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  ifyouarelate,youwillnotfindaseat是一个主语从句所以是主将从现?要是虚拟语气IfIwereyou,Iwouldhave.这不是主语从句么?我想知道怎么判断主将从现句。有人说是主语从句才能引导主将从现!

  ifyouarelate,youwillnotfindaseat是一个主语从句所以是主将从现?

  要是虚拟语气IfIwereyou,Iwouldhave.这不是主语从句么?

  我想知道怎么判断主将从现句。有人说是主语从句才能引导主将从现!

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2020-01-21 15:46
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  主语从句(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.

2020-01-21 15:47:23

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