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1、UnitOneMakingadifferencePeriodfourGrammar动词不定式是一种非限定性动词,由to＋动词原形构成,但在有些情况下to可以省略。动词不定式在句中可以作主语、宾语、表语、定语和状语。Grammar--不定式Grammar--不定式的用法Tofinishsomuchhomeworkinadayisimpossible.Toseeistobelieve.Mywishistobeadoctor.Iwanttodoitmyself.Grammar--不定式的用法Wefounditdifficultto
2、workwithhim.Healwayshasalotofmeetingstoattend.Heislookingforaroomtolivein.Istudyhardtoservethepeoplewell.Inordernottobelateshetookabus.Grammar--不定式作主语常见带形式主语it的句型：1.Itiseasy(difficult,important,possible,necessary,good,kind,wise,foolish…)todosth.2.Itisapleasure(pity
3、,crime,anhonor…)todosth.3.Ittakes(sb.)sometimetodosth.Itisdifficulttounderstandhim.Itisapleasuretohelpyou.It'sagreathonortobeinvitedtoMary'sbirthdayparty.Ittakesmeanhourtocleantheroom.Grammar--不定式作主语Grammar--不定式作表语不定式作表语时一般紧跟在系动词be,seem,remain,appear,get等后面，用来说明主语的
4、内容。常见的主语有：one’sdream,business,wish,idea,plan,job,work,task,duty,whatonewantstodo…Mywishistobeadoctor.Mychiefpurposeistopointoutthedifficultiesofthematter.Grammar--不定式作宾语1.常见的不定式作宾语的及物动词有：want,hope,wish,agree,promise,decide,determine,fail,manage,offer,prepare,preten
5、d,choose,expect,refuseIliketokeepeverythingtidy.WhenIheardthewords,Ididn’tknowwhethertolaughortocry.IwanttospeaktoTom.Grammar--不定式作宾语2.feel,find,judge,make,think,believe,consider+it+adj./n.+todosth.Hethoughtitagreatpitynottohaveinvitedher.Shemadeitaruletogetupatfiv
6、e.Grammar--不定式作宾语补足语Theteachertoldusnottobesonoisyintheclass.Iexpectyoutogivemesomehelpintheexperiment.Fatherwillnotallowustoplayonthestreet.Webelievehimtobeguilty.Grammar--不定式作宾语补足语一些动词后作宾补的不定式不带to.一感：feel+sb+dosth.二听:hear,listento三看:see,watch,lookat,observe,notic
7、e四使役:let,make,haveSuddenlywefelttheatmospheregrowtense.Whatmadehimdothatagainandagain?Grammar--不定式作定语Ineedapentowritewith.Inthedarkroom,heevenhadnobedtosleepon.Ineedsomeonetotypethelettersforme.Thebuildingtobebuiltisalab.Grammar--不定式作定语所修饰的名词前有thefirst/last/next,th
8、eonly,thebest,themost等序数词或最高级等修饰语时,用不定式作定语.不定式修饰something,anything,nothing.ThenexttraintoarriveisfromWashington.Iwantsomethingtoread.It’syourturn
