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名词性从句练习定语从句难点讲解一、理解概念：1.定语从句：在复合句中，起定语作用，修饰名词、代词或整个主句的从句。2.先行词：被定语从句修饰的名词或代词。3.关系词：引导定语从句的关系代词或关系副词。关系词类别关系词先行词充当从句的句子成份关系代词who人主、宾、表whom人宾which物主、宾、表that人或物主、宾、表as人或物主、宾、表whose人或物定关系词类别关系词先行词充当从句的句子成份关系副词when时间词状where地点词状whyreason状二、关系词的用法关系词通常有三个作用1.引导定语从句2.指代先行词3.在定语从句中充当句子成分。关系词关系副词when指时间，在定语从句中作时间状语where指地点，在定语从句中作地点状语why,指原因，在定语从句中作原因状语关系代词不用that不用whichaswhichthatwho/that—人who,which,that作主语that/which—物whom,which,that作宾语whose作定语（人，物）1.先行词为不定代词或不定代词修饰时2.先行词有最高级或序数词修饰3.先行词有theonly,thevery,thelast等词修饰4.先行词既有人又有物5.who,that开头的句子引导非限制性定语从句代表某先行词或整个主句的意思介词+关系代词such…as…thesame…as….,thesame….that…定语从句关系词一览表四、如何选择关系词欠主语、宾语或表语任一个选择关系代词分析定语从句不欠主语、宾语、表语任一个看先行词时间—when地点—wherereason—why※AttentionHestilllivesintheroom___isinthenorthofthecity.Hestilllivesintheroom___thereisabeautifultable.A.whichB.whoseC.whereD.ofwhichI’llneverforgetthedays___westudiedtogether.I’llneverforgetthedays___wespenttogether.A.thatB./C.whenD.AandBACCD1.I’moneofthestudentswho____wellinEnglishinmyclass.2.Heistheonlyoneofthethreestudentswho___gotthenewidea.A.doesB.doC.hasD.haveBCas/which引导定语从句时的区别：相同点：as和which都可以代替一个句子1.Asisknowntoall,Chinaisadevelopingcountry.(as=Chinaisadevelopingcountry,)2.Hewaslateagain,whichmadehisteacherangry.(which=hewaslateagain)as/which引导定语从句时的区别：as：放句首，句中间，“正如…”“就象…”，表示方式多一点，表示种类/现象（判断），前、后的主、从句语义一致时，用aswhich：只能放句中间，不能放句首，“这点…”“这种情况…”，表示因果关系，表示具体某一种情况。注：1.as作主语时，后面常常接行为动词的被动语态，如果定语从句中行为动词是主动语态，一般须用which作主语。例如：asisknown/said/reported/announcedShehasbeenlateagain,aswasexpected.Tomhasmadegreatprogress,whichdelightedus.2、定语从句的谓语动词带（复合结构）即带宾语补足语且位于句末时，用which引导。Hewaslateagain,whichmadetheteacherangry.(宾补)3、定语从句有否定句时，用which引导。TomalwayswantstohelpMary,whichshedoesn’tlikeatall.4、主句与从句一致时用as，主句与从句不一致，则用whichShehasmarriedagain,whichwasunexpected.5.Shehasmarriedagain,aswasexpected6.asisknown/said/reported/announcedashasbeensaidbefore如上所述asoftenhappens正如经常发生的那样asiswellknowntoall众所周知asmaybeimaginedasweknow众所周知asisoftenthecase常有的事aswehadexpected正如我们所预料的那样