定语从句一.当关系词在定语从句中做状语时，要用关系副词。其中when=表时间的介词（in/on/at/during等）+which;why=表原因的介词（如for)+which;where=(表地点的介词in/on/at/under等）+which.如；IstillrememberthedaywhenIfirstcametoBeijing.(when=onwhich)Canyoutellmetheofficewhereheworks?(where=onwhich)Doyouknowthereasonwhyheisabsent?(why=forwhich)二.where/when=介词+关系代词（which)有时为了表达清楚，还可以在关系副词where/when前加介词from/to等。Chinaisthebirthplaceofkites,fromwhereKiteflyingspreadstoJapan,Korea,ThailandandIndia.Lookoverthere.Somepeoplearestandingunderthebigtree,fromwhereweenjoythewholeview.分析：where代表underthebigtree这个地方，如果用which就只能代表thebigtree,这句话的意思不是Enjoytheviewfromthebigtree而是fromunderthebigtree所以只能用fromWhereSheclimbeduptothetopofthehill,fromwhereshecouldhaveagoodviewofthewholetown.(fromwhere=fromonthetopofthehill)Alicestoodinfrontofthewindow,fromwhereshecouldwatchherclassmatesplayingbasketball.(fromwhere=frominfrontofthewindow)Wewentuptotheroof,fromwherewehadagoodviewoftheprocession（游行队伍）（fromwhere=fromonthetopoftheroof)三.关系副词可用于非限制性定语从句中而关系副词why不可以。四.高考对关系副词where的考察高考试题中队where的考察趋于复杂，从先行词为明显的“地点”转为“模糊化的地点”。事实上，对于where这个词不能只理解为标地点。当先行词为situation/case/stage/point等，且先行词在定语从句中做状语时，也要用关系副词where引导。Theyhavereachedthepointwheretheyhavetoseparatewitheachother.Let’sthinkofasituationwherehisidiomcanbeused.IhavereachedapointinmylifewhereIamsupposedtomakedecisionsofmyself.Thosesuccessfuldeafdancersthinkthatdancingisanactivitywheresightmattersmorethanhearing.四.关系代词和关系副词的比较关系代词和关系副词在定语从句中除了其连接主句和从句的作用外，他们换在定语从句中担当句子成分。关系代词在定语从句中担当主语，宾语，定语、表语，而关系副词在定语从句中作状语。因此，在选择关系词时最主要的是分析定于才能根据中所缺的成分，如果从句中缺少主语，宾语，定语，表语就选关系代词，如果缺少状语就选关系副词。比较下列句子Doyoustillrememberthedaythat/which/不填wespentinQingdao?DoyoustillrememberthedaywhenwespentthesummerholidayinQingdao?题组训练用that/which/when/where/why填空1.Iwanttoknowthedate_____youwereborn.2.Ihaveforgottenthedate______youtoldme3.Doyouknowthereason______heisabsentToday.4.Thisisthefactory_____hisfatherworks.5.Thisisthefactory______hisfatherbuilt.五.定语从句用法的其他要点1.定语从句中的谓语动词的单复数形式与先行词的单复数形式要保持一致。（1）oneof+复数