SectionIM“Grammar-未再从史语法精析难点突破区断知导引1,(教材PosjWhatitwastobecomeWasuncertainUntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.2.(教材PojTheearthbecamesoviolent乙at训WasnotclearwhethertheshapeWouldlastornot3,(教村J5j)IWhaisevsnInoreiniportantishatastheearthcooleddown,WaterbegantoappearOnlitsSurface.4.(教材PogjItwasnotimmediatelyobyiousthatwaterwWastobefundamentaltothedevelopmentoflife.5.(教村PogJWhatmanyscientistsbelieveisthatthecontinuedPresenceofwaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandSeas:6.(教材PogSowhetherlifewillcontinueontheearthformillionsofyearstocomeWilldependonwhetherthisproblemcanbesolved语法详饷一、定义在主从复合句中,充当主语的从句叫主语从句。HowtheearthcameintoexistenceTemainsamysterytos.地球是如何形成的对我们来说仍然是一个谜。Thatsmokingisharmfultoourhealthisafact吸烟有害佳素是守实*ItworriedtheWomanthathersonWasawaysplayingcomputer8ames.儿子一直在玩电脑游戏,这让这个女人很担心。BX(灿二、引导主语从句的连接词引导主语从句的连接词有三类:从属连词、连接代词和连接副词。1.连接词that和whetherif(UDthat在从句中不充当句子成分,也无意义,只起连接作用,但不可省略。Thatshebecameafmousnhysicistmadeherparentsveryhappy她成为了一名知名物理学家,这令她父母非常高兴。Thatsmokingisharmfultohealthisknowntoeveryone.吸烟有害健康,这是大家都知道的。(C)whether在从句中不充当句子成分,意为“是否“,起连接作用,不可省略。Whetherwegotherebytrainorbyairmakesnodifference.我们乘小车还是乘飞机去那儿没有什么差别。Whetherlifeexistsonotherplanetsisniotclear其他星球上是否存在生命还不清楚。2,连接代词引导的主语从句许接代词引导主语从句,在从句中可以作主语、宾语、表语或定语.常见的连接代词有:who,whose,whom,what,which,whoever,whomeverwhateverwWhichever等。Whowillbringupthechildhasntbeendecidedyet谁来抚养这个孩手还没有决定。WhichHfestyleisthbemostbeneficialtoourhealthisstillUnknow证不知道哪种生活方式对我们的健康最有利。WhoeversolyesthepuzzlecanTeceivetheaWard.无论谁解开那个谜团都可以得到奖赏。1Whateveryoudoshoulddonoharmtoothers:无论你做什么都不应该伤害别人。E3,连接副词引导的主语从句许接副词引导主语从句并在从句中作状语,表示时间、地点、方式、原因等。连接副词有:when,where,why,how等。Whenwewillsetoffhasnitbeendecided我们何时出发证没有决定。Howheearnedhislivingathistwentiesisnotcleartoanyone.任何人都不清煤他二十多岁时是如何谋生的。WhereWsshalldothetestisStllunderdiscussion,我们在什么地方做这个实验迦在讨论。三、主语从句与形式主语it有时为了考虑句子平衡,通常在主语从句中使用形式主语it,而将真正的主语从句移至句未.常见的用形式主语it引导的主语从句结构有:1.ILHHbe十形容词(clearobvious,true,naturalsurprising,goodWonderful,fhnny,possible,tikely,probable,certain,Uncertain,fortunateetcJ)一that从句。Itisclearthatthesintoldalis很明显,那个女孩说了谎。2.Itbe十名词(词组)(apity,nowonder,anhonouragoodidea|afactgoodnews,ashame,etc.)十that从句。)Itisapitythatyourparentsdidntpermityoutogowithus,你父母不允许你和我们一起去,这很遗憾。s硕NVL八人N