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定語從句是所有從句裡較容易掌握，並且在考試中出現佔比相當重的一種從句類型，今天老師詳細整理了定語從句的內容，幫助同學們熟練掌握該知識點。
定語從句由關係代詞who、whom、whose、which、what、as和關係副詞where、when、why等引導，但須記住：
1.what不能引導定語從句.
2.關係詞的分析須考慮它在定語從句中的成分。
一.指人的關係代詞有who、whose、whom、that. 試分析：
The old man who/whom /that we visited yesterday is a famous artist.
Miss Wang is taking care of the child whose parents have gone to Beijing .
The man with whom my father shook hands just now is our headmaster.(=The man who/whom that my father shook hands with just now is our headmaster.)註：
A. 指人時有時只用who不宜用that。
1.先行詞為one、ones或anyone
(1)The comrade I want to learn from is the one who studies hard and works hard.
(2)Anyone who breaks the law should be punished.
2.先行詞為these時
These who are going to Beijing are the best students of our school.3.在there be 開頭的句子中
There is a student who wants to see you.
4.一個句子中帶有兩個定語從句，其中一個定語從句的關係代詞是that，另一個宜用who，以免重複。
The student that won the first prize is the monitor who works hards.5.在非限制性定語從句中
A。I met a friend of mine in the street, who had just come from Japan.
B.主句以who開頭的句子中,只用that,不用who。
二.指物的關係代詞有which、whose(=of which)、that. 試分析：
1. I like the books which / that were written by Lu Xun.
2. The desks (which/that) we made last year were very good.
3. This is the house in which we lived last year. (= This is the
house which /that we lived in last year.)
4. I live in the room whose windows face south. (= I live in the room ,the windows of which face south.)
註：
A. 介詞如果位於作為其賓語的關係代詞之前時，只能用whom、 which不能用who或that.
(1). The girl about whom they were talking is our monitor.
(2). The book in which there are many interesting things was written by Li Ming.
B. 部分短語動詞中的介詞不可與動詞拆開，在定語從句中其介詞不可前置，只能放在其動詞之後。
Is this the book which she is looking for?
The old man who/whom they are waiting for is Professor Li.
The child who/whom she is looking after is Wang Ping’s son.
C. 指物時，下列情況下只能用that ，不宜用which。
(1)先行詞為不定代詞，如All、much、anything、everything、nothing、something、none、the one等。
We are willing to do anything that is good to the people.
I have told them all (that) I know.
All that can be done has been done.
(2)先行詞是序數詞或被序數詞、修飾時。
The first book that I read last night was an English novel.
(3)先行詞是形容詞最高級或被最高級修飾時。
This is one of the most interesting films that I have ever seen.
This is the best that can be done now.
(4)如果有兩個或兩個以上分別表示人和物的先行詞時(先行詞既有人又有物)，定語從句的關係代詞用which和who都不合適，只能用that。
We know nothing about the doctors and the hospitals that you are talking about.
There are sheep and men that can be seen on the hill.
(5)如果先行詞被the only、the very、the last、the same、any、 few 、little、no、 all 、one of、 just修飾時。
This is the only book that can be lent to you.
(6)當主句是以which開頭的特殊問句時，關係代詞只用that。
Which is the dictionary that he used yesterday ?
D.只物時，下列情況下只能用which，不宜用that。
(1)關係代詞放在介詞之後
This is the factory in which we once worked.
(2)非限制性定語從句中
This is the book, which is written by Lu Xun.
(3)that，Those作主語時
Those which are on the desk are English books.
E.先行詞前有such、the same、 as時, 關係代詞用as，不用that, 但the same…as…表示同樣的, the same…that…表示同一的
He knows as many people as are present at the meeting.
Such people as you refer to are rare nowadays.
三.比較When/which、where /which、why.
which I still never forget.
This is the day when I joined the party.
which he spent reading the books.
where I found the book.
which makes machines.
This is the place which we once visited.
which I will never forget.
which I am looking for.
