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专题二主语从句执笔人李雨欣
一、主语从句的定义和功能用作主语的从句称为主语从句即一个句子作主语；由定义可知，主语从句在主从复合句中作主语1What struckme wasthat theyhave allsuffered a lot.EG.12Whether theywould supportus wasa problem.3That youare ingto Londonis thebest newsI haveheard thislong time.4When we arrive doesnt matter.5Whatyousaidistrue.6Whomwe muststudyforisa questionofgreatimportance.找出取下旬子中的主语从句及其弓导词，并且指出弓导词是否充当成分，充当什么
2.I I成«•
1.Thatweshallbelateiscertain.
2.Thatthedrivercouldnotcontrolhiscarwasobvious.
3.Itiscertainthatweshallbelate.
4.Itwasobviousthatthedrivercouldnotcontrolhiscar.
5.Is itpossible that they will e tomorrow
6.It isclear thathe wast ellingthe truth.
7.Itsprobable thatwell bea littlelate.
8.What causedthe accidentis aplete mystery.
9.Itworried her a bitthat herhair was turning grey.
10.It shocked me that Peterdidnt tellanybodywhere hewas.
二、考前须知
①引导主语从句放在句首时不行省，但在句末口语中可省如that hatThathewasill yesterdayis knownnow.
②引导主语从句时，只能用作形式主语，放在句首，而将引导的主语从句放到if itif句末如It isuncertain ifhewillleave forBeijing tomorrow.
④连接代词引导主语从句只能放在句首如；
1.Who has broken the glass is unknown.
2.What hewants isall here.
⑤主语从句中主句的谓语动词一般用第三人称单数形式，但引导主语从句的主what句谓语动词的形式须依据句子的意思来推断如
1.How heworked itout isstill asecret.
2.What theymakes inthis factoryare TVsets.
三、主语从句练习锦集完形填空1makes mistakesmust correctthem.2It worriedherabither hairwasturninggrey.3It*s uncertaintheexperiment isworth doing.4we cantget seemsbetter thanwehave.5you dontlike himis noneof mybusiness.6well gocamping tomorrowdepends onthe weather.7you eor notis upto you.8makes mistakemust correctthem.9wearrivedoesnt matter.10surprise methattheyhave sufferedalot.11we willgo foranoutingtomorrow remainsunknown.12she boughtso manydictionaries isnot clear.13Its apityyou cant attendmy birthdayparty.14Itispossiblehe hasstolen thecar.15hasbrokentheglassisunknown.。
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