定语从句I.定语从句起了形容词的作用，在句中修饰一个名词或代词。被修饰的词叫做先行词，引导定语从句的词叫关系词，他的作用一是放在先行词与定语从句中间起了连接作用，二是在从句中担当一个成分，并与先行词保持数的一致。关系词先行词从句成分例句备注关系代词who人主语Doyouknowthemanwhoistalkingwithyourmother?whom,which和that在从句中做宾语时，常可以省略，但介词提前时后面关系代词不能省略，也不可以用thatwhom人宾语Mr.SmithisthepersonwithwhomIamworkingTheboy(whom)sheloveddiedinthewar..whose人，物定语Ilikethosebookswhosetopicsareabouthistory.Theboywhosefatherworksabroadismydeskmate.that人，物主语，宾语Aplaneisamachinethatcanfly.Sheisthepopstar(that)Iwanttoseeverymuch.which物主语，宾语Thebook(which)Igaveyouwasworth$10.Thepicturewhichwasabouttheaccidentwasterrible.as人，物主语，宾语Heissuchapersonasisrespectedbyallofus.ThisisthesamepenasIlostyesterday.as做宾语一般不省略关系副词when时间时间状语Iwillneverforgetthedaywhenwemetthere.可用onwhichwhere地点地点状语ThisisthehousewhereIwasborn.可用inwhichwhy原因原因状语Ican’timaginethereasonwhyheturneddownmyoffer.可用forwhichwho:站在那里的那个高个子是我的班主任。Thetallmanwhoisstandingthereismyheadteacherwhom:刚才和我连天那个男人是我的父亲。ThemanwhomItalkedtojustnowismyfather.whose:绿色封面的那本书是英语书。ThebookwhosecoverisgreenisanEnglishbook那些是我在北京买的明信片。Thesearethepostcards(that)IboughtinBeijing.Which:那本讲述电影的书很有趣。Thebookwhichtalksaboutfilmsisveryinteresting.when:我永远不会忘记我初次遇见吉姆的那一天。IwillneverforgetthedaywhenImetJimforthefirsttimewhere:那是汤姆出生的地方。That’stheplacewheretomwasbornwhy:你知道他们迟到的原因吗？Doyouknowthereasonwhytheywerelateforthemeeting?II.that与which,who,whom的用法区别：情况用法说明例句只用that的情况1．先行词为all,everything,anything,nothing,little,much,等不定代词时。2．先行词被all,any,every,each,much,little,no,some,few等修饰时3．先行词有形容词最高级和序数词修饰时4．先行词既指人又指物时5．先行词被theonly,thevery修饰时6．句中已经有who或which时，为了避免重复时1.Hetoldmeeverythingthatheknows.2.Allthebooksthatyouofferedhasbeengivenout.3.ThisisthebestfilmthatIhaveeverread.4.Wetalkedaboutthepersonsandthingsthatweremembered.5.HeistheonlymanthatIwanttosee.6.Whoisthemanthatismakingaspeech?只用which,who,whom的情况1．在非限制性定语从句中，只能用which指代物，用who/whom指人2．在由“介词+关系代词”引导的定语从句中，只能用which指物，whom指人。3．先行词本身是that时，关系词用which,先行词为those,one,he时多用who。Hehasason,whohasgoneabroadforfurth