第四单元语法-主语从句-公开课.ppt

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1、TrytofindoutthesubjectBeijingisourcapital.2.Youareastudent.3.Smokingisbadforyou.4.Tofindyourwaycanbeaproblem5.“Howdoyoudo?”isagreeting6.ItiscertainthatweshallbelateReadthesentencesfromthetextandpayattentiontotheunderlinedparts.1.Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsago…2.…it

2、wasnotclearwhethertheshapewouldlastornot.3.Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearonitssurface.4.Whatmanyscientistsbelieveisthatthecontinuedpresence…5.Whytheysuddenlydisappearedstillremainsamystery.主语从句主语从句主语从句是在复合句中充当主语的从句，其功能同名词一样。常见连接词引导词词性在从句中作成分Thatwhether连词不作成分What

3、whowhich连接代词主语宾语Whenwherehowwhy连接副词状语Whateverwhoeverwhichever复合代词主语宾语Wheneverhoweverwherever复合副词状语连词1.Thattheyweretruesisterswasclearfromthefacialresemblancebetweenthem.2.Whetherhe’llcomehereisn’tclear.连接代词，复合代词1.Whatshedidisnotyetknown2.Whoevercomesiswelcome连接副词，复合副词：1.Howthishappenedisnotcleartoan

4、yone2.Whentheplaneistotakeoffhasnotbeenannounced.为了避免头重脚轻，常用it作形式主语,而把真正主语放在句子末尾。Thatheisthebeststudentintheclassisobvious.=Itisobviousthatheisthebeststudentintheclass.注意事项1.主语从句用陈述语序，关联词位于句首不能省略Whothewatchbelongstoisunknown.Thathefinishedwritingthecompositioninsuchashorttimesurprisedusall.在主语从句中，谓语

5、动词一般用单数。Whateverhesaysisofnoimportance.Whoeversaysthisiswrong但谓语动词用单数还是复数，不可一概而论，而要视句子的意义而定WhatIneedismoney.WhatIneedarebooks2.what与that在引导主语从句时的区别what引导主语从句时在从句中充当句子成分，如主语、宾语、表语，而that则不然。Whatyousaidyesterdayisright.Thatsheisstillaliveisaconsolation.3.whether与ifwhether引导主语从句时,常置于句首(此时whether不能用if代替)

6、,也有后移的用法(此时whether可以用if代替)Whethertheywillcomeisnotyetknown.Itisnotyetknownwhether/iftheywillgothere.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，主语从句的连接词没有变化。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。被强调部分指人是也可用who/whom。Itisstillamysterywhatcausedtheaccident.Itisamysterythathisdeathremained.Itis＋名词

7、＋从句Itisafactthat…事实是…Itisanhonorthat…非常荣幸Itiscommonknowledgethat…是常识(2)Itis＋形容词＋从句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)It＋过去分词＋从