主语从句超全讲解加练习.doc
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主语从句超全讲解加练习.doc
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1)从属连词:
that,whether等.
that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。
Thathewillwiniscertain.他肯定会赢。
Whetherhe’llcomehereisn’tclear.他是否会来这里还不清楚。
注意:
由that引导的主语从句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。
例如:
1.Thathewillrefusethispieceofadviceisimpossible.
2.Thattheyshouldlikeeachotherisnatural.
这样就构成了下面一些常用句型:
1)Itis+n.+从句
Itisapity/shamethat...遗憾的是……
Itisasurprisethat…令人惊奇的是…
Itisafactthat……是事实
Itiscommonknowledgethat……是常识
______________(很遗憾)welostthematch.
_____________(这是事实)hecheatedintheexam.
2)Itis+adj.+从句
It’scertainthat…肯定…
Itispossiblethat...很可能……
Itisunlikelythat...不可能……
Itisobviousthat…很明显…
Itisnecessary\important\natural\...that…+(should)do
________________(很可能)shewillcomebacktomorrow.
*_________________(很明显)thismeasureiseffective.
3)It+不及物动词+从句
Ithappenedthat...碰巧……
Itoccurredtomethat…我突然想起…
_______________(刚好)Icameintotheofficeatthattime.
*____________________(我突然想起)Iforgettosenttheletter.
4)It+be+过去分词+从句
Itissaidthat...据说……
Itisknowntoallthat...众所周知……
Itisreportedthat...据报道……
Itisbelievedthat..人们相信/认为……
Itissuggestedthat+(should)do...建议……
__________________(据报道)20peoplewerekilledintheaccident.
*_______________(建议)weshouldeatmorevegetableanddomoreexercise.
2.连接代词who,what,which,whatever,whichever,whoever
(Who,whom,which,what可以和ever构成合成词,和what一样引导从句,ever起到强调作用。
它们在句子中担任主干成分,并用陈述句形式)
Whatmanyscientistsbelieveisthattheearthisround…
Whowilltakepartinthemeetinghasnotbeendecided.
Whoeverbreaksthelawwillbepunished.
Whateverwassaidheremustbekeptsecret.
3)连接副词when,where,how,why等。
Whytheysuddenlydisappearedstillremainsamystery.
Whentheywillleaveisnotdecided.
Howwewillpaintthehousehasnotbeendecided.
注意:
1)主语从句在句首时,必须由连接词引导,不能省略这些连接词
误:
Theyshouldlikeeachotherisnatural.
正:
Thattheyshouldlikeeachotherisnatural
2)whether引导主语从句,if不可
误:
IfMaryreallyheardhimisreallydoubtful.
正:
WhetherMaryreallyheardhimisreallydoubtful.
Completethesentencesusingwhat,whether,where,when,who,why,howorthat.
1.(_____isneededforsuccess)isyourhardwork.
2.2.(______theywillarrive)hasbeentoldtotheteacher.
3.(_____wewillgotomorrow)hasn’tbeendecidedyet.
4.(______canjoininthesportmeet)isdecidedbytheteacher.
5.(________itwillrainornot)isnotclear.
Conclusion:
主语从句作主语时,谓语动词一般用单数形式。
主语从句的规律:
找出下列句子中的错误,并总结规律例
1.Whenwillhecomeisnotknown.
.正:
Whenhewillcomeisnotknown.
规律一、主语从句一律用陈述语序,即主语在前,谓语在后。
例2.Hewillnotcometothemeetingthiseveningistrue.
正:
Thathewillnotcometothemeetingthiseveningistrue.
规律二、连词that在从句中无实际意义,但不能省略。
例3.Ifthemeetingwillbeputoff
hasnotbeendecidedyet.
正:
Whetherthemeetingwillbeputoff
hasnotbeendecidedyet.
规律三、whether可以引导主语从句,放在句首,但if不能
例4.Thatwhetherhewillhelpothers
isafact.
正:
Thathewillhelpothersisafact.
规律四、主语从句中的连词不能重叠使用。
例5.Whenhewillcomeareapuzzle.
正:
Whenhewillcomeisapuzzle.
规律五、含主语从句的主句谓语动词多用单数第三人称形式。
1.Whatheneedsisthatbook.
2.Whatheneedsaresomebooks.
规律六、what引导的主语从句,可根据表语决定主句动词的单复数形式。
规律七、主语从句为了避免头重脚轻现象,用it做形式主语,而把从句放在后面。
Thattheearthturnsaroundthesunisknowntoall.
Itisknowntoallthattheearthturnsaroundthesun.
找出错误,并给出理由:
1.Whereshallwespendtheholidayisn’tdecided.
2.Youhavemadeamistakeisafact.
3.Ifthepolicemanwillcomeisnotcertain.
4.Thatiscertainthatwecanwin.
5.Itisorderedweshouldleaveatonce.
6.Wherehecomesfromareamystery.
7.Whatwhetherhelikesthejobisnotclear.
8.Whoheisandwhereheisfromisimportant.
9.Whathesawisthestarsinthesky.
1.___hemadeanimportantspeechat
themeetingwastrue.
A.ThatB.WhyC.WhatD.How
2.___we’llgocampingtomorrowdependsontheweather.
AIfBWhether
CThatDWhere
3.Itworriedherabit___herhairwasturninggray.
whetherB.that
C.whatD.when
4.WhatIsayandthink___noneofyourbusiness.
A.isB.areC.hasDhave
请用恰当的主语从句连词填空:
What,it,that,whether,whoever
1._____youdon’tlikehimisnoneofmybusiness.
2._____hesaidatthemeetingastonishedeverybodypresent
3.________the2000OlympicGameswillbeheldinBeijingisnotknownyet.
4.________we’llgocampingtomorrowdependsontheweather.
5.________leavestheroomlastoughttoturnoffthelights.
用whether\if填空
1.Thequestionis________thefilmisinteresting.
2.________
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