B4U4 grammar.高一英语必修四语法主语从句.ppt

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1、GrammarUnit4Astronomy:thescienceofthestars1)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、？2.有什么引导词可以引导主语从句？主语从句太长时一般如何处理？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

3、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。Wh

4、etherIcanpasstheexamisunknown.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Itisnat

5、uralthattheyshouldlikeeachother.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.Itisapity

6、thatItisafactthat2)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/happe

7、n/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……

8、Itisreportedthat...据报道……*___________________(据报道)20peoplewerekilledintheaccident.*______________________(建议)weshouldeatmorevegetableanddomoreexercise.It