Non-definingattributiveclauses非限制性定语从句1.ThepoweroftheYangtzeRiver,whichistheworld’sthirdlongestriver,hasbeenharnessedbytheThreeGorgesDam.世界第三大长河---长江的能量已经被三峡大坝转化为了动力。Readandtranslatethesentences.2.TheThreeGorgesDam,whichisthebiggestconstructionprojectinChinasincethebuildingoftheGreatWallandtheGrandCanal,hasbeenbuilttocontrolfloodingandprovidehydro-electricpowerforthecentralregionofChina.继长城和大运河之后,最大的建筑工程—三峡大坝被建造以控制洪灾并为华中地区提供电力。定语从句分为限制性定语从句和非限制性定语从句两种。限制性定语从句紧跟先行词,与先行词之间一般不加逗号;非限制性定语从句与主句之间通常用逗号分开,是先行词的附加说明，去掉了也不会影响主句的意思。引导非限制性定语从句的关系代词有as,which,who,whom,whose等，作定语从句的主语、宾语、定语。关系副词有when,where等，作定语从句的状语。关系代词和关系副词在定语从句中一般不能省。1.I’mtakingweight-losspillscalledFat-Less,whicharequitepopularamongyoungwomenhere.2.Mymother,whomyoumetlastyear,keepstellingmenottotakethembecausetheyaredangerous.3.Thenthedoctorfoundsomeoneinyourcountry,whosenameisLiDong,wasanexactmatchforme.4.It’sthesameinChina—manypeople,someofwhomarenotoverweightatall,arealwaysgoingondietortakingweight-losspills,whichareoftendangerous.DifferencesbetweentheAttributiveClausesandNon-definingAttributiveClauses.Lookatthefollowingsentencesandtellthedifferencesbetweenthem.1.Hisfather,whoworksinBeijing,camebackyesterday.2.Shanghai,whichisinEastChina,isdevelopingquickly.Conclusion1Conclusion1当先行词是地名、人名、世界上独一无二的事物或家庭唯一成员时，通常只用非限制性定语从句修饰。1.Ihaveasisterwho/thatworksinahospital.我有一位在医院工作的姐姐。2.Ihaveasister,whoworksinahospital.我有一位姐姐,她在医院工作。3.Themagazinesherewhich/thathavenicepicturesinthemwerewrittenbyhim.里面有漂亮图画的那些杂志是他编写的。4.Themagazineshere,whichhavenicepicturesinthem,werewrittenbyhim.所有的杂志都是他编写的,里面都有漂亮的图画。Conclusion2Conclusion21.限制性定语从句与先行词关系密切,是先行词不可缺少的部分,如果去掉它,主句意思往往不明确。2.非限制性定语从句是对先行词的补充或说明,去掉它也不会影响主句的意思。1.Thisisthehouse(which/that)weboughtlastmonth.这是我们上个月买的那幢房子。2.Thehouse,whichweboughtlastmonth,isverynice.这房子很漂亮,是我们上个月买的。3.HeseemsnottohavegraspedwhatImeant,whichgreatlyupsetsme.他似乎没领会我的意思,这使我心烦。Conclusion3Conclusion31.限制性定语从句可以由关系代词,关系副词来引导,关系代词作宾语时可以省略。2.非限制性定语从句既可修饰先行词,又可修饰整个主句,不可用that引导且关系代词不可以省略。1.Thefamousbasketballstar,____comesfromAmerica,willvisitourschoolsoon.2.Inthosedays,sheusedtogotoMrblack,with______shehadawonderfultime.3.Iboughtacaryesterday,_____costmealot.whichwhomwho4.Xi’an,______Ivisitedlastyear,isaniceoldcity.5.HewillcometoseemenextJuly,_____hewon’tbesobusy.6.Theschool,______Ioncestudied,wasbuiltthirtyyearsago.whichwherewhen7.Johnsaidhe’dbeenworkingintheofficeforanhour,_____wastrue.8.__weallknow,heisgoodatEnglish.Aswhich1.as和which在引导非限制性定语从句时,as和which可代替整个主句,相当于andthis或andthat。这两个关系代词都可指代主句所表达的整个意思,且在定语从句中都可以作主语和宾语。2.as和which引导非限制性定语从句的不同之处在于:(1)as引导的定语从句可置于句首,而which引导的定语从句不可放在句首。(2)as代表前面的整个主句并在从句中作主语时,从句中的谓语必须是系动词;若从句中的谓语为...
