名词性从句主语从句.docx

《名词性从句主语从句.docx》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、主语从句导入：观察并指出句子成分Atreehasfallenacrosstheroad.Youareastudent.Tofindyourwaycanbeaproblem.Smokingisbadforyou.一．概念：主语：主语是指句子谈论的主题，说明的人或事物。也就是句中动作、行为、性质和状态的主体，一般位于句首主语从句：在句中充当主语的从句二·基本结构关系词简单句谓语动词宾语同位语Thathefinishedwritingthecompositioninsuchashorttimesurprisedusall.他在很短的时间内写完作文让我们都很惊讶三关系词(引导词)1．从属连词

2、：thatwhetherthat引导主语从句只起引导作用，本身无实际意义，在主语从句中不充当任何成分，但不能省略。Thatshelefthimcuthimtotheheart.Thathewillcomeiscertain.注意：有时为了使句子结构平衡,避免“头重脚轻”,常用it作形式主语,而把从句放在后面。E.gThatshehasmadesuchamistakeisapity.Itisapitythatshehasmadesuchamistake.这样就构成了下面一些常用句型:1)Itis+adj.+从句　Itisnecessarythat…有必要…Itisimportantth

3、at….重要的是…Itisobviousthat……很明显……2)It+不及物动词+从句　Itseems/appearsthat...似乎……Ithappenedthat...碰巧……Itoccurredtomethat……我突然想起……3)It+be+过去分词+从句　　Itissaidthat...据说……　　Itisknowntoallthat...众所周知……　　Itisreportedthat...据报道……　　Itisbelievedthat...据信……;人们相信……　　Itissuggestedthat...有人建议……Itmustbepointedoutthat...

4、必须指出……Ithasbeenprovedthat...已证明…….4)Itis+n.+从句Itiscommonknowledgethat……是常识Itisasurprisethat….令人惊奇的是…Itisafactthat……事实是……由whether及其他连词引导的主语从句放在句首，句后都可。Whetheritwillpleasethemishardtosay.Itishardtosaywhetheritwillpleasethem.2.连接代词：whowhoeverwhomwhosewhatwhateverwhichwhicheverWhatseemseasytosomepe

5、opleseemsdifficulttoothers.Whichsidewillwinisnotclear.注意：what与that在引导主语从句时的区别what引导主语从句时在从句中充当句子成分,如主语、宾语、表语,that则不充当任何成分无意义。例如：Whatyousaidyesterdayisright.Thatsheisstillaliveisaconsolation3.连接副词：whenwherehowwhy等Whyhediditremainsamystery.Whentheywillstartisnotknownyet.Howhebecameagreatscientist

6、isknowntousall.It’scertain.We’llbelate.Ishecomingornot?Wedon’tknowWhatdoeshewanttotellus?Wedon’tknowWhenwillyoucomeback?Itdoesn’tmatter.四．主语从句需注意的问题1一个句子作主语时，主句的谓语动词应为单数。EgWhetherhewillcomedependsontheweather.2what引导的句子作主语时，谓语动词的数由句子的内容决定（即由表语决定)。WhatIwantismoney.WhatweneedaregoodbooksWhathesai

7、disreasonable.Whatwewilldohasn’tbeendecided.3Wherehewasbornandwherehelivesnowarenotclear.Whereandwhenhewasbornremainsasecret.两个或两个以上的主从联合做主语，主句谓语动词应为复数。两个或两个以上的连词引导一个从句，主句谓语动词应为单数。4Whetherhewillcomeisn’tclear.(不能换成if)Itisn'tclearw