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1、Grammar主语从句就是在复合句中做句子主语的从句。1.Thattheearthtravelsroundthesunisawell-knownfact.2.Itisuncertainwhethertheartistcandoitornot.3.Whowillacttheleadintheplayhasnotbeendecidedyet.主语从句【归纳总结】引导主语从句的词有连词that,whether；连接代词who,whose,what,which,whom,whoever,whatever等
2、；连接副词where,when,whenever,wherever,how,why等。主语从句的that放在句首通常不能省略。2.有时用it作形式主语，将主语从句后置。在主语从句中常用it做形式主语，而把真正的主语从句后置，常用的句型有：1)Itis+n.+从句Itisafact/anhonour/apitythat---2)Itis+adj.+从句Itisnatural/important/possible/certainthat---3)It+vi.+that---Itseems/appear
3、s/happened/turnedoutthat---4)Itis+过去分词+that---Itisreported/said/believed/announced/suggested/wellknownthat---1Whetherhewilldoitremainsaquestion.2Whatwehaveseenisquitedifferentfromwhatwehavelearned.3It’sapitythathedidn’tcometothepartyyesterday.4Itisnec
4、essarythatweshouldlearnEnglish.5Ithappenedthathewasoutthatday.6Itisreportedthathelosthislifeinthewar.【常见错误展示】下列各句均有一处错误，请改正并分析错误的原因。1.Lighttravelsfasterthansoundiscommonknowledge.2.Ifshe’scomingornotdoesn’tmattermuch.Thatthat虽无词义但引导主语从句位于句首时不能省略。Wheth
5、erif,whether都可表示“是否”,但if不能引导位于主句之前的主语从句，它可以引导位于主句之后带有形式主语it的主语从句。3.Thattheprofessorsaidisofgreatimportance.4.Wherewillthetreesbeplantedhasnotbeendecided.Whatthat引导主语从句时无词义。Whattheprofessorsaid表示“教授所说的”。将will置于trees之后。主语从句要用陈述句语序。5.Nomatterwhobreaksthe
6、rulewillbepunished.6.Whenandwherethemeetingwillbeheldstillremainaquestion.引导让步状语从句时二者可互换，但引导名词性从句时只能用whoever。Whoever主语从句表示单一概念时，谓语要用单数形式。remains7.Itwasrequestedthateveryonemadeaspeechatthemeeting.在“Itisrequested/ordered/suggested+that从句”中，从句要用虚拟语气，即谓语
7、用“should+动词原形”，should可省略。(should)make同位语从句1.同位语从句一般跟在某些名词如idea,fact,news,hope,belief,suggestion,proposal,word,thought,doubt,truth,possibility,promise等的后面，用以说明或解释该名词的具体内容。如:Thenewsthathisheathisfailingmadeussad.Ihavenoideawheretheyarespendingtheirholid
8、ays.2.同位语从句有时可以不紧跟在它所说明的名词后面，而是被别的词隔开，以使整个句子结构显得平衡。如：HegotthenewsfromMarythatthemeetingwasputoff.3.同位语从句通常由that引导，但that不在从句中充当成分，也不能省略；同位语从句也可以由whether,when,where,how等引导。如：Theyraisedthequestionwhereweshouldgo.Ihavenoideawhatheisdoingnow.Wordca
