怎麼用英語給初中生講定語從句

Ⅰ 英語定語從句的講解，詳細一點再有點典型例句難一點，(九年級)

一.定語從句及相關術語
1.定語從句：修飾一個名詞或代詞的從句稱為定語從句，一般緊跟在它所修飾的先行詞後面。
2.關系詞：引導定語從句的關聯詞成為關系詞
關系詞有關系代詞和關系副詞。關系代詞有that, which, who, whom, whose, as 等；
關系副詞有where, when, why等。
關系詞常有3個作用：1，引導定語從句。2，代替先行詞。3，在定語從句中擔當一個成分。
二.關系代詞引導的定語從句
1.who指人，在從句中做主語
(1) the boys who are playing football are from class one.
(2) yesterday i helped an old man who lost his way.
2. whom指人，在定語從句中充當賓語，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：關系代詞whom在口語和非正式語體中常用who代替，可省略。
(3) the man who/whom you met just now is my friend.
3. which指物，在定語從句中做主語或者賓語，做賓語時可省略
(1) football is a game which is liked by most boys.
(2) this is the pen (which) he bought yesterday.
4. that指人時，相當於who 或者whom；指物時，相當於which。在賓語從句中做主語或者賓語，做賓語時可省略。
(5) the number of the people that/who come to visit the city each year rises one million.
(6) where is the man that/whom i saw this morning?
5. whose通常指人，也可指物，在定語從句中做定語
(1) he has a friend whose father is a doctor.
(2) i once lived in a house whose roof has fallen in.
whose指物時，常用以下結構來代替
(3) the classroom whose door is broken will soon be repaired.
(4) the classroom the door of which is broken will soon be repaired.
(5) do you like the book whose cover is yellow?
(6) do you like the book the color of which is yellow?
三.介詞+關系代詞引導的定語從句
關系代詞在定語從句中做介詞賓語時，從句常由介詞+關系代詞引導
(1) the school (that/which) he once studied in is very famous.
(2) the school in which he once studied is very famous.
(3) tomorrow i will bring here a magazine (that/which) you asked for.
(4) tomorrow i will bring here a magazine for which you asked.
(5) we'll go to hear the famous singer (whom/that/who) we have often talked about.
(6) we'll go to hear the famous singer about whom we have often talked.
注意：1. 含有介詞的動詞短語一般不拆開使用，如：look for, look after, take care of等
(1) this is the watch which/that i am looking for. (t)
(2) this is the watch for which i am looking. (f)
2. 若介詞放在關系代詞前，關系代詞指人時用whom，不可用who或者that；指物時用which，不能用that；關系代詞是所有格時用whose
(1) the man with whom you talked is my friend. (t)
(2) the man who/that you talked with is my friend. (f)
(3) the plane in which we flew to canada is very comfortable. (t)
(4) the plane in that we flew in to canada is very comfortable. (f)
3.「介詞+關系代詞」前可有some, any, none, both, all, neither, most, each, few等代詞或者數詞
(1) he loved his parents deeply, both of whom are very kind to him.
(2) in the basket there are quite many apples, some of which have gone bad.
(3) there are forty students in our class in all, most of whom are from big cities.
解答"介詞+關系代詞 "類型的定語從句題時，關鍵在於分析定語從句中的謂語動詞（該動詞是不及物動詞）習慣上常與什麼介詞搭配使用。這就需要同學們在平時學習時要注重某些不及物動詞和介詞慣用的情形，並要靈活運用。例如：
in the dark street, there wasn't a single person ________ she could turn for help.
a. that b. who c. from whom d. to whom
簡析:本題定語從句中的turn 與介詞 to 構成固定短語"turn to sb. for help (向某人求助）"。所以，d是正確選項。

