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1、名词性从句NounClauses在英语的句子结构中，本来该由名词充当的主语、宾语、表语和同位语，由一个句子来充当,这个句子就叫名词性从句。什么是名词性从句?名词性从句主语从句(TheSubjectClause)宾语从句(TheObjectClause)表语从句(ThePredicativeClause)同位语从句(TheAppositiveClause)1.Whenwewillstartisnotclear.2.MrsBlackwon’tbelievethathersonhasbecomeathief.3.Myideaisthatweshoulddoitrightnow.4.Ihadno
2、ideathatyouwereherfriend.主语从句宾语从句表语从句同位语从句I名词性从句的种类主语从句在复合句中作主句的主语.引导词有连词that(that不可省略),whether;连接代词有who,what,which;连接副词when,where,how,why等.如:1).连接词:that,whetherHeisafamoussinger.Itisknowntous.1.Thatheisafamoussingerisknowntous.(Itisknowntousthatheisafamoussinger.)WillwevisittheGreatWalltomorrow?
3、Ithasnotbeendecided.WhetherwewillvisittheGreatWallhasnotbeendecided.IthasnotbeendecidedwhetherwewillvisittheGreatWall.2).连接代词:who,whom,whose,what,which,whoever,whatever,whicheverWhosebagisit?Itcan`tbetold.Whosebagitiscan`tbetold.Itcan`tbetoldwhosebagitis.Whatdoesheneed?Itismoney.Whatheneedsismone
4、y.无论你刚才说什么都是对的.Whateveryousaidisallright.3).连接副词:when,where,why,how,howmany,howmuch,howlong,howsoon,howoftenWhenwillwestarttomorrow?Itwillbetoldsoon.Whenwewillstarttomorrowwillbetoldsoon.我们将怎样制定计划已经被老师解释清楚了.Howwewillmaketheplanhasbeenexplainedclearlybytheteacher.为什么他来这里还是不被人所知道.Whyhecomeshereisno
5、tknown.1.为什么有时侯用that,whether,有时侯用连接代词,或着有时候用连接副词?2.它的语序有没有变化?2.总结:1).主语从句一律用陈述句语序,即主语在前,谓语在后.2).连接词that在从句中无实际意义,起引导作用,不作任何成分,但不能省略.Whenwillhecomeisnotknown.错误Whenhewillcomeisnotknown.Hewillnotcometothemeetingthiseveningistrue.错误Thathewillnotcometothemeetingthiseveningistrue.但是whatisthematter和wha
6、tiswrong不可改变语序3).whether可以引导主语从句解释为”是否”,但if不能.4).whoever,whatever,whichever等词可以引导主语从句,但nomatterwho,nomatterwhat等不能,它们只能引导让步状语从句.5).为避免主语冗长,句子头重脚轻,经常用it作形式主语,主语从句放在后面作真正的主语.例:Itiswellknown/reported/thought/said/…that…Itisclear/necessary/certain/true/doubtful/…that…Itisapity/ashame/anhonour/…that…I
7、tdoesn’tmatterwhether…/Itseemsthat…Ithappensthat…单个的主语从句作主语时，谓语动词用单数形式。如果是两个或两个以上的主语从句作主语，谓语动词则用复数形式。Whereandwhenhewasbornhasnotbeenfound.Whenthepersonwasmurderedandwhyhewasmurderedarestillunknown.注意:在主语从句中用来表示惊奇、不相信、惋
