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2019-2020年高考英語(yǔ) 語(yǔ)法復(fù)習(xí)一 定語(yǔ)從句教案20 牛津譯林版 （一）定義 1)在復(fù)合句中（一個(gè)句子的某一成分由句子承當(dāng)），修飾某一名詞或代詞從句叫定語(yǔ)從句或形容詞從句；在句中起定語(yǔ)的作用. 2)被定語(yǔ)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(guān)系代詞 定語(yǔ)從句 2) You must do everything that I do. 先行詞 關(guān)系代詞 定語(yǔ)從句 (二)：關(guān)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(yǔ)從句做一個(gè)句子成分。 eg. This is the room which I lived in last year. 先行詞 關(guān)系代詞 定語(yǔ)從句 (三)：定語(yǔ)從句中有 關(guān)系代詞 who, whom, whose, which, that, as. 關(guān)系副詞 when, where, why 等引導(dǎo)定語(yǔ)從句。 （四）：用關(guān)系代詞還是用關(guān)系副詞 關(guān)系代詞起代詞的作用，關(guān)系副詞起副詞的作用，因此同樣的先行詞，選用什么樣的關(guān)系詞，要由它在定語(yǔ)從句中擔(dān)任的邏輯作用來(lái)決定。 關(guān)系代詞 詞行 先行詞 充當(dāng)成分 who 人 主、賓、表 Whom 人 賓 That 人&物 主、賓、表 Which 物 主、賓、表 As 物 主、賓 Whose=of whom\of which 人&物 定語(yǔ) 關(guān)系副詞 When=at\in\on\during which 時(shí)間 狀 Where=at\in\to which 地點(diǎn) 狀 Why=for which 原因 狀 that 在口語(yǔ)中可以代替關(guān)系副詞 以上三者 狀 This is the place where we work.（vi.） (關(guān)系詞所做的成分關(guān)鍵是有從句中的動(dòng)詞來(lái)決定的) This is the place which we visited. (vt. ) 種類 先行詞 關(guān)聯(lián)詞 例句 說(shuō)明 定 語(yǔ) 從 句 （人）在從句中做主語(yǔ)或賓語(yǔ) 物在從句中做主語(yǔ)或賓語(yǔ) who which This is the doctor who saved the boy’s life . 這就是救了孩子生命的醫(yī)生。 She is the new student whom I want to introduce to you . 她就是我要介紹給你的新學(xué)生 Please pass me the book which is lying on the table. 請(qǐng)遞給我擺在桌上的那本書(shū)。 The novel which Tom bought is very interesting. 湯姆買的小說(shuō)很有意思。 Can you lend me the magazine about which you talked yesterday? 你能把昨天談到的那本雜志借給我嗎？ who在從句中做主語(yǔ) whom在從句中做賓語(yǔ)，口語(yǔ)中who可以代替whom，也可以被省去，但做介詞賓語(yǔ)時(shí)只能用whom which在從句中做主語(yǔ)。 which充當(dāng)賓語(yǔ)時(shí)可以省去。 which做介詞賓語(yǔ)不可省 定 語(yǔ) 從 句 人 或 物 的 whose The professor whose daughter teaches you English is Dr. Williams 那位教授是威廉斯他的女兒教你英語(yǔ)。 The professor, the daughter of whom teaches you English is Dr. Williams. The bike whose brake was damaged has now been repaired. 那輛壞了閘的自行車現(xiàn)在已經(jīng)修好了。 =The bike the brake of which was damaged has now been repaired whose在從句中做定語(yǔ) 指某人的也可以用…of whom代替whose 指物時(shí)也可以用…of which 代替 whose 人 或 that The woman that is playing the piano is Miss Zhang. 正在彈鋼琴的那位婦女是張小姐。 I’d like to see the films that are just on show. 我想看那些剛上映的電影。 that指人做主語(yǔ) that指物做主語(yǔ) 種類 先行詞 關(guān)聯(lián)詞 例 句 說(shuō) 明 物 all, littlemuch和some,any every ,no 構(gòu)成的合成代詞 人 或 物 that that They talked for about an hour of things and persons that they remember in the school. 他們談起他們所記得起的學(xué)校里的人和事，談了大約有半個(gè)小時(shí)。 I’ll tell you all(that )I know about it . 我要告訴你我所知道這件事的一切情況。 Is there anything (that) I can do for you? 有什么我可以幫助做的事嗎？ I’ve brought everything (that )you need. 我把你需要的東西都拿來(lái)了。 This is the best film that I have seen . 這是我看過(guò)的最好的一部電影。 The first place that we’ll visit is Beijing Library. 我們要參觀的第一個(gè)地方是北京圖書(shū)館 先行詞分別表示人和物，關(guān)系代詞要用that，不用who或which 先行詞表示物，關(guān)系代詞用that不用which, 在從句中做賓語(yǔ)可省去 。如果先行詞是人時(shí)，關(guān)系代詞不受制約，用that或who (whom) 均可 先行詞被形容詞最高級(jí)或序數(shù)詞修飾時(shí)定語(yǔ)從句用that引導(dǎo)。 　 