四．關系副詞引導的定語從句
1. when指時間，在定語從句中做時間狀語
(1) i still remember the day when i first came to the school.
(2) the time when we got together finally came.
2. where指地點，在定語從句中做地點狀語
(1) shanghai is the city where i was born.
(2) the house where i lived ten years ago has been pulled down.
3. why指原因，在定語從句中做原因狀語
(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：關系副詞引導的從句可以由「介詞+關系代詞」引導的從句替換
(1) the reason why/ for which he refused the invitation is not clear,
(2) from the year when/in which he was going to school he began to know what he wanted when he grew up.
(3) great changes have taken place in the city in which/where i was born.
關系副詞when, where, why的含義相當於"介詞+ which"結構，因此常常和"介詞+ which"結構交替使用，例如：
there are occasions when (on which) one must yield. 任何人都有不得不屈服的時候。
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? 這就是他拒絕我們幫助他的理由嗎？
五．限制性定語從句和非限制性定語從句

限制性定語從句舉例：
(1) the teacher told me that tom was the only person that i could depend on.
(2) china is a country which has a long history.
非限制性定語從句舉例：
(1) his mother, who loves him very much, is strict with him.
(2) china, which was founded in 1949, is becoming more and more powerful.
要注意區分以下幾個句子的不同
(1) his brother who is now a doctor always encourages him to go to college.
他那當醫生的哥哥常鼓勵他要考上大學。（他還有其他的哥哥）
(2) his brother, who is now a doctor, always encourages him to go to college.
他的哥哥是當醫生的，常鼓勵他要考上大學。（他只有一個哥哥）
難點分析
（一）限制性定語從句只能用that 的幾種情況
1．當先行詞是anything, everything, nothing (something 除外), few, all, none, little, some 等代詞時，或者是由every, any, all, some, no, little, few, much 等修飾時
(1) have you taken down everything that mr. li has said?
(2) there seems to be nothing that seems impossible for him in the world.
(3) all that can be done has been done.
(4) there is little that i can do for you.
注意：當先行詞指人時，偶爾也可以用who
(4) any man that/.who has a sense of ty won't do such a thing.
2. 當先行詞被序數詞修飾
(1) the first place that they visited in london was the big ben.
3. 當先行詞被形容詞最高級修飾時
(1) this is the best film that i have seen.
4. 當形容詞被the very, the only修飾時
(1) this is the very dictionary that i want to buy,
(2) after the fire in his house, the old car is the only thing that he owned.
當先行詞指人時，偶爾也可以用who
(3) wang hua is the only person in our school who will attend the meeting/
5. 當先行詞前面有who, which等疑問代詞時
(1) who is the man that is standing there?
(2) which is the t-shirt that fits me most?
6. 當先行詞既有人，也有動物或者物體時
(1) can you remember the scientist and his theory that we have learned?
（二）關系代詞as和which 引導的定語從句
as和which引導非限制性定語從句，有相同之處也有不同之處。具體情況是：
1．as和which都可以在定語從句中做主語或者賓語，代表前面整個句子。
(1) he married her, as/which was natural.
(2) he was honest, as/which we can see.
2. as引導非限制性定語從句，可放在主句之前，或者主句之後，甚至可以切割一個主句；which引導的非限制性定語從句只能放在主句之後。另外，as有「正如……，正像……」的意思
(1) as is known to all, china is a developing country.
(2) he is from the south, as we can see from his accent.
(3) john, as you know, is a famous writer.
(4) he has been to paris more than several times, which i don't believe.
注意：當主句和從句存在邏輯上的因果關系時，常用which
(5) tom was always late for school, which made his teacher angry.
3. 當先行次受such, the same修飾時，常用as
(1) i have never heard such a story as he tells.
(2) he is not such a fool as he looks.
(3) this is the same book as i lost last week.
注意：當先行次由the same修飾時，偶爾也用that引導定語從句，但是和由as 所引導的定語從句意思不同
(4) she wore the same dress that she wore at mary's wedding.
她穿著她在mary婚禮上穿過的一條裙子。
(5) she wore the same dress as her young sister wore.
她穿著和她妹妹所穿的一樣的裙子。
（三）以the way為先行詞的定語從句通常由in which, that引導，而且通常可以省略。
(1) the way in which/ that/./ he answered the question was surprising.

