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定語從句的知識點匯總
在現(xiàn)實學習生活中，大家對知識點應該都不陌生吧？知識點也可以理解為考試時會涉及到的知識，也就是大綱的分支。為了幫助大家掌握重要知識點，以下是小編精心整理的定語從句的知識點匯總，希望對大家有所幫助。
定語從句的知識點 1
(一)定語從句一般由關系代詞和關系副詞引導
1、關系代詞:who, whom, whose, which, that, as
2、關系副詞:when, where, why
關系代詞和關系副詞必須位于從句之首,主句先行詞之后,起著連接先行詞和從句的作用, 同時在從句中又充當句子成分。
e.g. She is the girl who sings best of all.(關系代詞who在從句中作主語)
The comrade with whom I came knows French.(whom在從句中作介詞with的賓語)
3、關系代詞和關系副詞的用法:1)當先行詞為人時用who 作主語,whom作賓語;2)當先行詞為物或整個句子時用which ,可作主語或賓語;3)先行詞為人、物時用that ,可作主語或賓語;4)whose用作定語,可指人或物;5)關系副詞when(指時間,在定語從句中作時間狀語,where(指地點,在定語從句中作地點狀語),why(指原因,在定語從句中作原因狀語)。
(二)限制性定語從句與非限制性定語從句
1、限制性定語從句:從句與主句關系密切,去掉從句,主句意義不完整,甚至不合邏輯。
e.g. I was the only person in our office who was invited.(去掉定語從句,意思就不完整)
2、非限制性定語從句:從句對先行詞關系不密切,去掉定從句,意思仍然完整。形式上用逗號隔開,不能that用引導。
e.g. Toms father, who is over sixty, still works hard day and night.(who引導非限制性定語從句,整個句子可分成兩句來翻譯)
(三)使用定語從句時特別注意的幾個問題
1、that與which的區(qū)別。
1)用that而不用 which的情況:①先行詞為不定代詞all, anything, nothing, …;②先行詞有最高級修飾,有序數(shù)詞修飾;③先行詞有only, very, any等詞修飾;④先行詞既有人又有物時。
e.g. There is nothing that can prevent him from doing it. 沒有什么能阻止他不干那件事。
The first place that they visited in Guilin was Elephant Trunk Hill. 在桂林他們所參觀的第一個地方是象鼻山。
This is the best film that I have ever seen. 這部電影是我看過的最好的一部。
Mr Smith is the only foreigner that he knows. 史密斯先生是他認識的唯一的外國人。
2)用which而不用 that的情況:①引導非限制性定語從句;②代表整個主句的意思;③介詞 + 關系代詞。
e.g. He had failed in the maths exam, which made his father very angry. 他數(shù)學考試沒有及格,這使他的父親很生氣。
This is the room in which my father lived last year. 這是父親去年居住過的房子。
3)as引導定語從句時的用法
�、賏s引導限制性定語從句通常用于the same … as, such … as結構中。
e.g. I want the same shirt as my friends. 我要一件跟我朋友一樣的襯衫。
Such machines as are used in our workshop are made in China. 我們車間使用的這種機器是中國制造的。
②as引導非限制性定語從句既可放在主句之前,也可放在主句之后,用來修飾整個句子。通常用下列句型:as is known to all, as is said, as is reported, as is announced, as we all know, as I expect 等。
e.g. As I expected, he got the first place again in this mid-term examination. 正如我所預料的'那樣,他在這次期中考試中又獲得了第一名。
3)as 引導非限制性定語從句時與which的區(qū)別
�、佼斨骶浜蛷木湔Z義一致時,用as;反之,用which來引導非限制性定語從句。
e.g. He made a long speech, as we expected.
He made a long speech, which was unexpected.
�、诋敺窍拗贫ㄕZ從句為否定時,常用which引導。
e.g. Tom drinks a lot every day, which his wife doesnt like at all.
