语从句(SubjectClause)定义:如果一个句子在复合句中充当一个主语,那么这个句子就是主语从句.第一部分:常规主语从句,即句子在复合句中充当一个主语(1)Thathefinishedwritingthecompositioninsuchashorttimesurprisedusall.(2)Whetherwewillgoforanoutingtomorrowremainsunknown.(3)Whowillbeourmonitorhas'tbeendecidedyet.(4)Whomwemuststudyforisaquestionofgreatimportance.(5)Whatcausedtheaccidentremainsunknown.(6)Whateveryoudidisright.(7)Whosewatchwaslostisunknown.(8)Whatweneedistime.(9)Whatweneedaregooddoctors.小结:(1)引导主语从句连词有that,whether,who,what,whatever等(2)连词位于句首不能省略(3)主语从句大多数情况下视为单三,但也有例外,如例9第二部分:为了防止句子头重脚轻,通常把形式主语it放在主语位置,真正主语搁置于句末(1)Itiscertainthathewillwinthematch.(2)Itistruethathehasmadeaveryimportantdiscoveryinchemistry.(3)Itisverylikelythattheywillholdameeting.(4)Itisstrangethatheshoulddothat.(5)Itisimportantthatweallshouldattendthemeeting.(6)Itisstrangethatthemanshouldhavestucktohissillyideas.(7)Itisapitythatwewon'tbeabletogotothesouthtospendoursummervacation.(8)Itisstillamysterywhatcausedtheaccident.(9)Itissaidthathehasgonetoshanghai.(=Heissaidtohavegonetoshanghai)(10)ItisknowntoallthatthegunpowderwasfirstinventedbytheChinese.(11)Itissuggestedthattheworkshouldbedonewithgreatcare.(12)Itseemsthathehasseenthefilm.(=Heseemstohaveseenthefilm)(13)Ithappenedthatthetwocheatswerethere.(=Thetwocheatshappenedtobethere)小结:(1)以that引出的主语从句,常以形式主语it引导.Itis+形容词/名词/某些动词ed+that从句.(2)在有些that从句中要用虚拟语气(should+do/should+havedone)例句4,5,6,11.
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