Ⅱ 初中英語 定語從句

初中英語 定語從句篇一

定語是用來限定、修飾名詞或代詞的。下面就是老師為同學們帶來的對定語從句的詳細講解，供同學們學習的參考。

知識點總結

要學定語從句，得知道什麼是定語。定語是用來限定、修飾名詞或代詞的。例如，a good book, good就是定語。那麼復合句中修飾名詞或代詞的從句就叫做定語從句。定語從句由關系代詞或關系副詞引導，相當於形容詞，在句中作定語。被定語從句修飾的詞叫先行詞，定語從句一般放在先行詞的後面。引導定語從句的關聯詞稱為關系詞，關系詞有關系代詞和關系副詞。關系代詞有that, which, who, whom, whose等，絕對沒有what；關系副詞有where, when, why,how等。關系詞放在先行詞和定語從句之間，起連接作用，同時又作定語從句的某個成分。

一、關系代詞引導的定語從句

1、由who, whom, that，Whose引導的從句

這些詞代替的先行詞是人的名詞或代詞，who作主語指人，whom作賓語指人，that既可作主語又可作賓語（作賓語可以省略），可以指人也可以指物。Whose 用來指人或物，只用作定語。

(1) Is he the man who/that wants to see you? 他是那個想見你的男人嗎？（who/that在從句中作主語）

(2) He is the man whom/ that I saw yesterday. 他就是我昨天見的那個人。（whom/that在從句中作賓語）

(3) The man whom you spoke to just now is our English teacher 你剛剛說話的那個男人是我們的英語老師

(4) he man whose son is a doctor is our professor. 那個兒子是醫生的男人是我們的教授。

2、由which, that引導的從句

它們所代替的先行詞是事物的名詞或代詞，在從句中可作主語、賓語等，作賓語時可以省略，例如：

(1) Prosperity which / that had never been seen before appears in the countryside. 農村出現了前所未有的繁榮。（which / that在從句中作主語）

(2) The package (which / that) you are carrying is about to come unwrapped. 你拿那個包裹快要散開了。(which / that在從句中作賓語）

注意： 代表物時多用which，但在下列情況中用that而不用which：

a)先行詞是anything, everything, nothing , none等不定代詞時；

b)先行詞由every, any, all, some, no, little, few, much等修飾時，這時的that常被省略；

c)先行詞前有序數詞或被形容詞最高級修飾時；

d)先行詞中既有人又有物時；

e)整個句中前面已有which，who,that時；

f)當先行詞為物並作表語時；

g)先行詞為one時；

h)先行詞同時又被the only,the very,the same修飾時；

二、關系副詞引導的定語從句

1、when指時間在定語從句中做時間狀語也可做連接詞用 I still remember the day when I first came to the school.

2、where指地點在定語從句中做地點狀語 Shanghai is the city where I was born.

3、why指原因在定語從句中做原因狀語 ，用在reason 後面。 Please tell me the reason why you missed the plane.

常見考法

對於定語從句的考查，多以單選的形式考查學生靈活運用的能力。一般情況下，常從關系詞的意義和功能的角度考查，重點是that,which,who引導的定語從句。

典型例題：You're the only person ______I've ever met ______could do it.

A. who B. whom C. whom D. who

解析：先行詞person後有兩個定語從句,第一個從句省略了關系代詞whom.因為, whom作從句中met的賓語,可以省略.第二個從句who could do it.who在從句中作主語,不可省略.

答案：D

誤區提醒

當表示時間或地點的名詞作先行詞時，要判斷出它們在從句中作狀語還是主語或賓語。作狀語時用關系副詞，反之用關系代詞。

典型例題：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：. 兩個先行詞the day都是表示時間的名詞,但第一個空白處要填的關系詞在從句中作狀語,因此要用關系副詞when. 第二個空白處要填的關系詞在從句中作動詞spent的賓語,因此要用關系代詞which或that來引導定語從句.

