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定语从句是高考英语最重要、考查最多的语法项目之一。多年来，笔者采用“五基”教学法，引导学生掌握定语从句用法，取得了良好的教学效果。
一、理解基本概念
（一）定语从句：在主从复合句中修饰某一名词、代词或修饰整个主句的从句叫定语从句。
（二）先行词：被定语从句所修饰的名词或代词叫先行词。
（三）关系代词/副词：连接先行词和定语从句的词叫关系词，根据其在从句中的作用分为关系代词和关系副词。若先行词在从句中作主语、宾语和定语等代词性功能，应当用关系代词引导定语从句;若先行词在从句中作时间状语、地点状语和原因状语等副词性功能，应当用关系副词引导定语从句。常见的关系代词有who， whom， whose， which， that， as;常见的关系副词有when， where， why。
二、引导学生熟悉基本用法
（一）关系代词基本用法（参看下表）：
注意：
1. 先行词在从句中作宾语时可用who代替whom。
Here is a girl who / whom I taught long ago.
2. 关系代词whom / which 均可作介词宾语，介词的位置可以放在从句中不及物动词后，也可将介词前置构成介词 + whom / which引导定语从句。
This is the girl （whom） I talked to yesterday.
This is the girl to whom I talked yesterday.
This is the book （which） he referred to then.
This is the book to which he referred then.
但下列情況下介词不能提前：
（1）用who代替whom， that代替which时介词不能提前。
误：He is the boy from who I learned to play volleyball.
误：Here is the parcel to that he sent Tom.
（2）当whom， which省去时介词不能提前。
误：Is he the boy with you went there？
误：This is the room in he lived.
（3）当whom， which作为含有介词的短语动词的宾语时，介词不能拆开提前。
误：You’re the very man for whom I’m looking.
误：This is the program to which he listened.
3. 先行词指物时，关系代词that和which可通用。但下列情况下只能用that，不能用which引导定语从句：
（1）先行词为everything， anything， nothing时。
Everything that can be done has been done.
（2）先行词为序数词或被序数词加以修饰时。
This is the first American film that I’ve ever seen.
（3）先行词为最高级或被最高级加以修饰时。
Is this the best book that you’ve ever read？
（4）先行词被all， little， much， some， any， no， every等词修饰时。
There is little work that I can do.
（5）先行词为all， little， much等词时。
All that can be done will be done.
（6）先行词被the only， the very， the same， the last等词修饰时。
This is the only book that I want to read.
（7）先行词既指人又指物时。
They talked about the persons and things that they remembered at school.
（8）当主句为以who或which开头的特殊疑问句时。
Who is the person that is standing there？
Which of us that knows something about physics doesn’t know this？
（9）若有两个定语从句，一个用which引导，另一个用须用that引导。
He bought a book which could give him knowledge and that could help to kill the time.
但下列情况下只能用which，不能用that引导定语从句：
（1）非限制性定语从句中。
He lives in Beijing， which is the capital of China.
（2）若有两个定语从句，一个用that，另一个须用which。
The book that he bought yesterday was the one which he liked best. 4. as也可作为关系代词引导定语从句
（1）用于the same…as…， such…as…， as…as…， so…as等结构中，常采用省略形式。此时as代表主句中用形容词the same， such或由副词as， so开始的整个名词短语，关系代词as在定语从句中作主语或宾语。
Here are such books as are helpful to you.
This is the same pen as I bought yesterday.
（2）引导属于附加说明性质的定语从句，先行词代表整个主句的内容，as从句常用逗号与主句隔开，as在从句中可作主语或宾语。
As we all know， Taiwan is a part of China. （As在从句中作宾语）
Taiwan is a part of China， as is known to all.（as在从句中作主语）
（二）关系副词基本用法（参看下表）：
注意：先行词虽表示时间、地点、原因，但在定语从句中不作时间、地点和原因状语而作主语或宾语，属于关系代词范畴，应当用关系代词that或which引导定语从句。
I regret the days （that / which） I wasted in the woods.
I’ll never forget 1976 which / that was full of sadness.
This is the factory that / which produces cars.
This is the factory （that / which） he visited yesterday.
