1、關系代詞that和which都可指屋， 在定語從句中作主語或定語時，一般 可以互換，但各自也有專用場合。一有下列情形之一時，一般用that。 如：1當先行詞前面有形容詞最高級或 者序數詞修飾時。例如：These are the cleanest parks that you can imagine.This is the first thing that I afford by myself.2 當先行詞是不定代詞all, anything , everything, something, nothing, little, few, much, none 等時。All that can be

2、done hasbeen done.This book contains little that is interesting and useful.3 當先行詞被 both, all, every , no, any, much等修飾的時候。如：There is no book that I like to read here.4當先行詞為人，物共存的時候。如：Can you tell methe person and place that you would like to visit 5當先行詞前面有the very, only, last等表示唯一概念的詞修飾的時候。如:This is

3、 the very problem thatI cannot answer.This is the last thing thatI would like to do.5當定語從句的謂語動詞是 be,需 要關系代詞作表語的時候。My computer is no longer the machine that it was.6 當主句是由which或who引起的 特殊疑問句時。如：Which is the computer that you want to useWho is the manthat you spoke to just now7當先行詞是數詞的時候。如：Yesterday I

4、bought two fish and put them I a basin of water. Now you can see the two that are still alive.二 有下列情形之一的時候，只能用 which:1當引導的是非限制性的定語從句 的時候。如：Tom won the game, which madehim very happy.2當先行詞作介詞的賓語并與介詞 一起置于句首的時候。如：The house in front of which stands a big tree is hers.3當在一個句子中有兩個定語從句， 其中一個定語從句的關系代詞用了 tha

5、t, 則另一個宜用which.如：He give me a gift that had been bought from the shop which belong to his uncle.4當先行詞為指物的代詞that和those 時。如：He has found that I am looking for.What are those which he refusedto accept5當關系代詞后面有插入語的時候。如：Here is the book which, as Ihave told you, will help improve you English.用關系代詞that或者w

6、hich填空：1 This is the tenth novel shows his great success.2 He has got all he neededin his studies.3 Which is the book you wantto read4 We often talked of the classmates and things we still remember.5 Did you see the tallest tree I used to climb when I was a child6 who is the person you areto meet in

7、 the afternoon7 Please return the book to methatI borrow from the libraryis not far away from our school.8 You can choose any necklace you like.9 Is this the room in he lives.10 The monitor said that Tom didn ' t finish his homework ,made the teacher angry.are the cleanestparks _ you canimagine.

8、（序數詞/最高級） can be done has been done.This book contains little is interesting and useful. (all, anything, everything, something, nothing, little few, much, none) 13. There' s no book I like toread here.(both,all,every,no,any,much ) 14. Canyou tell methe persons and places you ' d like to visi

9、t.15. This is the very problemI can not answer.This is the last thing _ I ' d like to do.16. My computer is no longer the machine that it was.（ 關系代詞作 表語時）17. Which is the computer that you want to seeWho is the man that you spoke to just now18. Yesterday I bought two fish and put them in a basin

10、 of water. Now you can see the two that are still alive.won the game, which madehim very happy.20. He gave mea gift that had been bought from the shop which belongs to his uncle.（兩個定語從句不宜同時使用）has found that which I amlooking for.What are those which he refused to accept22. Here is the book which, as

11、 I have told you, will help improve your English.as的用法：其通常和such the same 連用，代指物在從句中做主語或賓語This is the same pen as I bought yesterday 。這種筆和我昨天買的筆一樣（同樣的 但不是同一個）。引導定語從句的關 系詞在從句中做賓語，因先行詞被 the same所修飾所以用as引導注意：上句與下句的區別 This isthe samepen that I used yesterday.這就是昨天我使用的那一支鋼筆（指 的是同一個）。I studied in the sames

12、chool as she did in Beijing.我和他在北京的同一所學校就讀。引導定語從句的關系詞在從句中做 賓語，因先行詞被the same所修飾 所以用as引導I want to have such a dictionary as he has.我想要一本和他的一樣的字典。引導定語從句的關系詞在從句中做 賓語，因先行詞被such所修飾所以 用as引導as的用法：在從句中通常做主語代 指整個主句，表示的意思是正如正 象其引導的定語從句即可以放在 主句之前也可以放在主句之后。The Pacific is the largest ocean,as we all know.太平洋是最大的洋

13、，這一點我們都知 道（正如我們所知到的，太平洋是最 大的洋）。引導非限制性定語從句的as在從句 中做know的賓語，其代指整個主句。As we expect, we won the game.我們贏了，這一點在我們預料之中。（正如我們預料的一樣，我們贏了）。引導非限制性定語從句的as在從句 中做主語，其代指整個主句。從句在 主句的前面The earth is round, as weall know.地球是圓的，這一點我們都知道。（正 如我們所知到的一樣地球是圓的）引導非限制性定語從句的as在從句 中做know的賓語，其代指整個主句。As is known to all, he is the

14、best student in our class.眾所周知，他是我們班上最好的學 生。（正如我們所知到的一樣，他是 我們班上最好的學生。引導非限制性定語從句的as在從句 中做主語，其代指整個主句。which的用法：關系代詞，在從句 中做主語或賓語，代指人或物。當 代指整個主句時表示的意思是主句 和從句之間是因果關系即因為所以。 其引導的非限制性定語從句只能 放在主句之后。Tomsuddenly fell ill, which made us sad.Tom突然病倒，這使得我們很傷心。Which引導的非限制性定語從句在從 句中做主語，其代指整個主句，主從 句的關系是因果關系，因為他的病， 所以我們傷心。The road wa