答案：A

上述是對定語從句的詳細講解，有不懂得可以參考等更多相關知識的學習！

初中英語語法大全：動詞的種類

關於英語中動詞的種類知識，希望同學們很好的掌握下面的內容學習。

動詞的種類

動詞是表示動作或狀態的詞，按其詞義和在句子中的作用可分為行為動詞，連系動詞，助動詞和情態動詞。

1．行為動詞

行為動詞可分為及物動詞 (vt)和不及物動詞(vi)，及物動詞表示動作或狀態，有完整的詞義，能單獨作謂語，後跟賓語；不及物動詞表示動作或狀態，有完整的詞義，能單獨作謂語，但後面不能直接跟賓語，如要帶賓語則與介詞或副詞構成短語。

如：

More and more people study English.(vt)

The students are listening to the teacher carefully.(vi)

2．連系動詞

連系動詞本身有一定的詞義，但不能獨立作謂語，必須與表語一起構成謂語。常用的連系動詞有 be, get, turn, become, look, feel, grow, seem, sound, taste, smell等。

如：

Our country is becoming stronger and stronger.

It feels damp.

3．助動詞

助動詞本身無詞義，不能單獨作謂語，只能和主要動詞一起構成謂語動詞，表示否定，疑問及動詞的時態、語態、人稱和數等語法特徵，助動詞有 be,do,have,shall,will等。

如：

How do you usually come to school?

The children are playing yo-yo now.

4．情態動詞

情態動詞本身有一定的意義，但不能獨立作謂語，只能和主要動詞原形一起構成謂語，表示說話人的語氣和情態。情態動詞沒有人稱和數的變化。情態動詞有 can (could),may(might),must, need, ought to, dare等。

如：

Can I help you?

- Must we go now? -No, you needn't .

a. can與be able to的用法有所區別。can只用於一般現在時和過去時，指本身有能力的"能"；be able to用於各種時態均可，指須經過努力而"能"。

b. must與have/has to的用法。must表示說話人主觀認為"必須"，只用於一般現在時和一般將來時；have/has to表示客觀需要，意為"不得不"，它可用於各種時態。

c．need和dare既可作情態動詞也可作行為動詞。

以上對動詞的種類知識的內容講解學習，相信同學們已經能很好的掌握了吧，希望同學們在考試中取得很好的成績。

初中英語語法大全：動詞不定式的形式

對於英語的學習中，關於動詞不定式的形式知識點的內容，我們做下面的講解學習哦。

動詞不定式的形式

1．作主語。 如：

To learn English is very important.

但實際上不定式作主語常用 it來作形式主語，而將不定式移至謂語動詞後作真正的主語。

如上句可表達為：

It's very important to learn English.

2．作表語。 如：

My idea is to ring him up at once.

3．作賓語。 如：

I have decided to go to Binjiang Primary School.

4．作賓語補足語。

a. ask, want, teach, tell, know, would like, allow等動詞後面接動詞不定式作賓語補足語。

如： The policemen asked him to get off the bus.

b. hear, see, look at, feel, watch, notice, listen to等動詞後接不帶to的動詞不定式作賓語補足語。

如： We often see Miss Li clean the classroom.

c. let, make, have這些使役動詞後接不帶to的動詞不定式作賓語補足語。但在被動語態中這些不帶to的都須帶上to。

如： In those days the bosses often made the workers work day and night.

d.動詞help接動詞不定式作賓語補足語，可帶to也可不帶to。

如： Can you help me (to) carry the heavy bag?

5．作定語。

a.與被修飾詞有動賓關系。如：I have something important to tell you.但如果不定式動詞為不及物動詞，後面的介詞千萬不要省略。

如： Maybe they have three rooms to live in.

b.與被修飾詞有主謂關系。

如： Mr Liang is always the first to come and the last to leave.

c.與被修飾之間只有修飾關系。

如： I have no time to play cards.

6．作狀語，表示目的、原因、方法、方向、結果等。

如： I'll go to meet my friend at the railway station.

7．不定式復合結構"for sb. to do sth" 作主語時，常用"It is +adj+ for

of sb. to do sth"的句式。形容詞good, bad, polite, unkind, kind, ice, clever,

right, wrong, careful等用"It is +adj +of sb. to do sth."

其他形容詞用 for。

如：

It's dangerous for you to ride so fast.

It's very kind of you to help me.

8．動詞不定式與疑問句who, what, which, when, how, where, whether等連用。

如： I don't know when to start.

