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1、GrammarSubjectUnit1SubjectThesubjectofasentenceistheperson,place,thing,orideathatisdoingorbeingsomething.1.WhatisSubject?Youcanfindthesubjectofasentenceifyoucanfindtheverb.Askthequestion,“Whoorwhat‘verbs’or‘verbed’?”andtheanswertothatquestionisthesubject
2、.Noun,adjective,nonfiniteverb,it,nominativepersonalpronounandthesubjectclauseandsoon.2.WhatcanbeusedasSubject?Atreehasfallenacrossthestreet.Theambulanceisarriving.名词、代词、数词、不定式、动词的ing形式、从句等可作句子的主语。1.名词作主语Youareamiddleschoolstudent.Helentmehisnewbike.Three
3、isenough.Twofromfiveleavethree.2.代词作主语3.数词作主语Tofindthetruthisverydifficult.It’sisverydifficulttofindthetruth.Smokingisbadforyourhealth.Seeingisbelieving.4.不定式作主语5.动名词作主语A动名词与不定式都可在句子中作主语。动名词作主语时一般来说指的是一个概念或一个既成事实。如：注意TeachingEnglishismyjob.TeachingEnglis
4、h是一个概念名词，而不是一个动作。B当一个不定式短语作主语时，我们常用It作形式主语，而把真正的主语——动词不定式放到句子后边。这样的句型还用在It’s…forsb.todo…It’s…ofsb.todo…中。如果It’s后边的形容词与人的天资、秉性有关时，必须用It’s…ofsb.todo…；这类形容词包括good,bad,clever,stupid,wise,foolish,cruel,mean等。如果It’s后边的形容词与人的天资、秉性无关时，则要用It’s…forsb.todo…。Therich
5、shouldhelpthepoor.Oldandyoungwalkedsidebyside.Thedisabledarebeingcarefullytakencareof.6.名词化的形容词作主语7.名词化的过去分词作主语Wheneveryoucomewillbefine.8.从句作主语作主语的从句称为主语从句，可由that，whether，wh-词等引导。BetweensixandseveninthemorningisthetimeIgojogging．Nearbyisagoodplaceforcam
6、ping．9.有时介词短语、副词或其短语位于主语位置是倒装结构(1)Itis+形容词(possible,clear,true,necessary,likely,nice等)+that(2)Itis+名词（apity,nouse,afact,nowonder等）+that用it作形式主语的句型有：(3)It+不及物动词（follows,happens,turnsout,goeswithoutsaying）+that(4)Itis+过去分词（thought,known,mentioned,said,expe
7、cted,suggested,maybesafelysaid,mustbeadmitted,hasbeendecided）+that在以上句型中It是形式主语,真正的主语是that引导的从句。在这样的主语从句中that不能省略,就其本质讲，用That…iswell-known;That…issaid也是可以的。但是经过长期使用,上述句型已经被固定下来。Whathehadalreadyforgottenaboutcomputerrepaircouldfillwholevolumes.3.Asimplesu
8、bjectcanbemorethanoneword,evenanentireclause.4.InEnglish,thesubjectofacommand,order,orsuggestion-you,thepersonbeingdirectedisusuallyleftoutofthesentenceandissaidtobetheunderstoodsubject.e.g.1.Yousteplivelythere,orI’llleave
