B4U4 grammar.高一英语必修四语法主语从句

Grammar1)Thathewillsucceediscertain.2)Whetherhewillgothereisnotknown.3)Whathesaidisnottrue.4)Howwecanhelpthetwinswillbediscussedatthemeeting.5)Itisimportantthatweshouldstudyhard.划出下面句子的主语并思考它们有什么共同点思考题共同点：都是在复合句中充当主语的从句。1.什么是主语从句？2.有什么引导词可以引导主语从句？3.主语从句太长时一般如何处理？4.主语从句的数和语序是怎样的？思考题主语从句语法归纳1)由that引导的主语从句that没有实在意义，不充当句子成分。主语从句就是从句在主句中作主语的名词性从句。Howwecanhelpthetwinswillbediscussedatthemeeting.Thatshelefthimhurtshimsomuch.*that只起引导作用，不充当成分，没有意思，但不能省2.引导主语从句的引导词1.什么是主语从句？主语从句语法归纳2)由wh-疑问词和how引导的主语从句用who，whom，which，whose，what，when，where，why，how，whoever，whatever等词引导的主语从句相当于特殊疑问句，连接词都在从句中充当一定的成分，包含意思，不能省略。注意句子要用陈述语序。Whenwewillbeginthemeetingisclear(清楚的).*When在从句中作状语2.引导主语从句的引导词主语从句语法归纳3)由whether引导的主语从句whether不充当句子成分，表示“是否”，一般可以和or，ornot连用。但if不能引导主语从句放在主句句首。WhetherIcanpasstheexamisunknown.2.引导主语从句的引导词注意: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:Thathewilllateforschoolisimpossible._______________________________________Thattheyshouldlikeeachotherisnatural._____________________________________*it为形式主语Itisnaturalthattheyshouldlikeeachother.Itisimpossiblethathewilllateforschool.3.主语从句太长时一般如何处理？这样就构成了下面一些常用句型:1)It+be+n.+从句Itisapitythat...遗憾的是……Itisasurprisethat…令人惊奇的是…Itisafactthat……是事实*_______________(很遗憾)welostthematch.*______________(这是事实)hecheatedintheexam.ItisapitythatItisafactthat2)It+be+adj.+从句Itiscertainthat…肯定…Itispossiblethat...很可能……Itisunlikelythat...不可能……Itisobviousthat…很明显…*_________________(很可能)shewillcomebacktomorrow.*_________________(很明显)thismeasureiseffective.ItispossiblethatItisobviousthat3)It+不及物动词(seem/happen/occur)+从句Ithappenedthat...碰巧……Itoccurredtomethat…我突然想起…Itseemsthat….似乎…*________________(刚好)Icameintotheofficeatthattime.*____________________(我突然想起)Iforgettosenttheletter.IthappenedthatItoccurredtomethat4)It+过去分词+从句Itissaidthat...据说……Itisknowntoallthat...众所周知……Itisreportedthat...据报道……*___________________(据报道)20peoplewerekilledintheaccident.*______________________(建议)weshouldeatmorevegetableanddomoreexercise.ItisreportedthatItissuggestedthatItisdecidedthat…据决定Itisbelievedthat…据认为a.Whenwillthemeetingbegin?b.Ithasnotbeendecided.Whenthemeetingwillbeginhasnotbeendecided.Whentheywillstartandwheretheygohavenotbeendecided.Whenandwherethemeetingwillbeginhasnotbeendecided.陈述语序4.主语从句的数和语序what引导名词性从句时在从句中充当句子成分,如主语,宾语,表语,而that则不然,它在句子中只起连接作用。例如：1.Whatyousaidyesterdayisright.2.Thatsheisstillaliveisapuzzle.what与that在引导主语从句时的区别1)_____sheisstillaliveisaconsolation（安慰）.2)_____helostthebikeworriedhimalot.3)_____causedtheaccidentremainsunknown.ThatThatWhat注意Practice1.______weneedismoretime.2.______hesaidatmeetingisimportant.3.______hecanpasstheexamremainsaquestion.=Itremainsaquestion______hecanpasstheexam.4._____we’llgocampingtomorrowdependsontheweather.5._____wewillhaveanexamnextmonthhasbeenannounced.WhatWhatWhetherWhetherWhetherThatPractice•1.我们需要的正是他的勇气和诚实。•__________________ishisbraveryandhonesty.•2.他什么时候来公司还不清楚。•__________________________isstillunknown.•3.昨晚发生了什么仍然是个迷。•____________________isstillamystery.WhatweneedWhenhewillcometothecompanyWhathappenedlastnight合并句子•Hehadn’tsaidanything.Itsurprisedus.•Howwasthebuildingbuilt?Itisstillamystery.•Whenhewillbeback?Itdependsontheweather.•Weshouldkeepabalanceddiet.Itisimportant.Thathehadn’tsaidanythingsurprisedus.Howwasthebuildingbuiltisstillamystery.Whenhewillbebackdependsontheweather.Itisimportantthatweshouldkeepabalanceddiet.