He didn't tell me where to go.

但上面結構相當於一個從句，故上述句子也可表達為：

I don't know when we'll start.

He didn't tell me where he would go.

注意：

a.有些動詞或動詞短語不能帶不定式，只能接動詞的-ing形式。

如： enjoy, finish, keep, mind, miss(錯過),be busy, go on, keep on, be worth, practise等。

如： The peasants are busy picking apples.

Would you mind my opening the door?

b.有些動詞後可接不定式，也可接動詞的.-ing形式，但意思不同。

如： Lu Jian forgot to post the letter.(該寄但還沒做)

Lu Jian forgot posting the letter.(已經寄過信了)

They stopped to sing a song.(停止在做的工作而去做另一件工作)

They stopped singing.(停止正在做的工作)

希望上面對動詞不定式的形式知識的內容講解學習，同學們都能很好的掌握，相信同學們會取得很好的成績的哦。

初中英語語法大全：短語動詞的四種類型

同學們認真學習，下面是老師對短語動詞的四種類型知識總結。

短語動詞的四種類型

動詞與介詞、副詞等構成的固定短語，叫短語動詞。主要有四類：

一、動詞+副詞

有的一般不跟賓語，如go ahead, fall behind, get up, lie down, go up, run out, give in, stay up等；有的可以跟賓語，如put out, carry out, give up, wake up, check in, eat up, fill in, find out, fix up, hand in, mix up, look up, make out, turn down, work out等。

注意：賓語是名詞時，放在副詞前面或後面都可以，但若作賓語的是人稱代詞時，就只能放在動詞和副詞之間了。如：

We』ve decided to put the meeting off (=put off the meeting) . 我們決定把會議推遲。

We』ve decided to put it off. 我們決定將它推遲。(不說put off it)

二、動詞+介詞

如ask for, care for, call for, break into, deal with, call on, look for等。後面必須接賓語。如：

I don』t care for tea. 我不喜歡喝茶。

三、動詞+副詞+介詞

如look forward to, put up with, looked up to, go in for, go along with, date back to, look down on, keep up with, add up to, run out of等。如：

She soon caught up with us. 她很快趕上了我們。

四、動詞+名詞+介詞

如take care of, pay attention to, make use of, make contribution to做出貢獻等。如：

Take care of your brother while I am away. 我不在的時候，你要照顧好你弟弟。

希望上面老師對短語動詞的四種類型知識的講解學習，同學們都能很好的掌握，相信同學們會學習的很好的哦。

初中英語語法大全：及物動詞與不及物動詞

關於英語中及物動詞與不及物動詞的知識學習，我們做下面的內容講解。

及物動詞與不及物動詞

根據其後是否帶賓語，動詞可分為及物動詞(帶賓語)和不及物動詞(不帶賓語)。如：

When will he arrive? 他什麼時候到？(arrive 不帶賓語，為不及物動詞)

He reached Beijing yesterday. 他昨天到達北京。(reach 帶了賓語，為及物動詞)

有的動詞既可用作及物動詞也可用作不及物動詞：

The child is playing. 這小孩在玩。（不及物用法）

The child is playing the piano. 這小孩在彈鋼琴。（及物用法）

He is writing. 他在寫字。（不及物用法）

He is writing a letter. 他在寫信。（及物用法）

The boy is reading. 這男孩在閱讀。 （不及物用法）

The boy is reading a magazine. 這男孩在看雜志。（及物用法）

上面對及物動詞與不及物動詞知識的內容講解學習，希望給同學們的學習很好的幫助，相信同學們會學習的更好的吧。

初中英語語法大全：實義動詞與非實義動詞

下面是對英語中實義動詞與非實義動詞知識的內容講解，希望同學們很好的掌握。

實義動詞與非實義動詞

根據其含義和句子功用，動詞可分為實義動詞和非實義動詞(包括時態助動詞和情態助動詞等)。如：

He bought a story book. 他買了一本故事書。(buy 為實義動詞)

He has read the story book. 他已讀過這本故事書。(has 為時態助動詞，read為實意動詞)