2. 關系代詞在從句中作主語時,從句的謂語動詞單數(shù)還是用復數(shù)應由先行詞決定。
e.g. The man who lives downstairs speaks English fluently. 住在樓下的那個人英語說得很流利。
The students who are in Grade Three are going to climb the hill tomorrow.
3. 定語從句有時不直接緊靠先行詞,中間由一個定語、狀語或謂語隔開。
e.g. There is an expression in his eyes that I cant understand.
4. 引導定語從句的關系副詞有時可以用"介詞 + which"來代替。
e.g. October 1, 1949 was the day on which ( = when ) the Peoples Republic of China was founded.
5. 當定語從句中謂語動詞是帶介詞或副詞的固定短語動詞時,短語動詞的各個固定部分不要拆開。
e.g. The sick man whom she is looking after is her father.
6. 介詞在關系代詞前,只能用which和whom,且不能省略;介詞在句尾,關系代詞可有which, that, whom, 口語中也可用who,且可省略。
e.g. The man (whom/ who/ that) you were talking about has come to school.
定語從句的知識點 2
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(yī)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(nóng)村出現(xiàn)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(shù)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)當先行詞為物并作表語時;
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 后面。 Please tell me the reason why you missed the plane.
常見考法
對于定語從句的考查，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：Youre the only person ______Ive ever met ______could do it.
A. who B. whom C. whom D. who
解析：先行詞person后有兩個定語從句,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(qū)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
定語從句的知識點 3
一、定語從句的概念
在復合句中，修飾某一名詞或代詞的從句叫定語從句。被修飾的名詞或代詞叫先行詞，定語從句一般放在先行詞的后面。
二、定語從句的關系詞
引導定語從句的關系詞有關系代詞和關系副詞，常見的關系代詞包括that， which， who（賓格whom，所有格whose）等，關系副詞包括where， when， why等。關系代詞和關系副詞放在先行詞及定語從句之間起連接作用，同時又作定語從句的重要成分。
三、定語從句的分類
根據(jù)定語從句與先行詞的關系，定語從句可分為限制性定語從句及非限制性定語從句。限制性定語從句緊跟先行詞，主句與從句不用逗號分開，從句不可省去，非限制性定語從句主句與從句之間有逗號分開，起補充說明作用，如省去，意思仍完整。
四、關系代詞的用法
1. that 既可以用于指人，也可以用于指物。在從句中作主語或賓語，作主語時不可省略，作賓語可省略。例如：
Mary likes music that is quiet and gentle.瑪麗喜歡輕柔的音樂。（that作主語）
The coat （that） I put on the desk is blue.我放在桌子上的那件外套是藍色的。（that作賓語）
2.which用于指物，在句中作主語或賓語，作主語不可省略，作賓語可省略。例如：
The building which stands near the train station is a supermarket.位于火車站附近的那座大樓是一家超市。（作主語）
The film （which） we saw last night was wonderful. 我們昨天晚上看的那部電影很好看。（作賓語）
3.who， whom用于指人，who 用作主語，whom用作賓語。在口語中，有時可用who代替whom，也可省略。例如：
The girl who often helps me with my English is from England.經(jīng)常在英語方面幫助我的那個女孩是英國人。（作主語）
Who is the teacher （whom） Li Ming is talking to？正在與李明談話的老師是誰？（作賓語）
注意：（1）當定語從句中含有介詞，介詞放在句末時，who， that， which可省略，但介詞在關系代詞前時，只能用“介詞+which/whom”結構。例如：
This is the house in which we lived last year.這是我們去年居住的房子。
Please tell me from whom you borrowed the English novel.請告訴我你從誰那借的這本英文小說。
�。�2）含有介詞的固定動詞詞組中，介詞不可前置，只能放在原來的位置上。例如：
This is the person whom you are looking for. 這就是你要找的那個人。
�。�3）that 作介詞的賓語時，介詞不能放它的前面，只能放在從句中動詞的后面。例如：
The city that she lives in is very far away.她居住的城市非常遠。
�。�4）關系詞只能用that的情況：
a. 先行詞被序數(shù)詞或形容詞最高級所修飾，或本身是序數(shù)詞、基數(shù)詞、形容詞最高級時，只能用that，而不用which.例如：
