[编辑本段]介词和关系代词 　　1）介词后面的关系词不能省略. 　　2）that前不能有介词. 　　3）某些在从句中充当时间,地点或原因状语的"介词+关系词"结构可以同关系副词when,where和why互换.ThisisthehouseinwhichIlivedtwoyearsago. 　　ThisisthehousewhereIlivedtwoyearsago. 　　Doyourememberthedayonwhichyoujoinedourclub? 　　Doyourememberthedaywhenyoujoinedourclub? 　　Thisisthereasonwhyhecamelate. 　　Thisisthereasonforwhichhecamelate. 　　介词+关系代词引导的定语从句关系代词在定语从句中做介词宾语时 　　从句常由介词+关系代词引导 　　(1)Theschool(that/which)heoncestudiedinisveryfamous. 　　=Theschoolinwhichheoncestudiedisveryfamous. 　　(2)TomorrowIwillbringhereamagazine(that/which)youaskedfor. 　　=TomorrowIwillbringhereamagazineforwhichyouasked. 　　(3)We’llgotohearthefamoussinger(whom/that/who)wehaveoftentalkedabout. 　　=We’llgotohearthefamoussingeraboutwhomwehaveoftentalked. 　　注意： 　　1.含有介词的动词短语一般不拆开使用,如：lookfor,lookafter,takecareof等 　　TThisisthewatchwhich/thatIamlookingfor.(T＝正确) 　　FThisisthewatchforwhichIamlooking.(F＝错误) 　　2.若介词放在关系代词前,关系代词指人时用whom,不可用who或者that；指物时用which,不能用that；关系代词是所有格时用whose 　　(1)Themanwithwhomyoutalkedismyfriend.(T) 　　Themanwiththatyoutalkedismyfriend.(F) 　　(2)TheplaneinwhichweflewtoCanadaisverycomfortable.(T) 　　TheplaneinthatweflewintoCanadaisverycomfortable.(F) 　　3.“介词+关系代词”前可有some,any,none,both,all,neither,most,each,few等代词或者数词 　　(1)Helovedhisparentsdeeply,bothofwhomareverykindtohim. 　　(2)Inthebaskettherearequitemanyapples,someofwhichhavegonebad. 　　(3)Therearefortystudentsinourclassinall,mostofwhomarefrombigcities. 　　关系代词 　　关系代词（一般情况下）that可用who,whom和which在从句做主语,谓动词的宾语,但是不能做介词的宾语. 　　which指物,在从句中作主语,谓语或宾语； 　　who在从句中作主语； 　　whom在从句中宾语； 　　where在从句中修饰表地点的名词,做地点状语； 　　when在从句中通常修饰表时间的名词,做时间状语； 　　why在从句中做原因状语,先行词通常是"reason" 　　有时why也可用for+which代替. 　　例：Adoctorisapersonwholooksafterpeople'shealth. 　　_________________________________ 　　主语谓语先行词从句 　　|________________________| 　　定语从句修饰先行词 　　判断介词和关系代词 　　方法一：用关系代词,还是关系副词完全取决于从句中的谓语动词.不及物动词后面无宾语,就必须要求用关系副词或者是介词加关系代词；而及物动词后接宾语,则要求用关系代词.例如： 　　ThisisthemountainvillagewhereIstayedlastyear. 　　I'llneverforgetthedayswhenIworkedtogetherwithyou. 　　判断改错（注：先显示题,再显示答案,横线；用不同的颜色表示出.） 　　（错）ThisisthemountainvillagewhereIvisitedlastyear. 　　（错）IwillneverforgetthedayswhenIspentinthecountryside. 　　（对）Thisisthemountainvillage(which)Ivisitedlastyear. 　　（对）I'llneverforgetthedays(which)Ispentinthecountryside. 　　习惯上总把表地点或时间的名词与关系副词where,when联系在一起.此两题错在关系词的误用上. 　　方法二：准确判断先行词在定语从句中的成分(主、谓、宾、定、状),也能正确选择出关系代词/关系副词.例1.Isthismuseum___youvisitedafewdaysago? 　　A.whereB.thatC.onwhichD.theone 　　例2.Isthisthemuseum____theexhibitionwasheld? 　　A.whereB.thatC.onwhichD.theone答案： 　　例1D,例2A 　　例1变为肯定句：Thismuseumis___youvisitedafewdaysago.例2变为肯定句：Thisisthemuseum___theexhib