动词不定式动词不定式的作用FunctionsofInfinitive三.用法/功能Iwanttogohome.Ifounditnecessarytotalktohimagain.Theteachertoldmetocleantheblackboard.Iexpectyoutogivemesomehelp.e.g.Imadehimdohiswork.1.Theysawtheboyfallsuddenlyfromthetree.Theboywasseentofallsuddenlyfromthetree.3>不定式用在介词but,except,besides后时,如果这些介词前有行为动词do的各种形式(do/did/does),那么介词后的不定式不带to,相反则带to.Ihavesomethingtosay.Hehasalotofhomeworktodo.注意：如果不定式中的动词是不及物动词,则不定式中要有介词.Heislookingforaroomtolivein.Thereisnothingtoworryabout.1.不定式做定语时常放在被修饰的名词或代词之后(1)Shewasverybusyandhadnotimetovisitherfriends.(2)Ladiesandgentlemen,Ihavesomethingimportanttotellyou.2.当名词被thefirst,thelast,theonly等词以及形容词最高级修饰时eg:Sheisalwaysthefirsttocomeandthelasttoleave.4.如果不定式是不及物动词,则后面需适当的介词Pleasepassmesomepapertowrite____.Shehasanicepentowrite_____.Heboughtaflatforthefamilytolive____.3.结果状语:Icameheretoseeyou.Hegotupearlytocatchthetrain.(7).独立结构(8)不定式与疑问词who,which,when,how,what等连用，在句中起名词作用，可充当主语、表语、宾语等。固定词组和句型1.Itisgoodtohelpothers.2.Itismyambitiontomakesurethatthedisabledpeopleinourneighborhoodhaveaccesstoallpublicbuildings.3.MyambitionistoworkinthecomputerindustrywhenIgrowup.4.Idon’thavetimetositaroundfeelingsorryformyself.5.Heisalwaysthefirsttocomeandthelasttoleave.6.Abigcompanyhasdecidedtobuyitfromme.7.MyfellowstudentshavebeguntoacceptmeforwhoIam.8.Ihavehadtoworkhardtoliveanormallife.9.SomedaysIamtootiredtogetoutofbed.10.Wemustcallonlocalgovernmenttogivefinancialassistancetodisabledpeople.exerciseMyteacherwasmade_____histeachingbecauseofpoorhealth.givingupB.togiveupC.giveupD.givenup2.Thesentencewants____oncemore.explainedB.toexplainC.beingexplainedD.explaining3.TheArcticisconsidered____thenorthernpartoftheAtlantic.havingbeenB.tohavebeenC.tobeD.being?4.TheEmperororderedthewonderfulcloth_____forhimwithoutdelay.tohavewovenB.tobewovenC.tobeweavingD.toweave?5.IfoundtheGermanlanguagehard____.learnedB.learningC.tobelearnedD.tolearn?6.—Thelightintheofficeisstillon.---Oh,Iforgot______.turningitoffB.turnitoff