定 語(yǔ) 從 句 人 或 物 that He is the only person that is believable. 他是唯一可靠的人。 John is the very person that she wants to see. 約翰正是她要見(jiàn)的人。 Who is the man that is talking with Tom ? 正在和湯姆談話的人是誰(shuí)？ Which of the books that you bought is easy to read? 你買的那些書(shū)中哪一本容易讀。 先行詞被the only, the very,the same 等修飾時(shí)用關(guān)系代詞that. 當(dāng)主句以who、which開(kāi)頭的特殊疑問(wèn)句時(shí)，定語(yǔ)從句要用that 時(shí) 間 when He came at a time when we. needed him most.他在我們最需要的時(shí)候來(lái)了。 We’ll never forget the day when the People’s Republic of China was founded. 我們永遠(yuǎn)不會(huì)忘記中華人民共和國(guó)成立的那一天。 在定語(yǔ)從句中作時(shí)間狀語(yǔ) 注：先行詞是time, minute, moment, next time很少用關(guān)系副詞when,可用that 但通常省去。 地點(diǎn) where This is the room where he put up for the night. 這就是他渡過(guò)夜晚的那房子。 在定語(yǔ)從句中作地點(diǎn)狀語(yǔ) 原因 理由 why I know the reason why she studies so well . 我知道她學(xué)習(xí)好的原因。 在定語(yǔ)從句中作原因狀語(yǔ) This is the place where work.（vi.） (關(guān)系詞所做的成分關(guān)鍵是有從句中的動(dòng)詞來(lái)決定的) This is the place which we visited. (vt. ) （五）：限制性定語(yǔ)從句與非限制性定語(yǔ)從句的區(qū)別 限制性定語(yǔ)從句 非限制性定語(yǔ)從句 從句與先行詞的關(guān)系 從句是先行詞不可缺少的定語(yǔ)，如果省去，主句的意思就會(huì)不完整或不明確。 從句只是對(duì)先行詞的附加說(shuō)明，如果省去,主句的意思仍然清楚或完整 標(biāo) 點(diǎn) 從句和主句之間不用逗號(hào)分開(kāi) 從句和主句之間通常用逗號(hào)分開(kāi) 關(guān) 系 代 詞 指人who (that) whom 指物which (that) 人和物whose 關(guān)系代詞在從句中作賓語(yǔ)時(shí)可以省去 指人who（作主語(yǔ)）whom（做賓語(yǔ)） 指物which 人和物的whose 關(guān)系代詞一般不可省 修飾 從句只修飾一個(gè)名詞或代詞 可以修飾一個(gè)名詞或代詞也可修飾整個(gè)主句 翻譯 定語(yǔ)從句譯在被修飾詞的前面 定語(yǔ)從句通常被譯成另一個(gè)獨(dú)立的句子 限制性 非限制性 形式上 無(wú)逗號(hào) 有逗號(hào) 內(nèi)容上 先行詞不是唯一的 先行詞是唯一的，定語(yǔ)從句可有可無(wú)。 關(guān)系詞 可用that ,why.作賓語(yǔ)可以省略 不可用that ,why。關(guān)系詞一律不省。 先行詞 名詞或代詞 名詞或代詞，也可以使整個(gè)句子 漢語(yǔ)翻譯 譯作定語(yǔ) 譯成并列句 1．二者差異比較 限制定語(yǔ)從句緊跟先行詞，同先行詞之間一般不加逗號(hào)，僅修飾先行詞，可以由關(guān)系代詞．關(guān)系副詞或that來(lái)引導(dǎo)。非限制性定語(yǔ)從句僅作補(bǔ)充或說(shuō)明，用逗號(hào)與主句隔開(kāi)，既可修飾先行詞，又可修飾整個(gè)主句，不可用that引導(dǎo)。 He has a brother who is a physicist. He has a brother, who is a physicist. (只有一個(gè)) He returned all the books which are written in English. He returned all the books, which are written in English. I will wear no clothes which will be out of ordinary. I will wear no clothes, which will be out of ordinary. The man who lives next door is a doctor. My sister, who lives next door, is a doctor. I’m sure I know the person who served me. Tom, who served us, is the owner of the restaurant. A student who studies hard will make good progress. The student, who lives far from school, is the leader of their football match. （六） 關(guān)系代詞that和which的區(qū)別 <1>． 只能用that的情況 (1) 如果先行詞是all, much, anything, something, nothing, everything, little, none ，few.等不定代詞，關(guān)系代詞一般只用that，不用which。例如： All the people that are present burst into tears. Everything that we saw was interesting. I’m interested in everything that I don’t know. All that is needed is a supply of oil. (2) 如果先等詞被 all ,little none any, only, few, much, no, some, very等詞修飾，關(guān)系代詞常用that,不用which. 例如：I read all the books that you gave to me. This is the only money that I have in my pocket. All the money that was collected was given to the Hope Project. (3) 如果先行詞被序數(shù)詞、形容詞最高級(jí)修飾或者先行詞是最高級(jí)時(shí)，關(guān)系代詞常用that,不用which。 