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1、不定式是动词的一种非限定形式,由“to+动词原形”构成,没有人称和数的变化,在句中不能独立作谓语.但不定式具有名词、形容词和副词的特征，在句中可以作主语、宾语、宾语补足语、表语、定语、状语等。复习不定式（RevisetheInfinitive）1.Itisgoodtohelpothers.2.Itismyambitiontomakesurethatthedisabledpeopleinourneighborhoodhaveaccesstoallpublicbuildings.3.Myambitionistoworkinthec
2、omputerindustrywhenIgrowup.辨别下面不定式在句子中充当的成分:(subject)(subject)(predicative)4.Idon’thavetimetositaroundfeelingsorryformyself.5.Iamtheonlystudentinmyclasstohaveapetsnake.6.Abigcompanyhasdecidedtobuyitfromme.7.MyfellowstudentshavebeguntoacceptmeforwhoIam.(attribute)(at
3、tribute)(object)(object)8.Ihavehadtoworkhardtoliveanormallife.9.SomedaysIamtootiredtogetoutofbed.10.Wemustcallonlocalgovernmenttogivefinancialassistancetodisabledpeople.(adverbial)(adverbial)(objectcomplement)不定式在句中的功能做主语:那样做是很幼稚的.Toactlikethatischildish.为避免句子出现“头重脚
4、轻”现象,常用it做形式主语,将真正主语的不定式后置.要学好英语不是那么容易的。Ex.ItisnoteasytolearnEnglishwell.(2)做宾语她喜欢谈论这件事情。Ex.Shelovestotalkaboutthematter.他希望不久能找到工作.Hehopestofindajobsoon.常接不定式做宾语的动词有：afford,agree,aim,arrange,ask,attempt,begin,bother,care,choose,continue,dare,decide,demand,expect,fa
5、il,hate,hope,learn,long,manage,mean,need,offer,plan,prefer,prepare,promise,prove,refuse,want,wish等<1>.不定式有时和连接代/副词一起构成宾语.Ex.Doyourememberwhichwaytogetthere?下一步干什么你决定了吗?Haveyoudecidedwhattodonext?我来问他怎么样开这机器.I’llaskhimhowtooperatethemachine.<2>有时不定式由whether引起.Ididn’t
6、knowwhethertolaughorcryaboutit.<3>feel,find,judge,make,think,believe,consider等动词后如果是不定式做宾语,补语是形容词(间或是名词),常用it作形式宾语,把不定式后移.Ex.Ifinditdifficulttoworkwithhim.3.做宾语补足语:常带to的不定式做宾语补足语的动词有:ask,beg,prefer,help,promise,wish,want,expect,permit,request,allow,command,tell,invi
7、te,cause,encourage,warn,advise,persuade,force,order,remind,teach,等.Ex.Fatherwillnotallowustoplayonthestreet.Mybrotheraskedmetocleantheroomwithhim.后接不带to的不定式做宾语补足语的动词有:let,hear,have,make,see,observe,feel,watch,notice等.Ex.Thepolicemansawachildplayinthestreet.Achildwas
8、seentoplayinthestreetbythepoliceman.4.做表语不定式可用作表语,说明主语的具体内容.Myworkistocleantheroomeveryday.我的梦想是成为一名医生.Hisdreamistobeadoctor.5.做定语不定式放在被修饰
