英语必修三Unit4语法 主语从句讲解加练习课件.ppt

《英语必修三Unit4语法 主语从句讲解加练习课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Grammar主语从句主语从句：做主语用的名词性从句，因其在复合句中做主语，又称主语从句，引导主语从句的有连词that，whether，连接代词who，what，which，连接副词when，where，how，why等。1）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。Thathewillwiniscertain.他肯定会赢。Whetherhe’llcomehereisn’tclear.他是否会来这里还不清楚。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

2、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.Itisimpossiblethat

3、hewillrefusethispieceofadvice.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*_______________(很遗憾)welostthematch.*______________(这是事实)hecheatedintheexam.ItisapitythatItisafactthat2)Itis+adj.+从句It’scertainthat

4、…肯定…Itispossiblethat...很可能……Itisunlikelythat...不可能……Itisobviousthat…很明显…Itisnecessaryimportantatural...that…*_________________(很可能)shewillcomebacktomorrow.*_________________(很明显)thismeasureiseffective.+(should)+do…ItispossiblethatItisobviousthat3)It+不及物动词+从句Ithappenedthat...碰巧……Itoc

5、curredtomethat…我突然想起…*________________(刚好)Icameintotheofficeatthattime.*____________________(我突然想起)Iforgettosenttheletter.IthappenedthatItoccurredtomethat4)It+be+过去分词+从句Itissaidthat...据说……Itisknowntoallthat...众所周知……Itisreportedthat...据报道……Itisbelievedthat...据信……;人们相信……Itissuggestedthat+

6、(should）do...建议……Itmustbeadmittedthat…必须承认……Itcannotbedeniedthat…不可否认……Itmustbepointedoutthat…需指出的是……*___________________(据报道)20peoplewerekilledintheaccident.*______________________(建议)weshouldeatmorevegetableanddomoreexercise.ItisreportedthatItissuggestedthat2.连接代词who，what，which,whatev

7、er,whichever,whoever(Who,whom,which,what可以和ever构成合成词，和what一样引导从句，ever起到强调作用。此类主语从句不能用形式主语it引导，它们在句子中担任成分，不能省略，语序为陈述语序)Whatmanyscientistsbelieveisthattheearthisround…Whowilltakepartinthemeetinghasnotbeendecided.Whoeverbreaksthelawwillbepunished.Whichstudentwillwinisuncertain.Wha