This is the first book that was written in English. This is the last factory that I visited. This is the best film that I have ever seen. This is the funniest thing that I ever heard. (4) 如果先等詞被the only ,the very , the same ,the last修飾，關(guān)系代詞常用that,不用which. This is the only book that I really like. He was the only person in the office that was invited to the ball. (5) 先行詞有兩個(gè)，一個(gè)指人，一個(gè)指物，關(guān)系代詞應(yīng)該用that。而不用who, which. 例如： The boy and the dog that are in the picture are very lovely. He talked about the teachers and schools that he had visited. (6)who ,which開(kāi)頭的特殊疑問(wèn)句中，關(guān)系代詞用that. Who is the person that is standing there? Which of us that knows English doesn’t know this? which of the novel do you like best? (7) 關(guān)系代詞作表語(yǔ)時(shí)，關(guān)系代詞用that. It took us many years to make the city that it is today. He is not the man that he used to be. China isn’t the country it used to be. (8) 先行詞是奇數(shù)詞或是序數(shù)詞時(shí)，關(guān)系代詞用that . Yesterday I caught two fish. Now you can see the two that are still alive in the basin of water. (9) 當(dāng)主句 “ there be “開(kāi)頭時(shí)，關(guān)系代詞要用that 引導(dǎo)的定語(yǔ)從句修飾該句型的主語(yǔ)。 There are four desks in the middle of the office that are used for the teachers. (10) 當(dāng)先行詞是 “ to be “ 后面的表語(yǔ)時(shí)關(guān)系代詞用that . This is the dictionary that was bought in the bookstore yesterday. <2>．只能用which的情況 1) 非限制性定語(yǔ)從句中，不能用關(guān)系代詞that,作賓語(yǔ)用的關(guān)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(yǔ)從句用which引導(dǎo)。不能用關(guān)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(dǎo)從句修飾前面的整個(gè)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(yǔ)，也可以作賓語(yǔ)或表語(yǔ)， 不用that..例如： He succeeded in the petition, which made his parents very happy. (5)先行詞是that時(shí)，關(guān)系代詞要用which. What’s that which flashed in the sky just now? (6) 關(guān)系代詞后面有插入語(yǔ)時(shí)，益用關(guān)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(shí)，關(guān)系代詞應(yīng)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(dāng)先行詞是指人的集合名詞時(shí)，如果作這個(gè)名詞著眼于集體的整體，關(guān)系代詞用which;若是指集體中的各個(gè)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(dāng)先行詞有較長(zhǎng)的 后置定語(yǔ)或者在被分割的定語(yǔ)從句中，宜用關(guān)系代詞 who Pro. Wang is ing soon who will give us a talk on how to learn English. (4) 當(dāng)先行詞用-body 或-one 構(gòu)成的復(fù)合不定代詞時(shí)，關(guān)系代詞用who We’d better not believe in anyone who we don’t know. (5) 當(dāng)先行詞是一個(gè)限定性的表示人的特定名詞時(shí)，常用who The aunt/uncle who came to see us last week is my brother’s sister. （七）．“介詞＋關(guān)系代詞“是一個(gè)普遍使用的結(jié)構(gòu) (1)“介詞＋關(guān)系代詞“可以引導(dǎo)限制性定語(yǔ)從句，也可以引導(dǎo)非限制性定語(yǔ)從句。“介詞＋關(guān)系代詞“結(jié)構(gòu)中的介詞可以是 in, on, about, from, for, with, to at, of, without 等，關(guān)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 rade 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(guān)系副詞“結(jié)構(gòu)，但也可以引導(dǎo)定語(yǔ)從句（不常用）。例如： We stood at the top of the hill, from where we can see the town.. （3）***關(guān)系代詞前的介詞如何確定？ A.