This is the reason that / which is unreasonable.
This is the reason （that / which） he raised.
三、了解基本题型，掌握基本方法
所有定语从句的试题都可分成两种基本题型，它们有各自的解题方法。
（一）基本题型一及解题方法
基本题型一：先行词+关系词直接引导定语从句
解题方法：唯成分论
说明：用什么关系词直接引导定语从句，唯一取决于先行词在从句中的作用，即取决于先行词在从句中作什么成分。
例1：He passed the most difficult exam， __________ pleased his parents very much.
A. who B. which C. this D. what
析：B。先行詞为整个主句，在从句中作主语，所以应使用关系代词。但that不能引导非限制性定语从句，所以只能使用which。
例2：The old man often returns to the small town __________ he grew up as a child.
A. which B. where C. that D. when
析：B。先行词the small town表地点，在定语从句中作地点状语，所以应使用关系副词where。
区别：This is the small town __________ is often praised.
A. which B. where C. when D. who
析：A。先行词the small town仍表地点，但在从句中作主语，属关系代词范畴。
例3：I regret the days __________ I stayed in Beijing.
A. which B. when C. where D. that
析：B。先行词the days表时间， 在从句中作时间状语，属关系副词范畴。
区别于：I regret the days __________ I wasted in Beijing.
A. which B. when C. where D. who
析：A。先行词the days仍表时间， 但在从句中作宾语，属关系代词范畴。
（二）基本题型二及解题方法
基本题型二：先行词+特定词汇+关系代词which / whom引导定语从句
特定词汇通常为：
⒈介词（包括复杂介词），⒉数词（包括不定量数词）+ of，⒊其他词汇（表所属关系）+of。
解题方法：定语从句与先行词联系论
说明：要找出用什么特定词汇引导定语从句，方法是将定语从句和先行词联成一个完整的句子，此时缺什么词，特定词汇就由什么词担任。
例1：In the new class， she couldn’t find a single person __________ she could turn for help.
A. that B. who C. from whom D. to whom
析：D。根据定语从句与先行词联系论，可得到这样一个句子：She could turn to the single person for help.显然，该句缺介词to，因此应当用to whom（其先行词指人）引导定语从句。 例2：There are eight trees in my yard， most of __________ are very tall.
A. these B. those C. that D. which
析：D。根据定语从句与先行词联系论，可得到这样一个句子：Most of the eight trees are very tall. most of which 正体现了不定量数词+of which引导定语从句的特点。
例3：I had many friends， the tallest of __________ is Li Ping.
A. who B. whom C. that D. which
析：B。因为根据定语从句与先行词联系论，可得到这样一个句子：The tallest of the many friends is Li Ping.因此the tallest of whom正体现了其他词（表所属关系）+of whom引导定语从句的特点。
注意上述特定词汇前不能加and，but等连词，否则就不能使用定语从句，而应将whom，which 改成them。如：
I have many friends and the tallest of __________ is LiPing.
A. who B. whom C. them D. which
析：C。因为特定词汇the tallest前面有连词and，所以不能使用定语从句。
四、厘清基本关系
（一）内部关系
1. 关系代词与关系代词转换
whose + n = the + n + of whom / which
This is the boy whose parents / the parents of whom are party members.
2. 關系副词与关系代词转换
（1）where = in / on which
This is the room where / in which he lives.
（2）when = on / in / at which
I still remember the year when / in which I joined the Party.
（3）why = for which
This is the reason why / for which he was killed.
（二）外部关系
定语从句可与主语、宾语、表语或状语从句互换。
1. 定从与主从转换：（The place） where he lives in unknown to me.
2. 定从与宾从转换：I don’t know （the place） where the soil is rich.
3. 定从与表从转换：This is （the place） where he lives.
4. 定从与状从转换：I’ll go （to the place） where you go.
