修饰的名词，词组或代词即先行词。定语从句通常出现在先行词之后，由关系词（关系代词或关系副词）引出。关系代词和关系副词引导定语从句的关系代词有：who, whom, whose, that, which, as。注意：（1）as引导限制性定语从句时，通常用于下列结构：as we all know, as is known to all, as everyone can see, as has been said before, as might be expected, as is often the case等。as在非限制性定语从句中既可指人也可指物，通常用于下列句型：as is reported in the newspaper, as was shown in the experiment, as we can see from the graph, as has been proved by science等。（2）which引导非限制性定语从句时不可指代人，在从句中作主语、宾语或表语。作表语时，只能是the one which（that）。在非限制性定语从句中，不能用that，而用who, whom代表人，用which代表事物。引导定语从句的关系副词有：when, where, why。关系副词=介词+关系代词Why=for whichWhere=in/ at/ on/…+whichWhen=during/ on/ in/…+which关系代词引导的定语从句在从句中做主语（1）The boys who are playing football are from Class One.（2）Yesterday I helped an old man who lost his way.在定语从句中充当宾语，常可省略（1）Mr. Liu is the person （whom） you talked about on the bus.（2）Mr. Ling is just the boy whom I want to see.注意：关系代词whom在口语和非正式语体中常用who代替，可省略。（1）The man who/whom you met just now is our professor.（2）This is the man （whom/who/that） we saw this morning.也可指物，在定语从句中做定语（1）He has a friend whose father is a doctor.（2）I once lived in a house whose roof has fallen in.其先行词指物时，也可以用which的所有格形式。This is the book whose （which） cover is torn.请注意：（1）"whose"既可指人也可指物，只用作定语，有时它还可以代替of which。（2）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用that而不用who。相当于who或者whom；指物时，相当于which在定语从句中做主语或者宾语，做宾语时可省略。（1）The number of the people that/who come from the countryside is increasing.（2）The package （that/which） you are carrying is about to come unwrapped.（3）This is the only book that I have.（4）Mary likes music that is quiet and gentle.as 的用法（1）常用于下列结构：as we all know, as is known to all, as everyone can see, as has been said before, as might be expected, as is often the case等。（2）as引导非限制性定语从句时，可放在主句之前，或者主句之后，甚至可以切割一个主句；which引导的非限制性定语从句只能放在主句之后，不可以切割一个句子。关系副词引导的定语从句其先行词表示时间，在句中做时间状语（1）I still remember the day when I first came to the city.（2）The time when we got together finally came.其先行词表示地点，在句中做地点状语（1）This is the place where he used to live.（2）The city where I live is very beautiful.其先行词是原因，起原因状语作用（1）Please tell me the reason why you missed the plane.（2）I don't know the reason why he looks unhappy today.注意：关系副词引导的从句可以由“介词+关系代词”引导的从句替换。（1）The reason why/ for which he refused the invitation is not clear.（2）Fromthe year when/in which he was going to school, he began to know what he wanted to do when he grew up.限制性和非限制性定语从句限制性定语从句限制性定语从句与主句之间不用逗号隔开，语法结构和意义均完整。从句不可省去，如果省去整个句子的意思会不完整或发生改变。限制性定语从句修饰先行词，使先行词的具体内容更加明确。限制性定语从句只能修饰先行词，如果删去定语从句，原句的含义将会不完整或发生改变。限制性定语从句与先行词关系非常密切，所以不用逗号将主句与从句分开非限制性定语从句非限制性定语从句与主句之间通常用逗号隔开，起补充说明作用，如果省去，意思也基本完整。非限制性定语从句在形式上就与限制性定语从句有了明显的区别。它通常用逗号与主句分开，起补充说明作用，如果将其从句子中去掉，主句的意思仍然完整定语从句与其他从句的区别定语从句修饰名词或代词而名词性从句包括主语从句、宾语从句、表语从句和同位语从句，修饰整个句子状语从句包括时间、地点、原因、条件、结果、目的、让步和比较等从句修饰主句定语从句的省略关系代词作宾语时的省略：当关系代词who, whom, which和that在定语从句中用作宾语时，可以省略。例如：Is there anything （that） you wanted? 你想要点什么吗？定语从句与同位语从句的区别同位语从句说明名词的具体内容定语从句对名词进行修饰限定that在同位语从句中为从属连词不作成分，在定语从句中为关系代词，作主语、宾语或表语等同位语从句位于名词之后而定语从句位于名词之前定语从句的注意事项定语从句不能用wherewhen, why, whose, that或which等引导词来引导，而要用关系代词that来引导当先行词被形容词的最高级或序数词、不定代词、allevery, any, few, little, no, some等修饰时，关系代词常用that当先行词被the onlythe last, the same, the very等修饰时，关系代词常用that当先行词既有人又有物时关系代词常用that当关系代词在定语从句中作表语时关系代词常用that关系代词引导定语从句时在从句中作主语时一般用which，作宾语时一般用which或that，但在下列情况下，一般只用that而不用which（1）先行词为all, much, everything, nothing, anything等不定代词时。（2）先行词有the only, the last, the very等修饰时。（3）先行词为序数词、数词或形容词最高级时。（4）先行词既指人又指物时。（5）当关系代词在定语从句中作表语时。（6）为了避免重复或使句子结构紧凑时，常用that代替which来引导定语从句。如果定语从句为否定句，一般只用that而不用which以上是关于英语定语从句的详细讲解，包括关系代词和关系副词、限制性和非限制性定语从句、定语从句与其他从句的区别、定语从句的省略、注意事项等内容。掌握定语从句的用法和规则，对于提高英语阅读和写作能力都非常重要。希望这份讲解能够帮助你更好地理解和运用英语定语从句。