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1、InfinitiveI have something important to announce.I want to have a rest.To finish the job ahead of the time , he worked day and night.My task is to help her tidy the room.Translate and tell us what they have in common.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,没有人称和数的变化,但有时态和语态的变化。不定式
2、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时用“for+名词或代词宾格”构成。不定式不定式1. 作主语作主语2. 作宾语作宾语3. 作宾语补足语作宾语补足语4. 作定语作定语5. 作状语作状语6. 作表语作表语7. 作独立成分作独立成分8. 与疑问词等连用与疑问词等连用三三.动词不定式在句中可充当的成分动词不定式在句中可充当的成分三三. 用法用法/ 功能功能To see is to believe.Its important to learn English well .(1). 主语主语单个不定式作主语时单个不定式作主语时, ,谓语动词用单数谓语动词用单数若不定
3、式太长若不定式太长, ,往往用往往用it it作形式主语作形式主语, ,不定式置后不定式置后. .My job is to help the patient.Your task is to clean the classroom.(2). 表语表语I want to go home.The workers demanded to get better pay.I found it necessary to talk to him again.(3) 宾语宾语think/ consider/ find it + adj.+ to do 常用动词不定式作宾语的动词有：常用动词不定式作宾语的动词有：
4、hope, refuse, learn, set outchoose, decide, agree, manage, pretend, plan. The teacher told me to clean the blackboard.I expect you to give me some help.(4). 宾补宾补五看五看 watch see look at observe notice三使三使 let make have 二听二听 listen to hear一感觉一感觉: feelwarn, tell, allow, help, ask, force等等e.g. I made him
5、 do his work.He was made to do his work (by me).注意注意1 help 后面的后面的“to”可省去可省去e.g. They often help the grandma (to) carry water.2 see, hear, watch, feel, notice, look at等表示等表示 感觉和感觉和let, make, have等表示使役的动词后等表示使役的动词后 面，不定式作宾语时要省面，不定式作宾语时要省“to” （注：被动（注：被动 语态不省语态不省to）3 不定式用在介词不定式用在介词but, except, besides后时
6、后时,如果这些介词前有行为动词如果这些介词前有行为动词do的的各种形式各种形式,那么介词后的不定式不带那么介词后的不定式不带to,相反则带相反则带to.(1). She could do nothing but cry.(2). I have no choice but to go.(3).What do you like to do besides sleep.I have something to say.He has a lot of homework to do .He is looking for a room to live in .There is nothing to worr
7、y about.(5). 定语定语(如果不定式中的动词是不及物动词如果不定式中的动词是不及物动词,则不定式中要有介词则不定式中要有介词.)请给我一支写字的笔请给我一支写字的笔.Please give me a pen to write with.不定式作定语时，应放在不定式作定语时，应放在被修饰词的后面被修饰词的后面，而，而且放在其他后置定语之后。且放在其他后置定语之后。1. 不定式做定语与所修饰的词之间有不定式做定语与所修饰的词之间有三种三种关系：关系：(1)动宾关系动宾关系 I have a lot of work to do.我有很多工作要做。我有很多工作要做。 (2)主谓关系主谓关系
8、He is always the first to come.他总是第一个来。他总是第一个来。 (3)同位关系同位关系 We all have a chance to go to college. 我们都有上大学的机会。我们都有上大学的机会。2. 作定语的不定式如果是作定语的不定式如果是不及物动词不及物动词，或，或者不定式所修饰的名词或代词是不定式动者不定式所修饰的名词或代词是不定式动作的地点工具等，不定式后面须有作的地点工具等，不定式后面须有相应的相应的介词介词。3. 不定式所修饰的名词如果是不定式所修饰的名词如果是time, place或或way，不定式后面的，不定式后面的介词习惯上要省去
9、介词习惯上要省去。 e.g. He is looking for a room to live in. 他在找一个房间住。他在找一个房间住。e.g. He had no money and no place to live. 他没钱没地方住。他没钱没地方住。4. something, anything, nothing, everything等复合不定代词常用不定式做后置定语。等复合不定代词常用不定式做后置定语。e.g. Do you have anything to send? 你有什么东西要寄吗你有什么东西要寄吗I came here to see you.He got up early
10、to catch the train.(6) 状语状语（表示目的或结果）（表示目的或结果）in order to , so as to ,enough to ,only to , too.to.,在一些短语中也有体现在一些短语中也有体现(7).独立结构独立结构to be frank, to be honest,To tell the truth, I dont agree with you.类似的结构类似的结构(8)(8)不定式与疑问词不定式与疑问词who,which, when, how, who,which, when, how, whatwhat等连用，在句中起名词作用，可充当主语、等连
11、用，在句中起名词作用，可充当主语、表语、宾语等。表语、宾语等。He didnt know what to say. .他不知道说什么。他不知道说什么。( (宾语宾语) ) How to solve the problem is very important. .如何解决这个问题很重要。如何解决这个问题很重要。( (主语主语) ) My question is when to start. .我的问题是什么时我的问题是什么时候开始。候开始。( (表语表语) )注意：注意：在与在与whywhy连用时，只用于连用时，只用于whywhy或或why notwhy not开头的简开头的简短疑问句中，后面紧
12、跟的动词不定式不带短疑问句中，后面紧跟的动词不定式不带toto。 Why not have a rest?关于不定式中的小品词关于不定式中的小品词to (1).不定式中的动词上文已出现过不定式中的动词上文已出现过,下文要下文要 省略该动词省略该动词. eg: Would you like to go with me ? Id like to .(2). 不定式是不定式是to be 结构结构, be 不可省不可省. eg: Would you like to be a teacher? Id like to be.1爱和被爱都是最大的幸福。爱和被爱都是最大的幸福。_ are both great
13、 happiness.2中国人民决不会征服。中国人民决不会征服。The Chinese people refuse _3据说他已经完成了他的工作。据说他已经完成了他的工作。He is said _.4 根据报道他们已安全到达。根据报道他们已安全到达。They are reported _To love and to be lovedTo love and to be lovedto give in/ be conqueredto give in/ be conqueredto have finished/completed his workto have finished/completed
14、his workto have arrived safelyto have arrived safely5 我想叫人立刻修理这辆自行车。我想叫人立刻修理这辆自行车。I want this bike _.6 玛利仿佛已经告诉这件事了。玛利仿佛已经告诉这件事了。Mary seemed _.7众所周知，奥运会上他被授予了一枚金牌。众所周知，奥运会上他被授予了一枚金牌。He is known _ a gold medal at the Olympic.to be repaired at once/ immediatelyto be repaired at once/ immediatelyto hav
15、e been told about itto have been told about itto have been givento have been given1.He was overheard that he hoped John would resign.2.Peter was made outside.3.He was heard the door and go out.4.The man was seen the woman on the street.5.The old lady was noticed her face with a handkerchief.to wait
16、to unlock to shoot to wipe to say 1.I forgot to ask you go to the bank.2.It is very important the electricity before you check the machine.3.I know how a mouse out of my handkerchief.4.Luckily, we dont have much more work .5.She was very pleased the opportunity to travel while she was young.6.She has been very successful in her work, and now her greatest wish is married and have a child.toto turn offto make to doto have to get