依據(jù)定語(yǔ)從句中動(dòng)詞的某種習(xí)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(xí)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(dá)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(guān)系代詞的位置 介詞在關(guān)系代詞前時(shí)，只能用which 和whom不能用that 代替，也不可省略；介詞在句尾時(shí)，關(guān)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(gè)句子有時(shí)有多種用法 如：那就是他工作的大學(xué) 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(yǔ)動(dòng)詞，在定語(yǔ)從句中一般不宜將介詞與動(dòng)詞分開(kāi)。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. （八） whose 引導(dǎo)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(lái)引導(dǎo)非限制性定語(yǔ)從句，指代前面的主句所表達(dá)的內(nèi)容。which 可做賓語(yǔ)或表語(yǔ) He failed once more in the match, which was a great pity. He succeeded in the position, which made his parents very happy. B) 區(qū)別： 1）as引導(dǎo)的非限制性定語(yǔ)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(hào)與主句隔開(kāi)，但which所引導(dǎo)的非限制性定語(yǔ)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(méi)有。后面的謂語(yǔ)動(dòng)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(dǎo)限制性定語(yǔ)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(dú)使用，引導(dǎo)非限制性定語(yǔ)從句，作用相當(dāng)于which?？纱硪粋€(gè)句子。例如： The elephant’s nose is like a snake, as anybody can see. 5).as做主語(yǔ)時(shí)， 其后必跟系動(dòng)詞，而which 無(wú)此限制 The meeting was put off, as was what we wanted. He was murdered, as seemed true. 6)as引導(dǎo)從句時(shí)，從句語(yǔ)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。 （十）什么時(shí)候that 可以省略？ 1) 引導(dǎo)同位語(yǔ)從句，主語(yǔ)從句，表語(yǔ)從句不能省略，且不做成分。 The name “ whitewater ”es 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(shí)可省，一般不省) 2）賓語(yǔ)從句中可以省略 I don’t think (that) you are right. 3）that 只有在定語(yǔ)從句中做成分，可做主、賓、表語(yǔ)。 （十一）關(guān)系代詞做主語(yǔ)，謂語(yǔ)動(dòng)詞的單復(fù)數(shù)取決于先行詞而不是關(guān)系代詞。 I want to see the film that is on show. The students who don’t study hard will not pas the exam. (十二)one of the… 與the one of the … 做先行詞時(shí)謂語(yǔ)不一致。 Li Bai is one of the greatest poets that have lived in China. Li Bai is the one of the greatest poets that has lived in China. This is one of the books that I have been written in Chinese. This is the only one of the books that has been written in Chinese. He is one of the boys who are willing to do it. He is the only one of the boys who is willing to do it. （十三）．關(guān)系副詞引導(dǎo)的定語(yǔ)從句 1．關(guān)系副詞也可以引導(dǎo)定語(yǔ)從句 關(guān)系副詞在從句中分別表示時(shí)間．地點(diǎn)或原因。關(guān)系副詞when在從句中充當(dāng)時(shí)間狀語(yǔ)，where 充當(dāng)?shù)攸c(diǎn)狀語(yǔ)，why充當(dāng)原因狀語(yǔ)。 1)when 表示時(shí)間, 充當(dāng)時(shí)間狀語(yǔ) when=on/ in/ of /at…+which I still remember the day when I join the party I will never forget the day when I first came to Beijing. 　但注意： 1.當(dāng)先行詞是表地點(diǎn)：place ,room, mountain, airport等時(shí)間：time, day, year, month, week,等原因：reason 等名詞時(shí),并且分別在句中做地點(diǎn)、時(shí)間、原因狀語(yǔ)時(shí)，應(yīng)用where ,when ,why引導(dǎo)。但是如果如果表示時(shí)間地點(diǎn)原因的名詞不做狀語(yǔ)，而是做主語(yǔ)，賓語(yǔ)，或者表語(yǔ)時(shí)，必須用關(guān)系代詞that /which來(lái)引導(dǎo)而不是用where等。 I still remember the day that we spent together。 May 1 is the day that I will never forget。 The Yangtze Gorges is a beautiful place (that /which) people all over the world look forward to visiting. 