He should read the story book. 他應該讀讀這本故事書。(should 為情態助動詞,red為實義動詞)

初中英語 定語從句篇二

一 . 誤用關系詞

1. I'll never forget the days when we spent together on the farm.

2. This is the factory where he was invited to visit last month.

分析：定語從句的先行詞是表示時間或地點的名詞或代詞時，引導定語從句的關系詞不一定都是 when 或 where 。關系詞的選擇主要取決於定語從句中的謂語動詞。如果從句的謂語動詞是及物動詞而且其後沒有賓語，就用關系代詞 that 或 which 作賓語。如果從句的謂語動詞是不及物動詞或者是後面已經有了賓語的及物動詞，就用關系副詞。在句 1 和句 2 中，從句謂語動詞 spent 和 visit 都是及物動詞，而且後面又沒有賓語，所以應分別將 when 和 where 改為 that 或 which 。

二 . 賓語重復

1. As we all know it, the earth is round.

2. The manager discussed the plan that they would like to see it carried out the next month.

分析：如果關系代詞在從句中作賓語，則謂語動詞後面就不能再有賓語。在句 1 中，關系代詞 as 作從句謂語動詞 know 的賓語，因此， it 就是多餘的，應去掉。在句 2 中，關系代詞 that 在從句中作動詞 see 的賓語，因此 it 也是多餘的，應去掉。

三 . 缺少先行詞或關系詞

1. Is this park where his father works?

Ⅲ 初中英語語法定語從句專項講解與訓練

這篇關於初中英語語法定語從句專項講解與仿尺吵訓練，是 特地為大家整理的，希望對大家有所幫助！

一、定語從句概念
定語從句（attributive clause），顧名思義，就是一個句子作定語從屬於主句。定語一般是由形容詞充當，所以定語從句又稱作形容詞從句。另外，定語從句是由關系代詞或關系副詞引導的，故又稱作關系從句。
定語從句一般放在它所修飾的名詞或代詞之後，這種名詞或代詞被稱作先行詞。請看示例：
The woman who lives next door is a teacher.
先行詞 定語從句
在所有的從句中，算定語從句最難掌握，因為漢語里沒有定語從句，漢語里只有定語，而且總是放在名詞之前來修飾名詞。

二、關系代詞引導的定語從句
關系代詞代替前面的先備侍行詞，並且在定語從句中充當句子成分，可以作主語、賓語、定語等。常見的關系代詞有：who, that, which。它們的主格、賓格和所有格如下表所示：
格
先行詞 主格 賓格 所有格
人 who whom whose
物 which which
whose
of which
人、物 that that —

（一）關系代詞who, whom和 whose的用法
who代替人，是主格，在定語從句中作主語困稿。例如：
An architect is a person who designs buildings. 建築師是設計房屋的人。
I will never forget the teacher who taught us chemistry in the first year of my senior middle school. 我將永遠不會忘記在高一時教我們化學的那位老師。
Anyone who wants to apply for this job must send us the resume by email first. 想應聘這個職位的任何人都必須先通過電子郵件向我們發送簡歷。
whom代替人，是賓格，在定語從句作賓語，在非正式英語常可省略。例如：
Do you know the gentleman whom we met in the school library yesterday? 昨天我們在學校圖書館里遇到的那位先生你認識嗎？
This is the student whom my father taught ten years ago. 這是我爸爸十年前教的學生。
The girl who I saw is called Mary. 我見到的那個女孩名叫瑪麗。（在非正式英語中，主格who代替了賓格whom，亦可省略）
whose一般代替人，有時亦可代替物，是所有格，在定語從句作定語。例如：
The girl student whose father is a senior engineer used to study abroad. 其父是一位高級工程師的那個女學生過去在國外留學。
Do you know the name of the hotel whose window we can see here? 我們這兒能看到窗戶的那個賓館叫什麼名字，你知道嗎？（關系代詞whose指代先行詞hotel，正式用法應該用of which。whose window=the window of which，意思是：the window of the hotel。）

