高一英语必修三Unit4课文主语从句Microsoft PowerPoint 幻灯片.ppt

unit4Astronomy：thescienceofthestars,HowLifeBeganOnTheEarth,找出课文中的主语从句Whatitwastobecomewasuncertainuntilbetweeen4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.(L6-8)随后它会变成什么没人能知道，直到3845亿年前，这团尘埃才慢慢地形成一个固体的球状物。,Whatitwastobecome,whenthedustsettledintoasolidglobe,主语从句,定语从句,Itwasnotclearwhethertheshapewouldlastornot.(L9-10)句子可改为Whethertheshapewouldlastornotwasnotclear.翻译：不知道这个固体形状是否会继续存在下去。,whethertheshapewouldlastornot,主语从句,It是形式主语,Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearonitssurface.（L13-15）翻译：更为重要的是，地球冷却了下来，地球的表面就开始出现了水。,Whatisevenmoreimportant,主语从句,Itwasnotimmediatelyobviousthatwaterwastobefundamentaltothedevelopmentoflife.(L18-20)句子可改为：Thatwaterwastobefundamentaltothedevelopmentoflifewasnotimmediatelyobvious.水对生命的发展会起到关键作用，这一点在当时并不明显。,thatwaterwastobefundamentaltothedevelopmentoflife.,主语从句,It是形式主语,Whatmanyscientistsbelieveisthatthecontinuedpresenceofwaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.（L21-25）翻译：很多科学家相信，由于地球上长期有水存在，使地球得以把有害气体和酸性物质溶解在海洋里。,Whatmanyscientistsbelieve,主语从句,Whytheysuddenlydisappearedstillremainsamystery.(L41-42)它们为什么会突然灭绝至今仍是个谜。,Whytheysuddenlydisappeared,主语从句,Sowhetherlifewillcontinueontheearthformillionsofyearstocomewilldependonwhetherthisproblemcanbesolved.（L50-51）翻译：所以，在未来的数百万年中，生命能否在地球上延续取决于这个问题能否得