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1、{Hisjobisimportant.Whathedoesisimportant.主语从句的定义：主语在句中充当主语的从句叫做主语从句。导SubjectClauses主语从句1.Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.2....itwasnotclearwhethertheshapewouldlastornot.3.Whatisevenmoreimportantisthatastheearthcooleddown,w
2、aterbegantoappearonitssurface.4.Itwasnotimmediatelyobviousthatwaterwastobefundamentaltothedevelopmentoflife.5.Whatmanyscientistbelieveisthatthecontinuedpresenceofwater...6.Whytheysuddenlydisappearedstillremainsamystery.7.Whetherlifewillcontinueontheearthformillionsofyearstocomewilldependo
3、nwhetherthisproblemcanbesolved.Task1:Findthesentenceswhicharesubjectclauseinthereadingpassage,thenunderlinethesubjectclauses.思从属连词that,whether，if连接代词who(ever),whom(ever),which(ever),what(ever)，whose连接副词where,when,why,howTask2：主语从句的引导词：考点一：连接词的选用[活学活用]①______weunderstandthingshasalottodowi
4、thwhatwefeel.【2015·北京】A.WhereB.HowC.WhyD.When②_____we'llgocampingtomorrowdependsontheweather.A.IfB.WhetherC.ThatD.Where③______we'llgocampingtomorrowhaskeptusallexcitedthewholeday.A.If B.Whether C.That D.Where④______makesmistakesmustcorrectthem.A.WhatB.ThatC.Whoever
5、D.Whatever议、展、评BCCB考点二：it作形式主语(1)It的用处：为了避免主语冗长和句子________,经常用it作________,主语从句放在____作真正的主语。Eg:Thathewillrefusethispieceofadviceisimpossible.（用it做形式主语改写句子）Itisimpossiblethathewillrefusethispieceofadvice.头重脚轻形式主语句末①It+be+__________+that从句(obvious, true, natural, surprising, wonderful, poss
6、ible, likely, certain, probable)Eg:显然他撒谎了。________________________________________特别注意：Itisimportant/natural/necessary/impossible/unbelievable/incredible/strangethat...句型中,主语从句应使用________语气,即用“(_______)+动词原形”的形式。Eg:我们学好英语是必要的.____________________________________________(2)it作形式主语常见的结构形容词I
7、twasobviousthathetoldalie.虚拟shouldItwasnecessarythatwe(should)learnEnglishwell.②It+be+___________+that从句(no wonder, an honor, a good thing, a pity, no surprise, etc.).Eg:他很懒.。难怪他这次考试不及格。_________________________________________________名词或名词词组Heisverylazy.Itwasnowond