長(zhǎng)江三峽是個(gè)美麗的地方，全世界的人都渴望來(lái)參觀。 The moment (that /which) I turned around, she had left and disappeared in the crowd. Is this the reason that he gave us for being late? This is the factory that we visited That is the house that he lived in.. The place that we had been to was far. The shop that /which we saw is beautiful. 2.當(dāng)先行詞為 by the time ,any time , the way, every time, the first time ,the last time 時(shí)，關(guān)系詞不用when而用that.或省略 This is the last time that I shall give you a lesson. The first time I saw him was in 1980 By the time he was 14 he had learned advanced mathematics 但如果time前無(wú)修飾語(yǔ),關(guān)系詞用that when 均可 I will never forgot the time when (that) we met for the first time. 3. 當(dāng)先行詞為way 時(shí)，關(guān)系詞用in which ,that, 或省略. This is the way that/ in which / 不加 he smiles. 但注意： 4.why 表示原因（現(xiàn)行詞只有一個(gè) reason），做原因狀語(yǔ)。 Why= for which That is the reason why he was late. （十四）學(xué)生容易出現(xiàn)的問(wèn)題。 1. 在定語(yǔ)從句中多加了賓語(yǔ)，如： Some of the boys I invited them didn’t e. Some of the boys I invited didn’t e. Is this the horse you drew it yesterday? Is this the horse you drew yesterday? 2. 把定語(yǔ)從句的動(dòng)詞的單復(fù)數(shù)弄錯(cuò)。 Those who has finished may leave the classroom now. They key opens the room is missing. Those who have finished may leave the classroom now. This is one of the rivers in China which flows northward. This is one of the rivers in China which flows northward. 3. 省略了定語(yǔ)從句中做主語(yǔ)的關(guān)系代詞。 Children eat a lot of sugar often get bad teeth. Children who eat a lot of sugar often get bad teeth. They key opens the room is missing. They key which/that opens the room is missing. 4. 定語(yǔ)從句中加了多余的關(guān)系副詞或者是介詞。 The house where he lives in needs repairing. The house where he lives needs repairing. The house which/that he lives in needs repairing. This is the time at when he’s more likely to be in. This is the time when he’s more likely to be in. This is the time at which he’s more likely to be in. （十五）代有插入語(yǔ)的定語(yǔ)從句who 與whom 的選用。 擔(dān)主語(yǔ)成分時(shí)用who ,擔(dān) 賓格成分時(shí)用whom 方法：要區(qū)分是定語(yǔ)從句中的插入語(yǔ)還是主謂結(jié)構(gòu)。 Jason is a man who (I believed) is honest.(去掉仍成立) Jason is a man whom I believe to be honest. 做賓語(yǔ) The girl who we supposed was drowned came back. The girl who we supposed to be drowned came back. （十六）什么時(shí)候宜用非限制性定語(yǔ)從句 1） 當(dāng)先行詞是專有名詞時(shí)，通常用非限制性定語(yǔ)從句，它本身就具有特殊性，無(wú)需在加限定。 Shenzhen, which is in South China, is developing rapidly. My house, which I bought last year, has got a garden . Mr. Smith bought a new house on which he spent all his money. 2) 當(dāng)先行詞是具有某一特征的人或者物中的一個(gè)，但跟非限制從句時(shí)則表示唯一的一個(gè)，pare: Her room has a window which faces south. Her room has a window, which faces south. I have a brother who is working in Beijing. I have a brother, who is working in Beijing. 3.當(dāng)先行詞表示類屬意義，即表示某類動(dòng)物，事物或人時(shí)，其后所跟的定語(yǔ)從句一般是非限制性的。 A sleep is a useful animal, whose wool has many uses. Football, which is a very interesting game, is now played all over the world.