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1、1.表示原因的thereason后常用关系副词whyforwhich引导定语从句.eg：ThatsthereasonwhyIaskedyoutocome.Idontknowthereasonwhyshewaslate我不知道她为什么迟到了这就是我叫你来的原因2.where引导定语从句时,where是关系副词,在从句中作地点状语,其前面有表示地点的先行词,where引导的从句修饰先行词。theplace,thehousewhere=at/in/onwhichWewillstartatthepointwhereweleftoff.我买这本书的那个书店离这里不远。这就是我两年前住的那个房子。我们将从
2、上次停下来的地方开始。ThebookshopwhereIboughtthisbookisnotfarfromhere.eg:ThisisthehousewhereIlivedtwoyearsago.4.When引导的定语从句修饰表示时间的名词，并在定语从句中作时间状语。如thetime,everytime,eachtime,themoment等。eg：Bythetimehewasfifteenyearsolds,hehadlearnedthreeforeignlanguages.Westillrememberedthedayswhenwetravelledtogether到十五岁时，他已经学习
3、了三门外语。我们始终记得我们一起旅游的那些日子*3.当case,point,stage,condition,position,situation等词为先行词时，其后常用where引导的定语从句。eg：Whocanthinkofasituationwherethisphrasecanbeused？事故发生在两条路的交叉口Theaccidenthappenedatthepointwheretworoadsmeet.谁能想出这个短语在哪种情况下可以使用？注意：当先行词虽然表示时间、地点或原因，而关系词在从句中作主语、宾语而不是状语时，不可用when,where或why，而应用that或which。如
4、：ThisisthehousewhichIlivein.Illneverforgetthedaywhichwespendtogether.这是我住的那间房子我永远不会忘记我们一起度过的那一天1.WheneverImether,_wasfairlyoften,shegreetedmewithasweetsmile.A.whoB.whichC.whenD.that2.Shebroughtwithherthreefriends,noneofIhadevermetbefore.1.A.themB.whoC.whomD.these2.3.Becauseofthefinancialcrisis,daysaregone_local5-starhotelscharged6,000yuanforonenight.3.A.ifB.whenC.whichD.since4.4.Aperson_e-mailaccountisfullwontbeabletosendorreceiveanye-mails.5.A.whoB.whomC.whoseD.whoever