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1、表语从用法1.定义:用作表语的从句叫做表语从句2.引导表语的从句的关联词的种类(1)从属连词that.ThetroubleisthatIhavelosthisaddress.Thereasonwasthathewaslateforschool.(2)从属连词whether,as,asifHelookedjustashehadlookedtenyearsbefore.Thequestioniswhethertheywillbeabletohelpus.注:从属连词if一般不用来引导表语从句,但asif却可引导表语从句。Allthiswasovertwentyyearsago,buti
2、t’sasifitwasonlyyesterday.Thekeyiswhetherwecansolvetheproblem.Itlookedasifitwasgoingtorain.注:能跟表语从句的谓语动词一般为系动词be,seem,look,sound等Helookedjustashehadlookedtenyearsbefore.Itsoundsasifsomeoneisknockingatthedoor.(3)连接代词who,whom,whose,what,which,whoever,whatever,whichever在表语从句中做主语、宾语等。Theproblemisw
3、howecangettoreplaceher.Thatwaswhatshedidthismorningonreachingtheagreement.Myquestioniswholeft.(4)连接副词where,when,how,whyWhatIwonderiswhenheleft.Thisiswheretheyoncelived.Thatiswhyhedidn’tcomehere.Thequestionishowhedidit.(5)连词because可引导表语从句。注意:because可引导表语从句,但与之同义的since,as,for等不用于引导表语从句。Ithinkiti
4、sbecauseyouaredoingtoomuch.It’sjustbecausehedoesn’tknowher.That’sbecausehedidn’tunderstandme.(That’sbecause…强调原因)That'swhyhegotangrywithme.(That’swhy…强调结果)注意:在一些表示“建议,劝说,命令”的名词后面的表语从句中,谓语动词用虚拟语气.Should+动词原形表示,should可省略。Mysuggestionisthatwe(should)startearlytomorrow.一坚持(insisit)二命令(command,orde
5、r)三建议(suggest,advise,propose)四要求(desire,demand,require,request)四.注意事项(重点看)1.表语从句要用陈述语序。Thatiswherethefamousscientistwasborn.Thisiswhysheissohappytoday.2.that和what在引导的表语从句that本身没有词义,在句中只起连接作用,不充当句子成分;what则表示“所…的(人或事)”,在表语从句中充当主语或宾语等。Thatfacetisthatmorethanseventypercentoftheearth’ssurfaceiscove
6、redbywater.Whathetoldyouwaswhathadbeendiscussedatthemeeting.2.if与whether均意为“是否”引导的表语从句是,只能用whether,不能用if。Thequestioniswhetherwecanfinishourworkbytomorrowevening.3.语气(1)主语为advice,order,idea,notion,proposal,suggestion,request等一些表示“建议,劝说,命令”的名词,之后的表语从句中,谓语动词用虚拟语气。Should+动词原形表示,should可省略。Mysuggest
7、ionisthatwe(should)startearlytomorrow.Ouronlyrequestisthatthisshouldbesettledassoonaspossible.(2)asif/though引导的表语从句时,从句谓语多用虚拟语气。这是因为从句中的情况与事实不相符。具体来说,如果从句表示与现在事实相反,谓语动词用一般过去式;如果从句表示与过去事实相反,谓语动词“had+done”,如果从句表示将来的可能性不大,用would(might,coul