（二）關系代詞which的用法
which代替物，在定語從句作主語或賓語，作賓語時還可省略。例如：
I do not like stories which have unhappy endings.
我不喜歡有不幸結局的小說。（which可以換成that）
Tom works for a factory which makes watches.
湯姆在一個製表廠工作。（which可以換成that）
（三）關系代詞that的用法
that既可指人又可指物，在當代英語中大多指物，在定語從句作主語或賓語，作賓語時還可省略。例如：
Is she the girl that sells newspapers?
她是賣報紙的那個女孩嗎？（that可以換成who）
Where is the ice-cream that was in the fridge?
放在冰箱的冰激凌哪兒去了？（that可以換成which）
Is this the book that you want to buy?
這是你要買的那本書嗎？ （that可以換成which，在定語從句作賓語，還可以省略）

三、關系副詞引導的定語從句
常用的關系副詞只有三個：when, where, why，在定語從句中充當時間、地點和原因狀語。它們的用法大家不妨記住一個口訣：
the time when
the place where
the reason why
（一）關系副詞when的用法
關系副詞when代替的先行詞表示的是時間，when在定語從句作時間狀語。例如：
In Beijing July and August are the months when it rains very often.
北京的七月和八月是常下雨的月份。（when先行詞是months）
Do you remember the day when we first went to the Summer Palace?
你還記得我們第一次去頤和園的那一天嗎？（when先行詞是day， 當代英語里when可以用that替代，這時關系代詞that就變成了表示時間的關系副詞）
I haven』t seen her since the year when I left Tokyo.
自從我離開東京的那一年我就一直沒見到過她。（when先行詞是year，同樣when可以用that代替）

（二）關系副詞where的用法
關系副詞where代替的先行詞表示的是地點，where在定語從句作地點狀語。例如：
During the Spring Festival I went back to the town where I was brought up.
春節期間，我回到了生我養我的家鄉。（where的先行詞是town）
This is the place where Li Bai once lived.
這是李白曾經生活過的地方。（where先行詞是place）
上面這個句子不可以將where改為that，因為that不能作為表示地點的關系副詞。試比較下句：
This is the place that Li Bai once visited.
這是李白曾經游覽過的地方。（that的先行詞同樣是place，但這個that是關系代詞，在定語從句中作賓語，可以省略，還可以用which替換）

（三）關系副詞why的用法
關系副詞why代替的先行詞表示的是原因，why在定語從句作原因狀語。例如：
The reason why I am phoning you is to ask you whether you have got my email.
我打電話給你的原因是想問問你是否收到了我的電子郵件。（why先行詞是reason， 當代英語里why可以用that替代，這時關系代詞that就變成了表示原因的關系副詞，還可以將why省略）
This is the reason why he came late to school.
這就是他為什麼上學遲到的原因。（why先行詞是reason，why可以用that替代，還可以省略）
注意：如果上面的句子將the reason省略，那麼這個句子就變成了（This is why he came late to school. ）表語從句，句子意思絲毫未變。

四、特殊關系代詞as引導的定語從句
as是個比較特殊的關系代詞，一是用在某些句型搭配里，二是獨立於主句之外。下面分別講解。
（一）在固定搭配as…as, so…as, such…as, the same…as中，as引導定語從句
You may take as many books as you want.
你想要拿多少書就拿多少。（第一個as是副詞，修飾many的；第二個as才是關系代詞，代替先行詞books，在定語從句中作賓語）
I have got such a computer as yours.
我有一台你這樣的電腦。（as是關系代詞，代替先行詞computer，在定語從句中作表語，因為yours後省略了is ）
I have never seen so beautiful a place as Guilin.
我從未見過像桂林那樣美麗的地方。（as是關系代詞，代替先行詞place，在定語從句中作表語，因為Guilin後省略了is ）

（二）獨立於主句之外，as引導定語從句
As we know,
the earth turns around the sun. 正如我們所知，地球圍繞太陽旋轉。
As is known to us,
（As we know和 As is known to us均為定語從句，as分別作賓語和主語，替代後面的主句。）
Taiwan is, as you know, is an inseparable part of China.
你知道，台灣是中國不可分割的一部分。（關系代詞as指代整個主句，在定語從句中作賓語。）

