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首先解释一下在定语从句中引导词前面的词叫先行词,先行词为名词或为代词的是定语从句。
例：Theboywho wonthe competition is Tom
在此句中boy为先行词，who为引导词，主句为两部分1.the boy
2 is Tom
且定语从句没有固定的时态（如宾语从句的主过从过），主要是根据句意或遵哪弯桐循主从句李坦时态一致。
在定闹者语从句中从句是修饰先行词的。
定语从句（Attributive Clauses）在句中做定语，修饰一个名词或代词，被修饰的名词,词槐穗组或代词即先行词。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。
关系代词有：who, whom, whose, that, which等。
关系副词有：when, where, why等。
1.关系代词引导的定语从句
关系代词所代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分。关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。
1）who, whom, that
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：
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）
2) Whose 用来指人或物，(只铅腔卜用作定语, 若指物，它还可以同of which互换）, 例如：
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）which, that
它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等，例如：
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）
2.关系副词引导的定语从句
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, where, why
关系副词when, where, why的含义相当于"介词+ which"结构，因此常常和"介词+ which"结构交替使用，例如：
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？
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, where, why和"介词+ which"引导的定语从句，在口语中that常被省略，例如：
His father died the year (that / when / in which) he was born. 他父亲在他出生那年逝世了。
He is unlikely to find the place (that / where / in which) he lived forty years ago. 他不大可能找到他四十年前居住过的地方。
3.断关系代词与关系副词
方法一： 用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词；而不及物动词则要求用关系副词。例如：
This is the mountain village where I stayed last year.
I'll never forget the days when I worked together with you.
判断改错（圆运注：先显示题，再显示答案，横线；用不同的颜色表示 出。）
（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.
习惯上总把表地点或时间的名词与关系副词 where, when联系在一起。此两题错在关系词的误用上。
方法二： 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。
例1. Is this museum ___ you visited a few days age?
A. where B. that C. on which D. the one
例2. Is this the museum ____ the exhibition was held.
A. where B. that C. on which D. the one
答案：例1 D，例2 A
例1变为肯定句： This museum is ___ you visited a few days ago.
例2变为肯定句： This is the museum ___ the exhibition was held.
在句1中，所缺部分为宾语，而where, that, on which都不能起到宾语的作用，只有the one既做了主句的表语，又可做从句的宾语，可以省略关系代词，所以应选D。
而句2中, 主、谓、宾俱全，从句部分为句子的状语表地点，既可用副词where，又因 in the museum词组，可用介词in + which 引导地点状语。而此题中，介词on 用的不对，所以选A。
关系词的选择依据在从句中所做的成分，先行词在从句中做主、定、宾语时，选择关系代词 (who, whom, that, which, whose)； 先行词在从句中做状语时，应选择关系副词 ( where 地点状语，when 时间状语，why 原因状语) 。
4.制性和非限制性定语从句
1) 定语从句有限制性和非限制性两种。限制性定语从句是先行词不可缺少的部分，去掉它主句意思往往不明确；非限制性定语从句是先行词的附加说明，去掉了也不会影响主句的意思，它与主句之间通常用逗号分开，例如：
This is the house which we bought last month. 这是我们上个月买的那幢房子。（限制性）
The house, which we bought last month, is very nice.这幢房子很漂亮，是我们上个月买的。（非限制性）
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是非限制性的，例如：
Charles Smith, who was my former teacher, retired last year. 查理�6�1史密斯去年退休了，他曾经是我的老师。
My house, which I bought last year, has got a lovely garden. 我去年买的的那幢房子带着个漂亮的花园。
This novel, which I have read three times, is very touching. 这本很动人，我已经读了三遍。
3) 非限制性定语从句还能将整个主句作为先行词, 对其进行修饰, 这时从句谓语动词要用第三人称单数，例如：
He seems not to have grasped what I meant, which greatly upsets me. 他似乎没抓住我的意思，这使我心烦。
Liquid water changes to vapor, which is called evaporation. 液态水变为蒸汽，这就叫做蒸发。
说明：关系代词that和关系副词why不能引导非限制性定语从句。
5.词+关系词 P>
1）介词后面的关系词不能省略。
2）that前不能有介词。
3） 某些在从句中充当时间，地点或原因状语的"介词+关系词"结构可以同关系副词when 和where 互换。
This is the house in which I lived two years ago.
This is the house where I lived two years ago.
Do you remember the day on which you joined our club?
Do you remember the day when you joined our club?
6.as, which 非限定性定语从句
由as, which 引导的非限定性定语从句，as和which可代整个主句，相当于and this或and that。As一般放在句首，which在句中。
As we know, smoking is harmful to one's health.
