语法教学课件.ppt

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1、Unit4Astronomy:thescienceofthestarsLearningaboutlanguageNounclausesasthesubjectlifeisbeginning…Wewereborn…Wearegrowingup…motherForallthese,weshouldgivethankstoourmothers---becausetheygiveusourlives!Trytosaysomethingtoyourmothers.WhatImostwanttosayisthat…WhatIwanttoapol

2、ogizeisthat…Itisnecessarythat…(should)…Itisapitythat…Trytostartitwith:Completethesentenceonyourexercise.Discusswithyourpartnersinyourgroupandthenchooseonesentencethatyouallthinkisthebest.知识必备主语从句定义：在主从复合句中，充当主语的从句叫主语从句一、主语从句的连接词1、连接词that和whether（1）that在句中不充当成分，仅起连接作用，但

3、不能省略Thatshewaschosenmadeusveryhappy(2)whether在从句中不担任任何句子成分，意为“是否”Whetherwewillholdapartyintheopenairtomorrowdependsonthewhether.一、主语从句的连接词2、连接代词（who、whose、what、whatever等）eg：Whoheisisnotimportant.eg:Whathetoldmewastrue.3连接副词（when、where、how、why等）eg:Whenwewillstartoffisan

4、importantquestioneg:WhyJohndiditthiswaywasunexpected.二、主语从句中用it作形式主语的结构AIt+be+形容词（obvious、true、natural，etc）+that-clauseeg:Itiscertainthatshewilldowellinherexam.BIt+be+名词词组（nowonder、anhonor，etc）+that-clauseeg:It’snosurprisethatourteamshouldhavewonthegame.二、主语从句中用it作形式主语

5、的结构C.It+be+过去分词（said、reported、proved，etc）+that-clauseeg:IthasbeenprovedthatwhatyousaidisrightD.It+不及物动词（happen、seem、appear,etc）+that-clauseeg:Itseemsthathehaslostsomething.主语从句的注意事项1.从句的语序：在任何情况下，主语从句都用陈述语序。Whicheverofyougetsherefirstwillgettheprize.Howhesucceededissti

6、llapuzzle.2.主谓一致1）从句作主语，主句的谓语一般用单数形式；但what和who引导主语从句时，有时主句谓语的数应与主句中作表语的名词保持一致。Whattheyneedarebooks.Whattheyneedislove.主语从句的注意事项2)如果由and连接两个或两个以上的主语从句时，谓语动词用复数；由两个或多个连接词引导一个主语从句时，谓语动词用单数。Whentheywillstartandwheretheywillgohavenotbeendecidedyet.Whenandwherethemeetingwill

7、beheldhasnotbeendecided.主语从句的注意事项3)whether引导的主语从句，如果用了形式主语it,引导词whether可以换成if。如果whether从句在句首或后面直接跟有ornot时，不能用if替换。Whethertheywillsellthehouseisnotyetdecided.(此时whether与if不可互换)=Itisnotdecidedyetwhether/iftheywillsellthehouse.(此时whether与if可互换)2._______theycansolvetheques

8、tionisstillunknown.A.IfB.WhichC.WhetherD.What3._____hesaidatthemeetingastonishedeverybody.A.WhyB.WhatC.ThatD.Who4.___