He was the first person that passed the exam. 他是第一個通過考試的人。
b.被修飾的先行詞為all， any， much， many， everything， anything， none， the one等不定代詞時，只能用that，而不用which.例如：
Is there anything that you want to buy in the shop？你在商店里有什么東西要買嗎？
c.先行詞被the only， the very， the same， the last， little， few 等詞修飾時，只能用that，而不用which.例如：
This is the same bike that I lost.這就是我丟的那輛自行車。
d. 先行詞里同時含有人或物時，只能用that， 而不用which.例如：
I can remember well the persons and some pictures that I saw in the room.我能清楚記得我在那個房間所見到的人和一些照片。
e.以who或which引導的`特殊疑問句，為避免重復，只能用that.例如：
Who is the girl that is crying？ 正在哭泣的那個女孩是誰？
f.主句是there be 結構，修飾主語的定語從句用that，而不用which.例如：
There is a book on the desk that belongs to Tom. 桌子上那本書是湯姆的。
�。�5）關系詞只能用which，而不用that 的情況：
a.先行詞為that， those時，用which， 而不用that.例如：
What’s that which is under the desk？ 在桌子底下的那些東西是什么？
b.關系代詞前有介詞時，一般用which，而不用that.例如：
This is the room in which he lives. 這是他居住的房間。
c.引導非限制性定語從句，用which， 而不用that.例如：
Tom came back， which made us happy. 湯姆回來了，這使我們很高興。
五、關系副詞的用法
（1）when指時間，其先行詞表示時間，在句中作時間狀語。例如：
This was the time when he arrived.這是他到達的時間。
�。�2）where指地點，其先行詞表示地點，在句中作地點狀語。例如：
This is place where he works.這是他工作的地點。
�。�3）why 指原因，其先行詞是原因，起原因狀語作用。例如：
Nobody knows the reason why he is often late for school. 沒人知道他為什么上學總遲到。
延伸閱讀：定語從句知識重點與難點
（一）當先行詞有最高級，序數(shù)詞修飾，是不定代詞，或是all, no, only等形式時，關系代詞一般用that，而不能用which。
1. The Titanic was the largest ship that had ever been built at that time.
2. There is one thing that keeps worrying me.
�。ǘ┊斚刃性~是表示時間，地點，原因的詞時，關系詞用when, where, why 還有which, that
1. I’m very glad to return to my hometown where I had lived for 10 years.
2. This is my hometown which I used to talk about to you.
3. I think I can understand the reason why he didn’t tell the truth to me.
4. No one believes the reason that he gave us about his absence at the meeting.
�。ㄈ┒ㄕZ從句的簡化表達：
1. The man who is sitting on the platform is a professor from Wuhan University.
2. The letter that was mailed last night will reach him tomorrow.
3. The question that is being discussed is very important.
4. You are welcome to a party to be given in our class at 7:45.
說明：以上的定語從句部分可以用更加簡單的非謂語形式表達出來：
1. The man sitting on the platform is a professor from Wuhan University.
2. The letter mailed last night will reach him tomorrow.
3. The question being discussed is very important.
4. You are welcome to a party to be given in our class at 7:45.
說明：修飾一個名詞除了后面用定語從句以外，還可以用非謂語動詞形式：doing短語，done短語，being done短語，to be done短語修飾。其結構和意思如下：
1. 被修飾名詞+doing短語： 正在做….的人/正在發(fā)生的事。
2. 被修飾名詞+ done短語： 被…..的人/事
3. 被修飾名詞+being done短語：正在被…..的人/事
4. 被修飾名詞+ to be done短語：將要被…..的人/事
（1）Do you know the man talking to my sister ?
�。�2）The “crazy” gesture, moving the index finger in a circle in front of the ear, means “you have a phone call” in Brazil.
（3）Did you see that car being repaired ?
（4）In a camera, the lens must be focused on the object to be photographed.