The sun heats the earth, which is very important to us.
典型例题
1）Alice received an invitation from her boss, ___came as a surprise.
A. it B. that C. which D. he
答案C. 此为非限定性从句，不能用 that修饰，而用which.，it 和he 都使后句成为句子，两个独立的句子不能单以逗号连接。况且选he句意不通。
2）The weather turned out to be very good, ___ was more than we could expect.
A. what B. which C. that D. it
答案B。which可代替句子，用于非限定性定语从句，而what不可。That 不能用于非限定性定语从句，it不为连词，使由逗号连接的两个句子并在一起在英语语法上行不通。
3）It rained hard yesterday, ____ prevented me from going to the park..
A. that B. which C. as D. it
答案B.
as 和which在引导非限制性定语从句时，这两个关系代词都指主句所表达的整个意思，且在定语从句中都可以作主语和宾语。但不同之处主要有两点：
(1） as 引导的定语从句可置于句首，而which不可。
(2） as 代表前面的整个主句并在从句中作主语时，从句中的谓语必须是系动词；若为行为动词，则从句中的关系代词只能用which.。
在本题中，prevent由于是行为动词，所以正确选项应为B。
As 的用法
例1. the same… as；such…as 中的as 是一种固定结构, 和……一样……。
I have got into the same trouble as he (has).
例2. as可引导非限制性从句，常带有'正如'。
As we know, smoking is harmful to one's health.
As is know, smoking is harmful to one's health.
As是关系代词。例1中的as作know的宾语；例2中，它充当从句的主语，谓语动词know要用被动式。
7.行词和关系词二合一
1)Whoever spits in public will be punished here.
(Whoever 可以用 anyone who 代替)
2)The parents will use what they have to send their son to technical school.
(what 可以用all that代替)
8.hat/whatever;that/what; who/whoever
1）what = the thing which；whatever = anything
What you want has been sent here.
Whatever you want makes no difference to me.
2) who= the person that whoever= anyone who
（错）Who breaks the law will be punished.
（错）Whoever robbed the bank is not clear.
（对）Whoever breaks the law will be punished.
（对）Who robbed the bank is not clear.
3) that 和 what
当that引导定语从句时 ，通常用作关系代词，而引导名词性从句时，是个不充当任何成分的连接词。宾语从句和表语从句中的that常可省略。What只能引导名词性从 句， 用作连接代词，作从句的具体成分，且不能省略。
I think (that) you will like the stamps.
What we need is more practice.
9.关系代词that 的用法
1）不用that的情况
a) 在引导非限定性定语从句时。
(错) The tree, that is four hundred years old, is very famous here.
b) 介词后不能用。
We depend on the land from which we get our food.
We depend on the land that/which we get our food from.
2) 只能用that作为定语从句的关系代词的情况
a) 在there be 句型中，只用that，不用which。
b) 在不定代词，如：anything, nothing, the one, all, much, few, any, little等作先行词时，只用that，不用which。
c) 先行词有the only, the very修饰时，只用that。
d) 先行词为序数词、数词、形容词最高级时，只用that。.
e) 先行词既有人，又有物时。
举例：
All that is needed is a supply of oil.
所需的只是供油问题。
Finally, the thief handed everything that he had stolen to the police.
那贼最终把偷的全部东西交给了警察。
我整理的，你看下：
（一） 定早握语从句
一，关系代词，关系副词，先行词及在句子中做的成分
关系代词
先行词
在从句中的作用
who
人
主语，宾语
whom
人
宾语
whose
人
做定语
that
人/事物
主语，宾语
which
事物
主语，宾语
关系副词
先行词
在从句中的作用
where
表示地点的名词
地点状语
when
表示时间的名词
时间状语
why
reason
原因状语
二，关系代词与关系副词的使用
1， 关系代词在从句中做谓语动词宾语时可省略，其他情况不能省略。
e.g：The words（that）he said were not easily forgotten
2，whose即可指人，也可指物。
e.g：The trees whose leaves were red were cut down
3，先行词是all，everything，nothing，something，anything，little，much，few，many，none等不定代词；
或者先行词被all, every, no, some, any, little, much等修饰时，指物的关系代词只能用 that。
1， 先行词被the only, the very, the last或者形容词最高级、序数词修饰时，或者先行御睁埋词同时含有人和物时，
关系代词用that
4，当先行词是指人的不定代词everyone, someone, no one, anyone, everybody, somebody, nobody, anybody，关系代词只能用who，不能用that。
5，主句是以who，which开头的特殊疑问句时，关系代词只能用that。Who is the man that you spoke to?
