定语从句讲解和练习一、概念:Heistheboywhooftengoestoschoollate.先行词关系词定语从句二、原则：a.定语从句必须紧紧地跟在先行词后面，限制修饰先行词。b.定语从句必须用关系词来引导。c.关系词在定语从句中作一个句子成分.三、扩大.SheistheoldwomanwhomIsawthismorning.MaryisthegirlwhoseparentsworkinJapan.Isthisthekeywhichyouarelookingfor?October1,1949isthedaywhenNewChinawasfounded.Thisisthehousewherethegreatmanwasborn.Idon’tknowthereasonwhyshelooksunhappytoday.四、下列定语从句只能用that来引导：1.先行词为形容词最高级所修饰ThisisthelongestbridgethatIhaveeverseen.2.先行词为序数词所修饰Ihappenedtobethethousandthguestthatvisitedthegreathotel.ThisisthefirstcompositionthathehaseverwritteninEnglish.3.先行词既包括人又包括物Theytalkedofthingsandpersonsthathappenedintheschool.Hetalkedabouttheteachersandschoolsthathehadvisited.4.主句是who或which开头的特殊疑问句中的定语从句Whoisthemanthatcamethismorning?Whichisthebagthatyoulost?5.先行词为theonly,thevery,thelast,thesame所修饰的定语从句Heistheverypersonthatthepolicearelookingfor.ThisistheonlythingthatIcanremember.6.先行词是everything,nothing,something,all,little,much,everybody等不定代词Telluseverythingthatyouknow,please.Isthereanythingthatyoudon’tunderstand?7.先行词被all,every,no,some,any,little,much修饰时Allthatglittersisnotgold.I’vereadallthebooksthatyougaveme.五、“介词+关系词”及关系副词when,where,why1).Theboxisfullofbottles.Heisstandingonthebox.---->Theboxonwhichheisstandingisfullofbottles.Theboxwhereheisstandingisfullofbottles.2).Thisisthetrain.Weworkonthetrain.---->Thisisthetrainonwhichwework.Thisisthetrainwherewework.3).Iknowthereason.Shediditforthereason.---->Iknowthereasonforwhichshedidit.Iknowthereasonwhyshedidit.4).Themanisourschoolmaster.Youshookhandswiththemanjustnow.---->Themanwithwhomyoushookhandsisourschoolmaster.5).ThepenismadeinShanghai.Sheiswritingwiththepen.---->ThepenwithwhichsheiswritingismadeinShanghai.不能拆开的词组：lookfor/lookafter/catchholdof/takecareof/puton/takeoff⋯⋯.六、非限制性定语从句只对先行词起补充，说明的作用，常用逗号分开。关系代词用who(m),which，关系副词用where,when.非限制性定语从句不能用that来引导.ThiswastheAmericanCivilWar,whichlasted4yearsbeforetheNorthwonintheend.Hewastakentoanotherroom,wherehefoundawoundedboy,whowasdying.七、as作为关系代词，习惯上用于下列词组：thesame....assuch...asas...as，so⋯as1.Takeasmanybooksasyouwant.2.Hereissobigastoneasnomancanlift.3.Hereadsuchbooksaswillmakehimwiser.4.ThetownisaboutthesamedistancefromNanjingasYangzhouis.As用于非限制性定语从句，常见以下句型：asyouknow,aswehaveseen,asisknowntoall,asanybodycansee,aswasexpected,aswecanimagine,ashasbeenpointedoutas与which的用法区别：as与which在非限制性定语从句中，都可指代整个主句，但as引导的从句可放在主句的句首,句中或句尾，而which引导的从句只可放在主句的句尾Aswehaveseen,oceanscovermorethan70percentoftheearth.Oceanscovermorethan70percentoftheearth,aswehaveseen.Shewasawardedagoldmedal,whichthewholefamilyconsideredagreathonour.八、thesame⋯as,thesame⋯that的区别ThisisthesamebagasIlostyesterday.（相似的事物）IamwearingthesamecoatthatIworeyesterday.（同一事物）九、定语从句和同位语从句的区别:定语从句相当于形容词作定语，对先行词加以限制或修饰，同位语从句相当于名词，对先行词加以补充或说明，连接词that在定语从句中充当某个成分，而that在同位语从句不充当句子成分.Thepromisethatmyunclegavememadeushappy.（定语从句）Thepromisethatmyunclewouldgivem...