五、關系代詞who, which與that的區別
（一）關系代詞who與that的區別
1. 當關系代詞用作主語時，多用主格who。例如：
He who loses hope loses all.
失去希望的人就失去一切。（先行詞為代詞he, they, any, all, one等時，多用who）
I met Alice, who told me that she was learning Chinese.
我遇見艾麗斯，她告訴我她在學漢語。（在非限制性定語從句中，用who）
2. 當關系代詞用作介詞後的賓語時，用賓格whom，不用that。例如：
The man to whom our headmaster talked just now is our English teacher.
我們校長剛才與他談話的那個人是我們的英語老師。（介詞與關系代詞緊密相連時，只能用賓格whom，不可用主格who）
注意：介詞與關系代詞不是緊密相連時，或者說介詞放在句子後面時，這時可以用主格who，也可用that，還可以省略關系代詞。因此，上面的這句話還可以有如下四種說法：
(1) The man whom our headmaster talked to just now is our English teacher.
(2) The man who our headmaster talked to just now is our English teacher.
(3) The man that our headmaster talked to just now is our English teacher.
(4) The man our headmaster talked to just now is our English teacher.
第4句簡潔、自然，所以口語中用得最多。
3. 當關系代詞泛指人時，多用that。例如：
He is a man that is never afraid of failure.
他是個從不怕失敗的人。（that用來泛指人）
4. 當關系代詞出現在who開頭的疑問句時，應用that。例如：
Who is the girl that is talking to Tom in English?
用英語同湯姆交談的那個女孩是誰？（避免重復使用who，以免造成誤解或語義含混不清）

（二）關系代詞which與that的區別
1. 當先行詞為all, much, little以及不定代詞anything, something, everything等時，關系代詞多用that。例如：
All that glitters is not gold. 閃閃發光物，未必盡黃金。
She told me everything that she knew. 她把她所知道的一切都告訴了我。
2. 當先行詞的前面有形容詞級、序數詞或限定詞the only, the very, all, every, any, no等時，關系代詞一般都用that。例如：
This is the best novel that I have ever read. 這是我讀過的的一部小說。
He is the only person that has been invited to the ball. 他是惟一應邀參加舞會的人。
3. 當關系代詞出現在which開頭的疑問句時，應用that。例如：
Which was the hotel that was recommended to the foreign guest? 哪一個是推薦給外賓的賓館？（這里使用that很明顯是為了避免重復which）
4. 在非限制性定語從句中，關系代詞一般只用which。例如：
Beijing, which is the capital of the People』s Republic of China, will host the 2008 Olympic Games. 北京是中華人民共和國的首都，將主辦2008年奧運會。
5. 介詞後的關系代詞用which，而不用that。例如：
She has collected 600 stamps, 60% of which are German stamps. 她收集了600張郵票，其中60％是德國郵票。

六、定語從句的位置
如前所述，定語從句一般總是直接置於所修飾的名詞或代詞之後。有時候，定語從句與先行詞之間插入了其他的短語，這樣它們被分隔了，這種情況下的定語從句被稱作隔離定語從句。例如：
There was a girl upstairs who was shouting and crying, obviously mad.
樓上有一個女孩，大喊大叫。很明顯，她瘋了。（定語從句who was shouting and crying修飾the girl，被upstairs所隔開）
A new master will come tomorrow who will teach you German.
明天要來一位新老師教你們德語了。（定語從句置於句末以示強調）

Ⅳ 初中英語定語從句講解

定語從句即用句子來做定語，被修飾或被限制的詞稱作先行詞，例如
1.I don't know the girl who is talking there.
2.I don't know the girl who you met just now.
3.Give me the book that you read just now.
4.Give me the book ,which you read just now.
5.Give me the pen that you write with.
6.Give me the pen with which you write .
仔細看句子專中的book 和pen就是先行詞，他們後面屬的who that which 就是引導定語從句的關系代詞，當先行詞是人用who,先行詞是物用that,先行詞後出現介詞或逗號用which.
這是一種捷徑，細節問題找本語法書慢慢學。