5，关系代词前有介词时，只能用which，不能用that。e.g:I’m looking for a box in which I can put all these things.
6，非限制性定语从句，先行词与关系词要用逗号分开。非限制性定语从句不能用 that（用which）和why（用for which）
三，定语从句中的主谓一致
1，定语从句中的关系代词如果做在从句中做主语，那么从镇蚂句中的谓语动词的单复数形式要与先行词保持一致。
e.g：The man who is playing basketball is my PE teacher.
Is there anything thatto you？A that is belonged B that belong C that belongsD which belongs
2，当先行词是one of +可数名词复数时，从句谓语动词用复数。而先行词是the/the very/the only/the right one of+可数名词复数时，从句谓语动词用单数。
e.g：He is one of the students who have won the first prize.
He is the one of the students who has won the first prize.
Tom was the only one of the boys who was on time.
四，定语从句关系代词与关系副词的选择方法
根据定语从句中缺少的句子成分来判定，如果缺少主、宾、表、定语，则使用关系代词；如果缺少状语，则使用关系副词。句子成分的判定，可以借助定语从句中的谓语动词或者非谓语动词是否是及物动词来辅助判定。
e.g：This is the company which I visited last year（visit后缺少宾语，因为visit是及物动词，用关系代词）
This is the company where he used to work.(从句不缺成分，work是不及物动词，用关系副词）
Is this the book which you found in the house?(found后少宾语，found是及物动词，用关系代词）
Is this the park where the exhibition was held?(从句不缺成分，用关系副词）
五，定语从句中“介词+关系代词”的用法
定语从句中的部分“不及物动词+介词”词组中的介词可以可以放在关系代词前面，这样的关系代词有which、whose、whom，但不能用that和who。
e.g：The teacher for whom you are waiting is coming.
This is the camera with which Tom often takes photos.
This is the soldier by whom my son was saved.
但有些词组不能拆分，不能有此用法。这样的词组有，hear of，look for,look after,care for, deal with,send for
一、概说
定语从句即辩蔽指在主从复合句用作定语的从句。定语从句通常修饰名词或代词，对它进行限制、描绘和说明。受定语从句修饰的词语叫先行词，引导定语从句的词语叫关系词。关系词按其性质又分关系代词和关系副词。根据从句与主句关系的紧密程度，定语从句又分为限制性定语从句和非限制性定语从句。
二、关系词的用法
关系词根据其性质可分为关系代词和关系副词。关系代词主要有
that,
who,
whom,
whose,
which,
as
等，其中
who
和
whom
只用于指人，which和
as
只用于指事物，whose
和
that
既可于指人也可用于指物，它们在定语从句可用作主语、宾语、表语或定语；关系副词主要有
when,
where
和
why，其中
when
表示时间，where
表地点，why
表原因，喊灶腊它们在定语从句中均用作状语。如：
This
is
the
book
(which)
you
want.
这就是你要的那本书。
There
are
a
lot
of
things
that
are
wrong.
有很多错的东西。
This
is
the
town
where
I
was
born.
这就是我出生的城市。
These
are
the
reasons
why
we
do
it.
这些就是我们这样做的原因。
三、关系词的选择
1.
一看先行词的意义，即分清先行词是指人、指物、时间、地点还是原因，如指物时不能用who或whom，指人时通常不用which等。
2.
二看关系词的句法功能，即分清关系词是担任什么句子成分，是作主语还是宾语、是作定语还是状语等，如作定语通常用whose，有时也用which；作状语要用when,
where,
why。注意，不要一看到先行词为表时间、地点、原因的名词，就认为一定要用
when,
where,
why
来引导定语从句，要注意分清它们在定语从句充当什么成分。如：
I
forget
the
time
when
he
will
come.
我忘记了他来的时间。(when
引导定语从句，在定语从句中用作状语)
I
forget
the
time
that
he
told
me.
我忘记了他告诉我的时间。(that
引导定语从句，在定语从郑滑句中用作宾语)
The
reason
why
he
can’t
come
is
that
he
is
ill.
他不能来的原因是他病了。(why
引导定语从句，在定语从句中用作状语)
The
reason
that
he
told
me
is
not
true.
