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1、SectionIVGrammar&Writing条分缕析语法精要细盘点语法精讲扫课一徼扫彩上精回严笙夷回码看主语从句语境领悟阅读下列句子，体会黑体部分用法1•Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.2.Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearonitssurface.3.Itwasnotim
2、mediatelyobviousthatwaterwastobefundamentaltothedevelopmentoflife.4-Whatmanyscientistsbelieveisthatthecontinuedpresenceofwaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.5.Whytheysuddenlydisappearedstillremainsamystery.6-Sowhetherlifewillcontinueonthe
3、earthformillionsofyearstocomewilldependonwhetherthisproblemcanbesolved.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在从句屮不充当任何成分，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。(2)whether/if在从句中不充当
4、任何成分，只起连接作用，意为“是否”，不可省略。Whethertheplanwillbecarriedoutisstillunknown.=Itisstillunknownif/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.连接彳弋词(who,whose,whom,what,which,whichever,whoever,whomever,whatever等)引导从句，在
5、从句屮可以作主语、宾语、表语或定语Whowillgototheconcertisnotknown.不知道谁会去听音乐会。Whoeverbreaksthelawshouldbepunished・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中作状语Whe
6、nwewillhaveameetingisanimportantquestion.我们何时举行会议是个重要的问题。WheretheEnglisheveningwillbeheldhasnotyetbeendecided.英语晚会将在哪里举行述没有决定。［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；(1)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,st
7、range,etc.)+主语从句It'sobviousthattheybadlyneedhelp.很明显，他们急需帮助。2.It+be+名词词组(nowonder,anhonour,apity,a/nosurprise,etc.)+主语从句It*sapitythatyoumissedthefilm.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。2.
8、It+不及物动词(happen,seem,appear,etc.)+主语从句Itseemsthatitisgoingtorain.看起来好像要下雨。3.It+及物动词+宾语+主语
