专题十二名词性从句I、重点难点解析名词性从句是历年高考的重点和难点也是热点。名词性从句相当于名词，可分别作主句的主语、宾语、表语和同位语。因此，名词性从句可分为主语从句、表语从句、宾语从句和同位从句（见下表）。主语从句做主语，用that，whether，what（＝thethingthat）等连接词（原疑问词）引导宾语从句做宾语，用that（可省略），if，whether（ornot），what（＝thethingwhich）等连接词（原疑问词）引导表语从句用that，whether，what（＝thethingwhich）等连接词（原疑问词）引导同位语从句用that（常用在news，thought，idea等词后），whether等连接词（原疑问词）引导一、主语从句主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。如：Whowillgoisnotimportant.Itdoesn’tmattersomuchwhetheryouwillcomeornot.Thathesuddenlyfellilllastweekmadeussurprised.1.It作形式主语和it引导强调句的比较It作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。被强调部分指人时也可用who/whom。例如：Itisapitythatyoudidn’tgotoseethefilm.（主语从句）Itdoesn’tinterestmewhetheryousucceedornot.（主语从句）Itwasinthemorningthatthemurdertookplace.（强调句）ItisJohnthatbrokethewindow.（强调句）2.用it作形式主语的结构：句型例子1Itis＋名词＋从句Itisafactthat…事实是…/Itisanhonorthat…非常荣幸Itiscommonknowledgethat…是常识2Itis＋形容词＋从句Itisnaturalthat…很自然…/Itisstrangethat…奇怪的是…3Itis＋不及物动词＋从句Itseemsthat…似乎…/Ithappenedthat…碰巧…Itappearsthat…似乎…4It＋被动结构＋从句Itisreportedthat…据报道…/Ithasbeenprovedthat…已证实…Itissaidthat…据说…第1页共8页13.主语从句不可位于句首的五种情况：情况说明例句1if引导的主语从句不可居于复合句句首。Ifhewillcomeornotisunknown（误）.Whetherhewillcomeornotisunknown（正）2Itissaid/reported…结构中的主语从句不可提前ItissaidthatJiangwillvisitourschool.（正）Jiangwillvisitourschoolnextweekissaid.（误）3Ithappens/occurs…结构中的主语从句不可提前Itoccurredtohimthathefailedintheexamination.（正）Thathefailedintheexaminationoccurredtohim.（误）4Itdoesn’tmatterhow/whether…结构中的主语从句不可提前Itdoesn’tmatterwhetherheiswrongornot.(正)Whetherheiswrongornotdoesn’tmatter.（误）5含主语从句的复合句是疑问句时,主语从句不可提前Isitlikelythatitwillrainintheevening?（正）Isthatwillrainintheeveninglikely?（误）二．宾语从句宾语从句就是在复合句中作宾语的名词性从句，通常放在主句谓语动词(及物动词)或介词之后。情况说明例句1作动词的宾语由that引导的宾语从句(that通常可以省略)Iheard(that)hejoinedthearmy.由what,whether(if),when,where等引导的宾语从句Shedidnotknowwhathadhappened.Iwonderwhetheryoucanchangethisnoteforme.动词＋间接宾语＋宾语从句Shetoldmethatshewouldacceptmyinvitation.2作介词的宾语Oursuccessdependsuponhowwellwecancooperatewithoneanother.3作形容词的宾语Iamafraid(that)I’vemadeamistake.4it可以作为形式宾语Wehearditthatshewouldgetmarriednextmonth.5否定的转移（若主句谓语动词为think,consider,suppose,believe,expect,fancy,guess,imagine等，其后的宾语从句若含有否定意义，一般要把否定词转移到主句谓语上，从句谓语用肯定式）Idon’tthinkthisdressfitsyouwell.我认为这件衣服不适合你穿。注意：that引导的从句常跟在下列形容词后作宾语：anxious,aware,certain,confident,convinced,determined,glad,proud,surprised,worried,sorry,thankful,ashamed,disappointed,annoyed,pleased,hurt,satisfied,content等。也可以将此类词后的that从句的看作原因状语从句。三．表语从句第2页共8页2...
