名词性从句课件.pptVIP

名词性从句Whowillwinthematchisstillunknown.Iwanttoknowwhathehastoldyou.Thefactisthatwehavelostthegame.Thenewsthatwewonthegameisexciting.主语从句宾语从句表语从句在句子中起名词作用的句子叫名词性从句。名词性从句的作用相当于名词（短语），在复合句中能做主语、表语、宾语和同位语。同位语从句引导名词性从句的连接词可分为三类：连接词：that,whether,if连接代词：what,whatever,who,whoever,whom,whomever，which，whichever，whose.连接副词：when,where,how,whythat只起连接主句和从句的作用，在从句中不担任任何成分，本身也没有词义，宾语从句中有时可省略引导主语从句、表语从句和同位语从句时that不可省略一．主语从句主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而主从放在句子末尾。1.连接代词who，what，which,whatever,whichever,whoeverWhatisneededforsuccessisyourhardwork.Whowilltakepartinthemeetinghasnotbeendecided.Whoeverbreaksthelawwillbepunished.Whichstudentwillwinthefirstisuncertain.2.连接副词when，where，how，why等。Whytheysuddenlydisappearedstillremainsamystery.Whentheywillsetoffisnotdecided.Wheresheisfromisunknown.Howwewillpaintthehousehasnotbeendecided.3.从属连词：that，whether等.that引导主语从句只起引导作用，本身无实际意义，在主语从句中不充当任何成分，但不能省略。Thatpeoplecutdowntoomanytreesdestroyedthebalanceofnature.Whetheritwillrainornotisnotclear.Itwasnotclearwhether/ifthesolidshapewouldlast.引导主语从句在句首只能用whether,有it作形式主语的whether/if都可以.注意:由that引导的主语从句有时为了使句子结构平衡,避免“头重脚轻”,常用it作形式主语,而把从句放在后面。例如:1.Thathewillrefusethispieceofadviceisimpossible.______________________________________________________________________________2.Thattheyshouldlikeeachotherisnatural._____________________________________*it为形式主语Itisnaturalthattheyshouldlikeeachother.Itisimpossiblethathewillrefusethispieceofadvice.这样就构成了下面一些常用句型:1)Itis+n.+从句Itisapity/shamethat...遗憾的是……Itisasurprisethat…令人惊奇的是…Itisafactthat……是事实Itiscommonknowledgethat……是常识Itisnowonder/nosurprisethat....*_______________(很遗憾)welostthemat