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1、英语教学课件English高二下(选修7)Module2HighlightsofmySeniorYearGrammar1&2PredicativeClauses(表语从句)在复合句中用作表语的从句是表语从句,引导表语从句的关联词与引导主语从句的关联词大致一样,表语从句位于连系动词后,有时用asif引导。其基本结构为:主语+系动词+that从句。That’swhatweshoulddo.That’swhyIwanttoseeyou.表语从句的用法ThereasonformyabsencewasthatIwasill.be,seem,look等动词
2、后均可跟表语从句:如:Mysuggestionisthatweshouldgoshopping.Itseemsthatitisgoingtorain.2.asif,because也可引导表语从句。如:Itlooksasifit’sgoingtorain.ItwasbecauseIgotuplate.3.在非正式文体中,引导表语从句的that可以省略。如:Thetroubleis(that)heisill.在表语从句中,当reason做主语时,引导词只能用that,不能用because。如:他迟到的原因是因为他没有赶上早班车。Thereasonwhy
3、hewaslatewasthathedidn’tcatchtheearlybus.AttentionThattheearthisroundistrue.=Itistruethattheearthisround.主语从句的用法一、主语从句在句中作主语,主语从句可以位于句首,但常见的主语从句多放在句末,句首则用形式主语it。2.Whetherhewillcomehasn’tbeendecided.=Ithasn’tbeendecidedwhetherhewillcome.Attention:连词that,whether在从句中不担任句子成分,只起连接作
4、用,不能省略(注:if不可用来引导主语从句)。二.用it作形式主语的结构(1)Itis+名词+从句事实是……Itisafactthat………非常荣幸Itisanhonorthat………是常识Itiscommonknowledgethat…(2)Itis+形容词+从句(多用should)Itisnaturalthat…很自然……Itisstrangethat…奇怪的是……(3)Itis+不及物动词+从句Itseemsthat…似乎……Ithappenedthat…碰巧……Itappearsthat…似乎……(4)Itis+过去分词+从句Itisrep
5、ortedthat…据报道……Ithasbeenprovedthat…已证实……Itissaidthat…据说……三、It作形式主语和it引导强调句的比较It作形式主语代替主语从句,主要是为了平衡句子结构,主语从句的连接词有变化。而it引导的强调句则是对句子某一部分进行强调,无论强调的是什么成分,都可用连词that。被强调部分指人时也可用who/whom。例如:Itisapitythatyoudidn’tgotoseethefilm.Itdoesn’tinterestmewhetheryousucceedornot.Itisinthemorning
6、thatthemurdertookplace.ItisJohnthatbrokethewindow.学习主语从句应该注意的几个问题1)引导词that与whatwhat既有引导主语从句的作用,同时又在从句中作句子成分(主语、宾语、表语等),这时what相当于allthat/everythingthat...,常译成“所……的(东西、事情、话等.)”;而that只起连接作用,本身无实际意义,在从句中也不担当任何句子成分,但that引导的主语从句放在句首时,不能省略that。例如:(1)Whatwecan’tgetseemsbetterthanwhatw
7、ehave.(2)Thatweshouldworkoutaplantodealwiththeserioussituationisimportant.2)引导词if和whetherif和whether引导动词后的宾语从句时一般可通用,但介词后的宾语从句、主语从句(放在句首时)、表语从句常由whether引导。例如:Whethershewillgohomeornotisunknown.Itremainstobedecidedwhether/ifweshallraiseducksorgeese.【2012陕西卷】Asmanyfivecoursesarep
8、rovided,andyouarefreetochoose______suitsyoubest.A.whateverB.w