主语从句超全讲解加练习Word文档格式.doc

主语从句超全讲解加练习Word文档格式.doc

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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.

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

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.

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.

Whetherthemeetingwillbeputoff

规律三、whether可以引导主语从句，放在句首，但if不能

例4.Thatwhetherhewillhelpothers

isafact.

Thathewillhelpothersisafact.

规律四、主语从句中的连词不能重叠使用。

例5.Whenhewillcomeareapuzzle.

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.________