�。�5）The students to attend the meeting will arrive here tomorrow.
�。�6）Goods imported from abroad are not always better than those made in China.
（7）The Yellow River, said to be “the mother river” runs across China like a huge dragon.
總結：以上做定語的那些短語就是英語語法中所說的分詞，不定式的各種形式作定語。
1. 這些短語作定語應放在被修飾名詞的后面。如果單獨一個V-ing或V-ed形式作定語，則可以放在被修飾名詞前面。
2. 分詞作定語時，其動作應與全句動作同時發(fā)生。V-ing表示主動意義和正在做，V-ed表示被動意義。being done表示正在被做的
3. 不定式作定語表示將要發(fā)生的，to be done表示將要被做的
定語從句的知識點 4
很多同學可能都會覺得在使用定語從句的時候，有時不知該選擇that還是which作為引導詞。其實只要記得以下幾點，并多做練習，在具體的句子中加以理解，一切問題就可以迎刃而解了。
首先，that和which在從句里都可以做賓語和主語，做賓語時可以省略。在定語從句中,有種說法叫"關賓省",意思是關系代詞在限制性定語從句中作賓語可以省略,不管是that，which，還是whom。但是which能引導非限制性定語從句，that則不行。
其次，記得以下只能用that的幾種情況：
1. 當先行詞為all, much, little, none及由any, every, some, no所構成的復合不定代詞時。
如：We should do all that is useful to the people. 我們應該做一切有益于人民的事情。
Please tell me anything that you know about the matter. 有關此事，凡是你所知道的請告訴我。
2. 當先行詞被any, few, little, no, all, much, some等詞修飾時。
如：You can take any seat that is free. 任何空著的座位你都可以坐。
There is little work that is fit for you. 幾乎沒有適合你的工作。
3. 當先行詞為序數(shù)詞或被序數(shù)詞所修飾時。
如：When people talk about the cities of China, the first that comes to my mind is Beijing. 人們談論起中國的城市的時候，我首先 想到的是北京。
This is the fourth film that has been shown in our school this term. 這是我們校本學期放映的第四部電影。
4. 當先行詞為形容詞最高級或被形容詞最高級修飾時。
如：The best that I could do was to apologize. 我唯一能做的就是賠禮道歉了。
This is the most interesting story book that I have ever read. 這是我讀過的一本最有趣的故事書。
5. 當先行詞被the very, the only, the last, the just, the same等修飾時。
如： This is the very book that I’m looking for. 這正是我在找的書。
The only thing that we could do was to wait. 我們唯一能做的事就是等待。
注意：先行詞被the same修飾時，關系代詞也可用as。
如：I need the same book that / as you have. 我需要有你一樣的書。
6. 當先行詞既包含人又包含物時。
如： They are talking of the heroines and their deeds that interest them. 他們正在談論他們感興趣的女英雄及她們的事跡。
7. 當先行詞是疑問代詞who，which，what或主句以這些詞開頭時。
如：Who that has ever worked together with him doesn’t admire him? 曾經(jīng)和他一起工作過的誰不欽佩他？
Which is the star that is nearer to the earth？ 哪個是離地球比較近的'星星？
8. 當先行詞為主句表語或關系代詞為從句表語時。
如：That’s a good book that will help you a lot. 那是本對你很有幫助的書。
Our school is no longer the place that it used to be. 我們的學�，F(xiàn)在已不是過去的那個樣子了。
9. 先行詞為time時，當time表示次數(shù)，引導詞用that, 可省略。 當表示時間，可用that或when引導，都可省略。
如：I do remember the first time(that) I had ever heard the sweetest voice in the world.我很清楚地記得當我第一次聽到世界上最美的聲音的時候。
定語從句的知識點 5
�。ㄒ唬┒x
1)在復合句中（一個句子的某一成分由句子承當），修飾某一名詞或代詞從句叫定語從句或形容詞從句；在句中起定語的作用.
2)被定語從句修飾的詞叫做先行詞antecedent
1) The man who lives next to us is a policeman.
