高中英语主语从句.doc

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1、Unit3主语从句(BookIII)ByWangHaiyan主语从句定义：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，而本身放在句子末尾。引导主语从句的有连词that，whether，if，连接代词who，what，which，连接副词when，where，how，why等。1．从属连词：that，whether，if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。Whether,if“是否”。Thatpeoplecutdowntoom

2、anytreesdestroyedthebalanceofnature.Whetheryoucansignuponlineisnotcertain.Whetherwecanhaveasportsmeetornotwasnotclear.Itwasnotclearwhetherwecanhaveasportsmeetornot.Conclusion: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

3、语,而把从句放在后面。例如:1.Thathewillrefusethispieceofadviceisimpossible._________________________________________________________________________2.Thattheyshouldlikeeachotherisnatural._____________________________________这样就构成了下面一些常用句型:1)Itis+n.+从句　Itisapity/shamethat...遗

4、憾的是……　Itisasurprisethat…令人惊奇的是…　Itisafactthat……是事实Itiscommonknowledgethat……是常识*_______________(很遗憾)welostthematch.*______________(这是事实)hecheatedintheexam.2)Itis+adj.+从句　It’scertainthat…肯定…　Itispossiblethat...很可能……　Itisunlikelythat...不可能……Itisobviousthat…很明显…Itis

5、necessaryimportantatural...that…*_________________(很可能)shewillcomebacktomorrow.*_________________(肯定)wecanpasstheexam.主语从句的虚拟语气①表“应该，惊讶、惋惜、遗憾”等意义Itisimportant/natural/necessary/impossible/strangethat...谓语形式为:should+V.原形,should可省略。eg.很奇怪，他竟没有来。Itisstrangethat

6、___________________.我们做足够的运动很重要。重要的是我们应该做足够的运动Itisimportantthatweshoulddoenoughsports.②表示“据建议、据要求、据命令”It+be+suggested/advised/ordered/requested/commanded/insisted/requiredthat…谓语形式:should+V.原形,should可省略.据命令，所有乘客必须接受搜查___________________allthepassengers__________

7、___________.3)It+不及物动词+从句Ithappenedthat...碰巧……Itoccurredtomethat…我突然想起…*________________(刚好)Icameintotheofficeatthattime.*____________________(我突然想起)Iforgettosenttheletter.4)It+be+过去分词+从句Itissaidthat...据说……Itisknowntoallthat...众所周知……Itisreportedthat...据报道……Itisb

8、elievedthat...据信……;人们相信……Itissuggestedthat+(should）do...建议……Itmustbeadmittedthat…必须承认……Itcannotbedeniedthat…不可否认……　　Itmustbepointedoutthat…需指出的是……　*__________________