限制性定語從句與非限制性定語從句的區別：
限制性定語從句
非限制性定語從句
All the students who study hard have passed.學習努力的學生都考試及格了。(只有努力的及格了，不努力的沒及格。) All the students ,who study hard have passed.所有的學生都及格了，他們學習努力。(沒有人不及格，這些學生都很努力。)
從句是先行詞不可缺少的定語(如去掉，主句意思就不完整或不正確。) 從句是對先行詞的附加說明(如去掉，主句意思仍清楚，不受影響。) 與主句關係密切，不用逗號 與主句關係不十分密切，用逗號與主句隔開譯為漢語時，從句譯在先行詞前，與先行詞用「的」連接 譯為漢語時，從句放在主句後面關係代詞that可以代替who、whom(指人)、which(指物) 關係代詞不用that,只用who、whom(指人)、which(指物) 關係代詞代替賓語時可以省略 關係代詞不能省略關係代詞as和which
先研究下面兩個例句：
○1.This elephant is like a snake, as /which everybody can see. =As everybody can see, this elephant is like a snake. 任何人都看得出來，這頭象像條蛇。
○2.Tom didn’t pass the physics exam, which made his parents very angry. Tom物理考試不及格，這使得他父親很生氣。
這兩個例句中，as和which所代表的都是整個主句所表示的內容。但有兩點不同之處：
1. 在形式上as引導的非限制性定語從句可位於主句的後面，也可位於主句的前面;而which引導的非限制性定語從句只能位於主句的後面，不能位於主句的前面。
2. 在意義上，as引導的定語從句和主句的關係一般為一致關係，常譯為「正如……」，「就像……」，而which引導的定語從句和主句的關係是因果關係，或which引導的定語從句是對主句的評論。因此，在意思通順的情況下，which可代替as，而as許多時候不能代替which，如句○2。再如：
1.He was late again, as / which we had expected. =As we had expected, he was late again. 正如我們所料，他又遲到了。/他又遲到了這是我們早就料到的。
2. The street hasn’t been cleared for weeks, which makes it very dirty. 街道好多星期沒有打掃了，因此整條街很髒。(不用as)
3.The young man cheated his friend of much money, which was disgraceful. 那年輕人詐騙了他朋友許多錢財，這是不光彩的。(不 用as)
4.He takes exercise everyday, which has done a lot of good to his health. 他每天運動，這對他的身體很有好處。(不用as)
5.As has already been pointed out, English is rather difficult for a foreigner. 正如已經指出的那樣，英語對於初學者說，是相當難學的。在such…as…、the same…as…、 as…、 as many…/much as…等結構中,as不能用which代替。如：
1.Such books as this are too difficult for beginners. 這樣的書對於初學的人來說是太難了。
=Books such as this are …
=Books like this are …
2.I live in the same building as he (does). 我和他住再同一座大樓裡。
3.He knows as many people as are present at the meeting. 他認識所有到會的人。
4.That day we all got up early as usual. 那天我們和平時一樣，都起得很早。
「One of the +複數名詞」後面定語從句中謂語單複數情況
這一結構後面的定語從句的謂語動詞通常用複數形式，跟定語從句所*近的那個複數名詞在數上保持一致。如：
1. That is one of the books that are required for study at school.
2. This is one of the most wonderful novels that have been published since 1990.
3. She is one of the few persons who know Spanish .
4. This is one of the most famous plays that were written in the thirties,
如果one of +複數名詞這一結構前面帶有the only、the very之類的限定語，後面定語從句的謂語動詞則要用單數形式，這是因為定語從句在意義上修飾的是而不是那個複數名詞。如：
1.He is the only one of the teachers who knows French in our school.( 修飾the only one)
He is one of the teachers who know French in our school.( 修飾the teachers)
2.This is the only one of the rooms that is free now. (修飾the only one)
This is one of the rooms that are free now. (修飾rooms)
as與which引導的定語從句
兩者均可引導非限制性定語從句，有時可以互換，但下列情況多用as。
1. 關係代詞引導的定語從句居句首時。 As we all know, the earth is round.
2. 當與such或the same連用時，一般用as。 Such books as you tell me are interesting. I have the same plan as you.
3. 當從句和主句語義一致時，用as，反之則用which。 She has married again, as was expected. She has married again, which was unexpected.
4. as在從句中作主語時，後面常接行為動詞的被動語態，如be known，be said，be reported等，如從句中行為動詞是主動語態，一般要用which作主語。
She has been late again, as was expected.
Tom has made great progress, which made us happy.
中公講師解析
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