先行詞 關系代詞 定語從句
2) You must do everything that I do.
先行詞 關系代詞 定語從句
(二)：關系代詞的作用;
1.連接主句和從句。
2.代表被修飾的先行詞。
3.在定語從句做一個句子成分。
eg. This is the room which I lived in last year.
先行詞 關系代詞 定語從句
(三)：定語從句中有 關系代詞 who, whom, whose, which, that, as.
關系副詞 when, where, why 等引導定語從句。
�。ㄋ模河藐P系代詞還是用關系副詞
關系代詞起代詞的作用，關系副詞起副詞的作用，因此同樣的先行詞，選用什么樣的關系詞，要由它在定語從句中擔任的邏輯作用來決定。
（六） 關系代詞that和which的區(qū)別
<1>． 只能用that的情況
1) 非限制性定語從句中，不能用關系代詞that,作賓語用的關系代詞也不能省略。如：
There are about seven million people taking part in the election, most of whom、are well educated.
Bei jing , which is china’s capital, is rich in culture.
2)those/that +名詞后的定語從句用which引導。不能用關系代詞that。
That pen which he took is mine.
A shop should keep those goods which sells well.
3) 介詞后只用which
This is the room in which he lived.
I don’t know the man to whom you talked.
The chair on which he is sitting is made of wood.
(4) which還有一種特殊用法，它可以引導從句修飾前面的整個主句，代替主句所表示的整體概念或部分概念。在這種從句中，which可以作主語，也可以作賓語或表語， 不用that..例如：
He succeeded in the competition, which made his parents very happy.
(5)先行詞是that時，關系代詞要用which.
What’s that which flashed in the sky just now?
(6) 關系代詞后面有插入語時，益用關系代詞 which.
Here is the English grammar book which, as I have told you, will help to improve your English.
<3>．只用who, whom.而不用that的情況
(1) 如果先行詞是anyone, anybody, everyone, everybody, someone, somebody, those, ones等時，關系代詞應該用 who 或whom，不用 which .that。例如：
Is there anyone here who will go with you?
People all like those who have good manners.
�。�2） 當先行詞是指人的集合名詞時，如果作這個名詞著眼于集體的整體，關系代詞用which;若是指集體中的各個成員，則用who。
Mr. Smith came to visit my family, who were watching TV then.
Our class, which is a very good one, was praised again at the meeting.
(3)當先行詞有較長的 后置定語或者在被分割的定語從句中，宜用關系代詞 who
Pro. Wang is coming soon who will give us a talk on how to learn English.
(4) 當先行詞用-body 或-one 構成的復合不定代詞時，關系代詞用who
We’d better not believe in anyone who we don’t know.
(5) 當先行詞是一個限定性的表示人的特定名詞時，常用who
The aunt/uncle who came to see us last week is my brother’s sister.
�。ㄆ撸敖樵~＋關系代詞“是一個普遍使用的結構
(1)“介詞＋關系代詞“可以引導限制性定語從句，也可以引導非限制性定語從句。“介詞＋關系代詞“結構中的介詞可以是 in, on, about, from, for, with, to at, of, without 等，關系代詞只可用whom或 which,不可用 that 。其中whom代表人，which代表物
Who is the comrade with whom you shook hands?
He works in a factory, in front of which there is a river
Give me the book the cover of which is red (the cover of which=whose cover)
He is the man whose father is a teacher.=He is the man the father of whom is a teacher.
This is the neighborhood from whom I borrowed the bicycle.
(2) from where為“介詞＋關系副詞“結構，但也可以引導定語從句（不常用）。例如：
We stood at the top of the hill, from where we can see the town..
�。�3）***關系代詞前的介詞如何確定？
A.依據(jù)定語從句中動詞的某種習慣搭配
Mr. Smith bought a new house on which he spent all his money.
B.依據(jù)先行詞的某種習慣搭配確定
There was no way in which it could be bought back to the earth. ( in this way)
C.根據(jù)所表達的意思確定
The gas with which doctors can save the patients is called oxygen.
