名词性从句分为主语从句

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1、n定义n名词性从句分为主语从句、宾语从句、表语从句、同位语从句。所谓名词性从句是用从句替代名词或代词在句中作主语、宾语、表语或同位语。nn1.What与that在名词性从句中的区别:nwhat在名词性从句中是代词,而that在名词性从句中是连词;what起主语、宾语、表语的作用，而that却不可以。(that在定语从句中可起主语、宾语、表语作用。)Whathesaidwastrue.Allthathesaidwastrue.ThatEdisoninventedthebulbisofgreatvaluetousall.WhatEdisoninventedledu

2、stobrightness.n2.Whether/ifnWhether引导的名词性从句可作主语、宾语、表语或同位语；而if只在某些宾语从句中可与whether互换。在宾语从句中如遇下列情况只能用whether，而不用if：n①在discuss,decide等动词后n②在介词后n③在不定式前nWediscusswhetherweshouldclosetheshop.nWehaven’tsettledthequestionofwhetherIshouldgotoOxford.nShedoesn’tknowwhethertogetmarriedtoFrankorno

3、t.n3.S.+doubt+whether…S.+doesn’tdoubt+that.…n说明：doubt=benotsure/certain(of)nnotdoubt=besure/certainofnIdoubtwhetherit’llclearup.nIdon’tdoubtthathewillsucceed.nIdoubtwhetherit’llclearup.nIdon’tdoubtthathewillsucceed.n4.在wonder肯定式后加wh-words引导的从句，而在nowonder后接that从句，其理由与doubt相同。nIwonder

4、whenweshallgetthere.nThere’snowonderthathehassomethingtodonwiththerobbery.n5.在asif,asthough引导的表语从句中，在必要的情况下应用虚拟语气。Should常可以省略。nHelooksasifheweretired.nShespeaksEnglishverywellasifshecamefromEngland.(wereanativeofEngland.)nIrememberthewholethingasifithappenedyesterday.nWefeltasthough

5、wehadwitnessedthewholething.nFromtimetotimeTimturnedroundasif(hewere)searchingforsomeone.nThefellowstarted,asif(hewere)awakenedfromsomedream.nn6.order,demand,require,request,advise,beanxiousthat…+(should)do…nPleaseadvisemewhetherI(should)accepttheoffer.nIorderthathe(should)goatonce.

6、nTheyareespeciallyanxiousthatyoushouldcome.nHerequiresthattheyshouldworkallnight.nItisrequestedthatavote(should)betaken.n7.在order,suggestion等名词后的同位语/表语从句中用虚拟语气,(should)常可以被省略。nPresentlyhemadethesuggestionthattheycarryontheconversationinFrench.nHissuggestionwasthattheycarryontheconve

7、rsationinFrench.nTheofficergaveanorderthathismenshouldreachthetopofthehillatdawnn8.在suggest,insist,ask后会出现两种语气。nHesuggestedthatI(should)turntomyboss.nTheexpressiononhisfacesuggestedthathewasangry.nTheoldmaninsistedthathewasstillyoungandcouldcontinueworking.nThepoliceinsistedthatwesh

8、ouldofferproof.nIas