五、了解基本规律
（一）因先行词在从句中充当成分，定语从句中不能出现代替先行词的词。
误：This is the book which he lost it yesterday.（应去it）
（二）定语从句中不能缺少先行词。
Is this factory the one you visited？（the one不能省，也不能换成which或that）
（三）定语从句中不能缺少关系词。
误：The students study very hard are good students.（study前应加who或that）
责任编辑 张艳珺
一、理解基本概念
（一）定语从句：在主从复合句中修饰某一名词、代词或修饰整个主句的从句叫定语从句。
（二）先行词：被定语从句所修饰的名词或代词叫先行词。
（三）关系代词/副词：连接先行词和定语从句的词叫关系词，根据其在从句中的作用分为关系代词和关系副词。若先行词在从句中作主语、宾语和定语等代词性功能，应当用关系代词引导定语从句;若先行词在从句中作时间状语、地点状语和原因状语等副词性功能，应当用关系副词引导定语从句。常见的关系代词有who， whom， whose， which， that， as;常见的关系副词有when， where， why。
二、引导学生熟悉基本用法
（一）关系代词基本用法（参看下表）：
注意：
1. 先行词在从句中作宾语时可用who代替whom。
Here is a girl who / whom I taught long ago.
2. 关系代词whom / which 均可作介词宾语，介词的位置可以放在从句中不及物动词后，也可将介词前置构成介词 + whom / which引导定语从句。
This is the girl （whom） I talked to yesterday.
This is the girl to whom I talked yesterday.
This is the book （which） he referred to then.
This is the book to which he referred then.
但下列情況下介词不能提前：
（1）用who代替whom， that代替which时介词不能提前。
误：He is the boy from who I learned to play volleyball.
误：Here is the parcel to that he sent Tom.
（2）当whom， which省去时介词不能提前。
误：Is he the boy with you went there？
误：This is the room in he lived.
（3）当whom， which作为含有介词的短语动词的宾语时，介词不能拆开提前。
误：You’re the very man for whom I’m looking.
误：This is the program to which he listened.
3. 先行词指物时，关系代词that和which可通用。但下列情况下只能用that，不能用which引导定语从句：
（1）先行词为everything， anything， nothing时。
Everything that can be done has been done.
（2）先行词为序数词或被序数词加以修饰时。
This is the first American film that I’ve ever seen.
（3）先行词为最高级或被最高级加以修饰时。
Is this the best book that you’ve ever read？
（4）先行词被all， little， much， some， any， no， every等词修饰时。
There is little work that I can do.
（5）先行词为all， little， much等词时。
All that can be done will be done.
（6）先行词被the only， the very， the same， the last等词修饰时。
This is the only book that I want to read.
（7）先行词既指人又指物时。
They talked about the persons and things that they remembered at school.
（8）当主句为以who或which开头的特殊疑问句时。
Who is the person that is standing there？
Which of us that knows something about physics doesn’t know this？
（9）若有两个定语从句，一个用which引导，另一个用须用that引导。
He bought a book which could give him knowledge and that could help to kill the time.
但下列情况下只能用which，不能用that引导定语从句：
（1）非限制性定语从句中。
He lives in Beijing， which is the capital of China.
（2）若有两个定语从句，一个用that，另一个须用which。
The book that he bought yesterday was the one which he liked best. 4. as也可作为关系代词引导定语从句
（1）用于the same…as…， such…as…， as…as…， so…as等结构中，常采用省略形式。此时as代表主句中用形容词the same， such或由副词as， so开始的整个名词短语，关系代词as在定语从句中作主语或宾语。
Here are such books as are helpful to you.
This is the same pen as I bought yesterday.
（2）引导属于附加说明性质的定语从句，先行词代表整个主句的内容，as从句常用逗号与主句隔开，as在从句中可作主语或宾语。
As we all know， Taiwan is a part of China. （As在从句中作宾语）
Taiwan is a part of China， as is known to all.（as在从句中作主语）
（二）关系副词基本用法（参看下表）：
注意：先行词虽表示时间、地点、原因，但在定语从句中不作时间、地点和原因状语而作主语或宾语，属于关系代词范畴，应当用关系代词that或which引导定语从句。
I regret the days （that / which） I wasted in the woods.
I’ll never forget 1976 which / that was full of sadness.
This is the factory that / which produces cars.
This is the factory （that / which） he visited yesterday.
This is the reason that / which is unreasonable.
This is the reason （that / which） he raised.
