定语从句的特殊用法定语从句的特殊用法定语从句由关系词（关系代词、关系副词）引导，关系代词、关系副词位于定语从句句首。定语从句的特殊用法定语从句由关系代词who、whom、whose、which、what、as和关系副词where、when、why等引导，但须记住：1.what不能引导定语从句.2.关系词的分析须考虑它在定语从句中的成分。一.指人的关系代词有who、whose、whom、that.试分析：Theoldmanwho/whom/thatwevisitedyesterdayisafamousartist.MissWangistakingcareofthechildwhoseparentshavegonetoBeijing.Themanwithwhommyfathershookhandsjustnowisourheadmaster.（=Themanwho/whomthatmyfathershookhandswithjustnowisourheadmaster.）注：A．指人时有时只用who不宜用that。1．先行词为one、ones或anyone（1）ThecomradeIwanttolearnfromistheonewhostudieshardandworkshard.（2）Anyonewhobreaksthelawshouldbepunished.2．先行词为these时ThesewhoaregoingtoBeijingarethebeststudentsofourschool.3．在therebe开头的句子中Thereisastudentwhowantstoseeyou.4．一个句子中带有两个定语从句，其中一个定语从句的关系代词是that，另一个宜用who，以免重复。Thestudentthatwonthefirstprizeisthemonitorwhoworkshards.5．在非限制性定语从句中A。Imetafriendofmineinthestreet,whohadjustcomefromJapan.B．主句以who开头的句子中,只用that,不用who。二．指物的关系代词有which、whose(=ofwhich)、that.试分析：1.Ilikethebookswhich/thatwerewrittenbyLuXun.2.Thedesks(which/that)wemadelastyearwereverygood.3.Thisisthehouseinwhichwelivedlastyear.(=Thisisthehousewhich/thatwelivedinlastyear.)4.Iliveintheroomwhosewindowsfacesouth.(=Iliveintheroom,thewindowsofwhichfacesouth.)注：A.介词如果位于作为其宾语的关系代词之前时，只能用whom、which不能用who或that.(1).Thegirlaboutwhomtheyweretalkingisourmonitor.(2).ThebookinwhichtherearemanyinterestingthingswaswrittenbyLiMing.B.部分短语动词中的介词不可与动词拆开，在定语从句中其介词不可前置，只能放在其动词之后。Isthisthebookwhichsheislookingfor?Theoldmanwho/whomtheyarewaitingforisProfessorLi.Thechildwho/whomsheislookingafterisWangPing’sson.C．指物时，下列情况下只能用that，不宜用which。（1）先行词为不定代词，如All、much、anything、everything、nothing、something、none、theone等。Wearewillingtodoanythingthatisgoodtothepeople.Ihavetoldthemall(that)Iknow.Allthatcanbedonehasbeendone.（2）先行词是序数词或被序数词、修饰时。ThefirstbookthatIreadlastnightwasanEnglishnovel.（3）先行词是形容词最高级或被最高级修饰时。ThisisoneofthemostinterestingfilmsthatIhaveeverseen.Thisisthebestthatcanbedonenow.（4）如果有两个或两个以上分别表示人和物的.先行词时(先行词既有人又有物)，定语从句的关系代词用which和who都不合适，只能用that。Weknownothi