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GrammarInfinitiveInfinitive 不定式由不定式由不定式由不定式由“to+to+动词原形动词原形动词原形动词原形”构成构成构成构成即即即即:to doto do，其否定形式是其否定形式是其否定形式是其否定形式是“not to donot to do”，不定式可作不定式可作不定式可作不定式可作主语主语主语主语、宾语宾语宾语宾语、状语状语状语状语、表语表语表语表语和和和和定语定语定语定语、宾补宾补宾补宾补 ，但不能单独作，但不能单独作，但不能单独作，但不能单独作谓语谓语谓语谓语。To see is to believe 眼见为实。眼见为实。1.不定式的用法：不定式的用法：(1)作主语作主语Seeing is believing.to do 与与doing要前后对应要前后对应It is right to give up smoking.戒烟是对的。戒烟是对的。主主语语不定式短语作主语时，用不定式短语作主语时，用it作形式作形式主语。主语。He wanted to go他想走。他想走。(2)作宾语作宾语I find it interesting to work with him.我发现和他一起工作有趣。我发现和他一起工作有趣。不定式短语作宾语时，如果带有宾不定式短语作宾语时，如果带有宾语语 补足语，用补足语，用it作形式宾语。作形式宾语。He asked me to do the work with him(3)作宾补作宾补The boss made him work 12 hours a day.I saw him go into the classroom.注意注意在在feel,hear,listen to,look at,notice,observe,see,watch/have,let,make 等感官和使役动词后的补足语中等感官和使役动词后的补足语中,不定式不定式 省略省略to。He was made to work 12 hours a day by the boss.He was seen to go into theclassroom.变成被动时，必须加上变成被动时，必须加上to。(4)作定语作定语 I have some books for you to read.He is looking for a room to live in There is nothing to worry aboutPlease give me a knife to cut with 但不定式所修饰的名词如果是但不定式所修饰的名词如果是time，place或或way，后面的介词要省略。，后面的介词要省略。e.g.He had no money and no place to live This is the best way to do that.注注：作定语的不定式如果是不及物动：作定语的不定式如果是不及物动词，不定式后面须有相应的介词。词，不定式后面须有相应的介词。I came here to see youWe were very excited to hear the newsHe hurried to the school to find nobody there.To look at him，you would like him(5)作状语作状语(目的目的)(原因原因)(结果结果)(条件条件)(6)作表语作表语 My job is to help the patient.(7)疑问词疑问词who,which,when,where,how，what等可与不定式连用，等可与不定式连用，e.g.He didnt know what to say.How to solve the problem is very important?My question is when to start(宾语宾语)（主语）（主语）(表语表语)但但:与与why连用时连用时,Why not do sth?e.g.Why not have a rest?She could do nothing but cry 她只会哭了。她只会哭了。I have no choice but to go 除了走我别无选择。除了走我别无选择。There seemed to be nothing else to do but send for a doctor.似乎能做的只有请医生。似乎能做的只有请医生。but do but to do but do 介词介词but后可跟不定式，如果后可跟不定式，如果其前有行为动词其前有行为动词do的各种形的各种形式，不定式要省略式，不定式要省略to，否则要，否则要加上加上to。不定式的逻辑主语可用不定式的逻辑主语可用“for sb 或或of sb”构成。构成。Its improtant for us to learn English well.It is kind of you to help me.不定式不定式没有人称和数的变化，但有时态没有人称和数的变化，但有时态和语态的变化。和语态的变化。不定式的时态不定式的时态 (1)不定式的动作与谓语动作同时不定式的动作与谓语动作同时(或或几乎同时几乎同时)发生，用其一般式发生，用其一般式(to do/do)。e.g.I saw him go out我看见他出去了。我看见他出去了。(2)如果谓语动作如果谓语动作(情况情况)发生时，不定发生时，不定式的动作正在进行，要用其进行式式的动作正在进行，要用其进行式(to be doing)。e.g.I am very glad to be working with you 很高兴和你一起工作。很高兴和你一起工作。(3)如果不定式的动作发生在谓语动词如果不定式的动作发生在谓语动词之前，要用其完成式之前，要用其完成式(to have done)。e.g.Im sorry to have kept you waiting 对不起让你久等了。对不起让你久等了。下列动词可接不定式也可接动名词作宾下列动词可接不定式也可接动名词作宾语，但意义完全不同：语，但意义完全不同：forgetrememberregrettrygo onstopmean
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