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1、SectionIVGrammar&Writing语法精讲条分缕析诒法精要细盘点主语从句阅读下列句子，体会黑体部分用法码上扫一扫看精彩徽课语境领悟1•Whatitwastobecomewasuncertainuntilbetween4.5and3.8晋billionyearsagowhenthedustsettledintoasolidglobe."彩微课2.Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearonitssurface.3.Itwasnotimmediatelyobviou
2、sthatwaterwastobefundamentaltothedevelopmentoflife.4.Whatmanyscientistsbelieveisthatthecontinuedpresenceofwaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.5.Whytheysuddenlydisappearedstillremainsamystery.6.Sowhetherlifewillcontinueontheearthformillionsofyearstocomew
3、illdependonwhetherthisproblemcanbesolved.要点精析一、主语从句的连接词及其句法功能1・连接词that和whether/if(l)that在从句中不充当任何成分，本身无任何意义，只起连接作用，但不可省略。ThatformerHollywoodchildstarShirleyTemplediedupsetherfansallovertheworld.好莱坞前童星秀兰•邓波儿的离世令她全世界的粉丝感到难过。⑵whether/if在从句中不充当任何成分，只起连接作用，意为“是否”,不可省略。Whethertheplanwillbecarr
4、iedoutisstillunknown.=ltisstillunknowni^whethertheplanwillbecarriedout.这个计划是否会实施还不知道。［名师点津］whether引导的主语从句既可放在句首也可放在句尾，但if引导的主语从句只能放在句尾，前面需用it作形式主语。2.连接代i司(who,whose,whom,what,which,whichever,whoever,whomever,whatever等)引导从句，在从句中可以作主语、宾语、表语或定语Whowillgototheconcertisnotknown.不知道谁会去听音乐会。Whoe
5、verbreaksthelawshouldbepunished.无论是谁只要违法就应该受到惩罚。Whateveryoudoinyoursparetimeshoulddonoharmtoothers.无论你在业余时间做什么都不应该伤害其他人。［名师点津］who引导的主语从句表示一件"事情”，而whoever引导的主语从句指“人”O3.连接副词(when,where,how,why等)引导主语从句并在从句屮作状语Whenwewillhaveameetingisanimportantquestion.我们何时举行会议是个重要的问题。WheretheEnglishevening
6、willbeheldhasnotyetbeendecided.英语晚会将在哪里举行还没有决定。［名师点津］名词性从句引导词的确定步骤：(1)分析句式结构，明确名词性从句在句中的功能；(2)明确名词性从句所表达的意义；(3)明确名词性从句中所需要的成分及意义；(4)确定从句的引导词。二、主语从句中用it作形式主语的结构1・It+be+形容词(obvious,true,natural,strange,etc.)4-主语从句It'sobviousthattheybadlyneedhelp.很明显，他们急需帮助。2.It+be+名词词组(nowonder,anhonour,ap
7、ity,a/nosurprise,etc.)+主语从句Itfsapitythatyoumissedthefilm.你没有看那部电影很遗憾。3.It+be+过去分i司(said,reported,thought,expected,proved,etc.)+主语从句Itissuggestedthatthemeetingbeputoff.有人建议会议延期召开。4・It+不及物动词(happen,seem,appear,etc.)+主语从句Itseemsthatitisgoingtorain.看起来好像要下雨。5.It+及物动词+宾语+主语从句I