The gas without which we can not live is called oxygen.
(4)***注意關系代詞的位置
介詞在關系代詞前時，只能用which 和whom不能用that 代替，也不可省略；介詞在句尾時，關系代詞可which ,that ,whom, who,都行，而且還可以省略。
This is the drawer in which I put my letters.
= This is the drawer (which/that )I put my letters in.
Have you seen the pen with which I wrote letters this morning?
= Have you seen the pen (which/that) I wrote letters with this morning?
所以一個句子有時有多種用法
如：那就是他工作的大學
This is the college at which he works.
This is the college that/which he works at.
This is the college where he works.
但像listen to, look at, depend on, pay attention to, take care of等固定短語動詞，在定語從句中一般不宜將介詞與動詞分開。例如：
This is the boy whom she has taken care of.
This is the book which /that I am looking for.
This is the girl I have been looking for the whole afternoon.
�。ò耍� whose 引導從句的意義
1）指人=of whom 表示所修飾的“某（些）人的用做所修飾的先行詞的所有格。
A child whose parents are dead is called an orphan.
2) 指物=of which 表所修飾的“某物的“
I live in the room whose window faces south.
I live in the room, the window of which faces south
( whose +從句 可以用“of which +從句”代替)
（九）As 與which 是有區(qū)別的
A) 相同之處： 都可以用來引導非限制性定語從句，指代前面的主句所表達的內容。which 可做賓語或表語
He failed once more in the match, which was a great pity.
He succeeded in the composition, which made his parents very happy.
B) 區(qū)別：
1）as引導的非限制性定語從句位置較靈活，可以位于主句前面．中間或后面，一般用逗號與主句隔開，但which所引導的非限制性定語從句只能放在主句之后。例如：
1) As we all know, Galileo’s theory of falling objects is right.
= Galileo’s theory of falling objects, as we all know, is right
= Galileo’s theory of falling objects is right, as we all know.
2) He was thrown into prison, which got round throughout our village
3) As is expected, the England team won the football match.
4) The earth runs around the sun, as is known by everyone.
5) He was late again, which made me unhappy
6) As you know, he is good at English.
2.） as有“如” 、“正如”、“像”、“正像”的含義，which 沒有。后面的謂語動詞多是see, know, expect, say, mention, report等。
Bob did an excellent job, as we had expected.
Our team won the game, which made us happy.
As is known to all, Taiwan is part of China.
We are facing the same problems as we did years ago.
We are facing the problems which we faced years ago.
We hope to get such a tool as he is using.
We hope to get the tool which he is using.
3.) as 在引導限制性定語從句多與such 或the same連用，可以代替先行詞是人或物的名詞。
the same…as such….as
This is the same story as he told me.
I hope to get such a book as he is using
4).as 也可單獨使用，引導非限制性定語從句，作用相當于which�？纱硪粋�句子。例如：
The elephant’s nose is like a snake, as anybody can see.
5).as做主語時， 其后必跟系動詞，而which 無此限制
The meeting was put off, as was what we wanted.
He was murdered, as seemed true.
6)as引導從句時，從句語義必須和主句一致
She was married again, which was unexpected
She was married again, as was unexpected 7
7）the same …as 與the same ..that 的區(qū)別： 前者修飾的是原物同樣的
而后者修飾的就是先行詞
This is the same watch as I lost.這和我丟的那一只手表是一樣的。
This is the dame watch that I lost.著就是我丟的那一只手表。
�。ㄊ┦裁磿r候that 可以省略？
1) 引導同位語從句，主語從句，表語從句不能省略，且不做成分。
The name “ whitewater ”comes from the fact that the water in these streams and rivers looks white when it moves quickly.
It’s known to all that light travels in straight lines. ( that 置后可一省略)
The reason for his absence was that he was ill. ( 有時可省，一般不省)
2）賓語從句中可以省略
I don’t think (that) you are right.
3）that 只有在定語從句中做成分，可做主、賓、表語。
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