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1、主语与同位语从句主语从句主语从句是在主句中起主语作用的从句。连接主语的连接词that,whether(从属连词）在从句中不作任何成分。Whetherwecangotopicnictomorrowisstillaquestion.明天我们能不能去野炊还是个问题。由连接词引导的主语从句：Thatthewoundedsoldierisstillaliveisawonder.ThatMr.Zhouwillcomeiscertain周先生要来，这是肯定的。是否这个工作能被准时完成还是个疑问。Whethertheworkcanbecompleted
2、ontimeisdoubtful.在我们学校，有些学生老是迟到，这是无法接受的。Thatinourschoolsomestudentsarealwayslateisunacceptable.连接代词引导的主语从句Who,whom,whosewhat,whatever,which,whichever连接代词在从句中充当主语，宾语或定语，不能省略。谁会去都没有什么区别。Whowillgomakesnodifference.不管是谁违反规则都要受到惩罚。Whoeverbreakstheruleshouldbepunished.她爱的是谁已经够
3、清楚了。Whomshelovesisclearenough.谁的钱包被偷了必须被搞清楚。Whosewalletwasstolenmustbemadeclear.连接副词when,where,how,why,whenever,wherever,however它们在句中充当状语，不能省略。此类主语从句也可以用带有形式主语it的句子转换。新运动场什么时候可以完工还是个问题。Whenthenewplaygroundcanbecompletedisstillaquestion.Itisstillaquestionwhenthenewplaygro
4、undcanbecompleted.注意：that引导的主语从句可用形式主语it替代，将it前置，做形式主语，that从句放后，但that不可省略。形式主语it代替主语从句：1)It+系动词+形容词+that从句necessary,right,likely,unlikely,wrong,important,certain,clear,obvious,strange等大部分学生想回家，这是肯定的。Itiscertainthatmostofstudentswanttogohome.很有可能明天会是个雨天。Itislikelythatitwi
5、llbearainydaytomorrow.注：it’snecessary/important/strange/natural+that的从句结构中，常用（should）+动词原形结构。It’snecessaryandimportantthatoneshouldmastertheskillsofoperatingcomputers.学生上课认真听讲是很重要的。Itisimportantthatthestudentsshouldlistencarefullyinclass.2)It+系动词+名词+that从句awonder,nowonde
6、r,apity,ashame,goodnews,afact,It’snowonderthatyouhaveachievedsomuchsuccess.真可惜你没出席昨天的讲座。It’sapitythatyoudidn’tattendthelectureyesterday.3)It+be+动词的ed+that从句said,told,heard,reported,decided,suggested等，据说她有很多钱。Itissaidthatshehadalotofmoney.4)It+特殊动词+that从句seem,appear,happe
7、n,matterItseemstomethatyouobjecttotheplan.IthappenedtomethatIhadbeenawaywhenyoucalled.if/whether引导的主语从句表示“是否”意义时whether引导的主语从句可以放于句首、句末，if引导的主语从句不能位于句首；但如果有形式主语it引导时，两者都可用。Whethertheworkcanbecompletedontimeisdoubtful.It’sdoubtfulwhether/iftheworkcanbecompletedontime.Wh–类
8、连接副词或连接代词引导的主语从句可放于句首，也可放句尾。Whenthenewroadisopentotraffichasnotbeenmadeclear.Ithasnotbeenmadeclearwhent