他告诉我的原因不真实。(that
引导定语从句，在定语从句中用作宾语)
要学定语从句，得知道什么是定语。定语是用来限定、修饰名词或代词的。例如，a good book, good就是定语。那么复合句中修饰名词或代词的从句就叫做定语从句。定语从句由关系代词或关系副词引导，相当于形容词，在句中作定语。被定语从句修饰的词叫先行词，定语从句一般放在先行词的后面。
引导定语从句的关联词称为关系词，关系词有关系代词和关系副词。关系代词有that, which, who, whom, whose等，绝对没有what;关系副词有where, when, why,how等。关系词放在先行词和定语从句之间，起连接作用，同时又作定语从句的某个成分。
一、关系代词引导的定语从句
1、由who, whom, that，Whose引导的从句
这些词代替的先行词是人的名词或代词，who作主语指人，whom作宾语指人，that既可作主语又可作宾语(作宾语可以省略)，可以指人也可以指物。Whose 用来指人或物，只用作定语。
(1) Is he the man who/that wants to see you? 他是那个想见你的男人吗?(who/that在从句中作主语)
(2) 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)
(3) The man whom you spoke to just now is our English teacher 你刚刚说话的那个男人是我们的英语老师
(4) he man whose son is a doctor is our professor. 那个儿子是医生的男人是我们的教授。
2、由which, that引导的从句
它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等，作宾语时可以省略，例如：
(1) 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在从句中作主语)
(2) The package (which / that) you are carrying is about to come unwrapped. 你拿那个包裹快要散开了。(which / that在从句中作宾语)
注意： 代表物时多用which，但在下列情况中用that而不用which：
a)先行词是anything, everything, nothing , none等不定代词时;
b)先行词由every, any, all, some, no, little, few, much等修饰时，这时的that常被省略;
c)先行词前有序数词或被形容词最高级修饰时;
d)先行词中既有人又有物时;
e)整个句中前面已有which，who,that时;
f)当先行词为物并作表语时;
g)先行词为one时;
h)先行词同时又被the only,the very,the same修饰时;
二、关系副词晌渗绝引导的定语从句
1、when指时间在定语从句中做时间状语也可喊源做连接词用 I still remember the day when I first came to the school.
2、where指地点在定语从句中做地点状语Shanghai is the city where I was born.
3、why指原因在定语从句中做原因状语 ，用在reason 后面。 Please tell me the reason why you missed the plane.
常见考法
对于定语从句的考查，多以单选的形式考查学生灵活运用的能力。一般情况下，常从关系词的意义和宴姿功能的角度考查，重点是that,which,who引导的定语从句。
典型例题：You're the only person ______I've ever met ______could do it.
A. who B. whom C. whom D. who
解析：先行词person后有两个定语从句,第一个从句省略了关系代词whom.因为, whom作从句中met的宾语,可以省略.第二个从句who could do it.who在从句中作主语,不可省略.
答案：D
误区提醒
当表示时间或地点的名词作先行词时，要判断出它们在从句中作状语还是主语或宾语。作状语时用关系副词，反之用关系代词。
典型例题：I can never forget the day _______ we worked together and the day ______ we spent together.
A. when; which B. which; when C. what; that D. on which; when
解析：. 两个先行词the day都是表示时间的名词,但第一个空白处要填的关系词在从句中作状语,因此要用关系副词when. 第二个空白处要填的关系词在从句中作动词spent的宾语,因此要用关系代词which或that来引导定语从句.
答案：A
上述是对定语从句的详细讲解，有不懂得可以参考等更多相关知识的学习!
初中英语语法大全：动词的种类
关于英语中动词的种类知识，希望同学们很好的掌握下面的内容学习。
动词的种类
动词是表示动作或状态的词，按其词义和在句子中的作用可分为行为动词，连系动词，助动词和情态动词。
1.行为动词
行为动词可分为及物动词 (vt)和不及物动词(vi)，及物动词表示动作或状态，有完整的词义，能单独作谓语，后跟宾语;不及物动词表示动作或状态，有完整的词义，能单独作谓语，但后面不能直接跟宾语，如要带宾语则与介词或副词构成短语。
如：
More and more people study English.(vt)
The students are listening to the teacher carefully.(vi)
2.连系动词
连系动词本身有一定的词义，但不能独立作谓语，必须与表语一起构成谓语。常用的连系动词有 be, get, turn, become, look, feel, grow, seem, sound, taste, smell等。
如：
Our country is becoming stronger and stronger.
It feels damp.
3.助动词
助动词本身无词义，不能单独作谓语，只能和主要动词一起构成谓语动词，表示否定，疑问及动词的时态、语态、人称和数等语法特征，助动词有 be,do,have,shall,will等。
如：
How do you usually come to school?
The children are playing yo-yo now.
4.情态动词
情态动词本身有一定的意义，但不能独立作谓语，只能和主要动词原形一起构成谓语，表示说话人的语气和情态。情态动词没有人称和数的变化。情态动词有 can (could),may(might),must, need, ought to, dare等。
如：
Can I help you?