三、了解基本题型，掌握基本方法
所有定语从句的试题都可分成两种基本题型，它们有各自的解题方法。
（一）基本题型一及解题方法
基本题型一：先行词+关系词直接引导定语从句
解题方法：唯成分论
说明：用什么关系词直接引导定语从句，唯一取决于先行词在从句中的作用，即取决于先行词在从句中作什么成分。
例1：He passed the most difficult exam， __________ pleased his parents very much.
A. who B. which C. this D. what
析：B。先行詞为整个主句，在从句中作主语，所以应使用关系代词。但that不能引导非限制性定语从句，所以只能使用which。
例2：The old man often returns to the small town __________ he grew up as a child.
A. which B. where C. that D. when
析：B。先行词the small town表地点，在定语从句中作地点状语，所以应使用关系副词where。
区别：This is the small town __________ is often praised.
A. which B. where C. when D. who
析：A。先行词the small town仍表地点，但在从句中作主语，属关系代词范畴。
例3：I regret the days __________ I stayed in Beijing.
A. which B. when C. where D. that
析：B。先行词the days表时间， 在从句中作时间状语，属关系副词范畴。
区别于：I regret the days __________ I wasted in Beijing.
A. which B. when C. where D. who
析：A。先行词the days仍表时间， 但在从句中作宾语，属关系代词范畴。
（二）基本题型二及解题方法
基本题型二：先行词+特定词汇+关系代词which / whom引导定语从句
特定词汇通常为：
⒈介词（包括复杂介词），⒉数词（包括不定量数词）+ of，⒊其他词汇（表所属关系）+of。
解题方法：定语从句与先行词联系论
说明：要找出用什么特定词汇引导定语从句，方法是将定语从句和先行词联成一个完整的句子，此时缺什么词，特定词汇就由什么词担任。
例1：In the new class， she couldn’t find a single person __________ she could turn for help.
A. that B. who C. from whom D. to whom
析：D。根据定语从句与先行词联系论，可得到这样一个句子：She could turn to the single person for help.显然，该句缺介词to，因此应当用to whom（其先行词指人）引导定语从句。 例2：There are eight trees in my yard， most of __________ are very tall.
A. these B. those C. that D. which
析：D。根据定语从句与先行词联系论，可得到这样一个句子：Most of the eight trees are very tall. most of which 正体现了不定量数词+of which引导定语从句的特点。
例3：I had many friends， the tallest of __________ is Li Ping.
A. who B. whom C. that D. which
析：B。因为根据定语从句与先行词联系论，可得到这样一个句子：The tallest of the many friends is Li Ping.因此the tallest of whom正体现了其他词（表所属关系）+of whom引导定语从句的特点。
注意上述特定词汇前不能加and，but等连词，否则就不能使用定语从句，而应将whom，which 改成them。如：
I have many friends and the tallest of __________ is LiPing.
A. who B. whom C. them D. which
析：C。因为特定词汇the tallest前面有连词and，所以不能使用定语从句。
四、厘清基本关系
（一）内部关系
1. 关系代词与关系代词转换
whose + n = the + n + of whom / which
This is the boy whose parents / the parents of whom are party members.
2. 關系副词与关系代词转换
（1）where = in / on which
This is the room where / in which he lives.
（2）when = on / in / at which
I still remember the year when / in which I joined the Party.
（3）why = for which
This is the reason why / for which he was killed.
（二）外部关系
定语从句可与主语、宾语、表语或状语从句互换。
1. 定从与主从转换：（The place） where he lives in unknown to me.
2. 定从与宾从转换：I don’t know （the place） where the soil is rich.
3. 定从与表从转换：This is （the place） where he lives.
4. 定从与状从转换：I’ll go （to the place） where you go.
五、了解基本规律
（一）因先行词在从句中充当成分，定语从句中不能出现代替先行词的词。
误：This is the book which he lost it yesterday.（应去it）
（二）定语从句中不能缺少先行词。
Is this factory the one you visited？（the one不能省，也不能换成which或that）
（三）定语从句中不能缺少关系词。
误：The students study very hard are good students.（study前应加who或that）
责任编辑 张艳珺