上海洛基国际英语--------本科学、专科高级英语——重点语法剖析系列十Andwecouldcalltheadministratorifweweretrappedinthelift.B:Ourmayeasilyinfluctuatingintheearthquake.Toavoidunnecessaryconfusion,weshouldkeepthecalmmindandmastertheinformationfromthegovernmentanddisasterpreventionmechanismbytheradio.Don’ttrustanyirresponsiblegossipandtakeanyirrationalaction.C:Thecarwouldbeoutofcontrolduringtheshakingsothatwecan’tgraspthesteeringwheel.Soweshouldparkthecarataroadsideassoonaspossible,avoidingthecrossroads.4.as与which用作关系代词的区别(1)as与thesame,such,so,as等关联使用。如：Astheforestgoes,sogoesitsanimallife.(2)as和which都可以引导非限定性定语从句，但as在句中的位置比较灵活，可出现在句首、句中、句末，而which只能出现在句末，尤其是当先行词是整个句子时。如：Asistrueinallinstitutions,juriesarecapableofmakingmistakes.Asisgenerallyaccepted,economicgrowthisdeterminedbythesmoothdevelopmentofproduction.常见的这类结构有：ashasbeensaidbefore,ashasbeenmentionedabove,ascanbeimagined,asisknowntoall,ashasbeenannounced,ascanbeseenfromthesefigures,asmight/couldbeexpected,asisoftenthecase,ashasbeenpointedout,asoftenhappens,aswillbeshown等。5.关系代词that与which用于引导定语从句的区别(1)如果关系代词在从句中做宾语，用that,which都可以，而且可以省略；(2)先行词是不定代词anything,nothing,little,all,everything时，关系代词用that；(3)先行词由形容词最高级或序数词修饰或由next，last,only,very修饰时，用that；(4)非限定性定语从句只能用which引导；(5)关系代词前面如果有介词，只能用which。6.but做关系代词，用于否定句，相当于who…not,that…not这个结构的特点是主句中常有否定词或含有否定意义的词。如：Therearefewteachersbutknowhowtouseacomputer.Thereisnocomplicatedproblembutcanbesolvedbyacomputer.十四、复合句——名词性从句一个句子起名词的作用，在句中做主语、宾语／介词宾语、表语、同位语，那么这个句子就是名词性从句。1.what/whatever的用法考生应把握：what是关系代词，它起着引导从句并在从句中担当一个成分这两个作用。如：Theylosttheirwayintheforest,andwhatmademattersworsewasthatnightbegantofall.(what既引导主语从句又在从句中做主语)Waterwillcontinuetobewhatitistoday—nextinimportancetooxygen.(what既引导表语从句又在从句中做表语)2.whoever和whomever的区别whoever和whomever相当于anyonewho，用主格与宾格取决于其在从句中做主语还是做宾语。如：Theyalwaysgivethevacantseatstowhoevercomesfirst.(whoever在从句中做主语)3.有关同位语从句的问题(1)下列名词常用做同位语的先行词：appeal,belief,conclusion,condition,conviction,doubt,evidence,fact,fear,feeling,ground(s),hope,idea,likelih