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1、动词不定式Self-introductionMynameisMarina.NowIamanEnglishteacher.Infact,frommychildhood,tobeadoctorwasalwaysmydream.WhenIwasaseniorthreestudent,mymotherfellillanddiedofhighbloodpressure.Sincethen,Ihavedecidedtotrymybesttohelpthepeopleinneed.Unfortunately,Ididn’tgethighmar
2、ksandbecameateacher.However,Ididn’tloseheart.Ioftenencouragetheteenagestostudyhard.Ofcourse,torealizetheirdreams,mystudentsshouldgraspthevaluablechancetogotocollege.Nowadays,mypresenttaskistohelpmorestudentsimprovetheirEnglish.（1）不定式由“to+动词原形”构成,Thedoctoradvisedmetoe
3、atmorevegetablesandfruit.（2）其否定形式是“not/nevertodo”,Thedoctoradvisedmenot/nevertosmoke（3）不定式可以带宾语或状语构成不定式短语,toeat/toeatmorehealthyfood不定式（4）不定式的逻辑主语有时用“for+名词或代词宾格”构成。It’skindofhertohelpmewithmyEnglish.It’simportantforustostudyhard.（5）没有人称和数的变化,但有时态和语态的变化.不定式可以作主语、宾语、状
4、语、表语和定语，但不能单独作谓语。不定式结构:todo(否定)not/nevertodo二.时态与语态主动语态被动语态一般式进行式完成式完成进行式不定式todotobedonetobedoingtohavedonetohavebeendonetohavebeendoing--------------------(1).Theypretendednottoseeus.(2).Hepretendedtobesleeping.(3).Shepretendedtohaveknownitbefore.(一般式表示与谓语的动作同时/几乎同时
5、/发生在它之后.)(在谓语动词发生的同时,不定式的动作也正在进行)(完成式表示动作发生在谓语动作之前)(4).We’rehappytohavebeenworkingwithyou.(完成进行式表示谓语动作发生之前,不定式的动作一直在进行而且可能之后也继续)1.作主语2.作宾语3.作宾语补足语4.作定语5.作状语6.作表语7.作独立成分8.与疑问词等连用三.用法/功能Toseeistobelieve.It’simportanttolearnEnglishwell.(1).主语单个不定式作主语时,谓语动词用单数若不定式太长,往往用i
6、t作形式主语,不定式置后.(2).表语Myjobistohelpthepatient.Yourtaskistocleantheclassroom.表语和主语互换位置，意思不变。Tohelpthepatientismyjob.Tocleantheclassroomisyourtask.（1）Iwanttogohome.Theworkersdemandedtogetbetterpay.(三)宾语常用动词不定式作宾语的动词有：提出学会的打算，要求答应来帮忙，Offer/learn/plandamand/agree/help准备决定遭拒
7、绝，敢于设法有希望，没能做到莫假装intend/decide/refusedare/manage/wishfail/pretend(2)主语+find(/feel/judge/think/make/consider)+it+形容词/名词+todosthIfounditnecessarytotalktohimagain.Ithinkitimportanttoreportthethingtotheteacher.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的某种形式,那么介词后的不定式不带
8、to,相反则带to.(1).Shecoulddonothingbutcry.(2).Ihavenochoicebuttogo.(3).Whatdoyouliketodobesidessleep.Theteachertoldmetocleantheblackboa
