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1、,限定,ow can you believe I can flike a bird?To see is to believeIts impossible for humansto fly like a birdnow,不定3不定式由“to+动词原形”构成,其否定形式是not/never to do”,不定式可以带宾语或状语构成不定式短语,没有称和数的变化,但有时态和语态的变化。不定式可以作主语、宾语、状语、表语和定语,但不能单独作谓语。不定式的逻辑主语有肘用“for+名词或代词宾格”构笔了,结构:todo(否定)not/never to do时态与语态不定式主动语态被动语态般式to doto
2、be done进行式to be doing完成式to have doneto have beendone完成进行式 to have been,(1).They pretended not to see us.(一般式表示与谓语的动作同时/几乎/发生在它之后)(2).He pretended to be sleeping(在谓语动词发生的同时不定式的动作也正在进行)(3).She pretended to have known it before完成式表示动作发生在谓语动作之前)(4).Were happy to have been working withou(完成进行式表示谓语动作发生之前不
3、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.作定语作状语.作表语7.作独立成分与疑间词等连用,用法/功能(1).主语To see is to believeIts important to learn English well单个不定式作主语时谓语动词用单部若不定式太长,用作形式主语,不定式置后(2).表语My job is to help the patientyour task(is to clean theclassroom,(3)宾语I want to go homeThe workers demanded to get better payi fo
4、und it necessary to talk to him againthink/consider/find it adj+to do常用动词不定式作宾语的动词有hope,refuse,learn,set outchoose,decide,agree,manage,pretend,plan,warn,tell,allow,help,ask,forceD(4).宾补The teacher told me to clean the blackboardI expect you to give me some help.watchlet五看see三使makelook athaveobservenoticesten to二听一感觉el已ar,意1help后面的“to”可省去e.g.They often help the grandma(to)carry water.2see,hear,watch,feel,notice,look at等表示感觉和et,make,have等表示使役的动词后面,不定式作宾语时要省“to”(注:被动语态不省to)e.g.I made him do his work.He was made to do his work(by me).,
