1、动词不定式语 境 自 主 领 悟先观察原句后自主感悟1.Unfortunately，the doctors dont know how to make me better，but I am very outgoing and have learned to adapt to my disability.2.Even after all that，no one could give my disease a name and it is difficult to know what the future holds.3.I am happy to have found many things I
2、 can do，like writing and computer programming.4.My ambition is to work for a firm that develops computer software when I grow up.5.I have a very busy life with no time to sit around feeling sorry for myself.1.例句1中的how to make为“疑问词动词不定式”结构，作动词know的宾语；to adapt为动词不定式的一般式，作动词learn的宾语。2.例句2中的不定式to know为真
3、正的主语，前面的it为形式主语。3.例句3中的to have found为不定式的完成式，作状语。4.例句4中的不定式to work作表语。5.例句5中的不定式to sit around作定语，不定式作定语位于所修饰的词之后。2.例句2中的不定式to know为真正的主语，前面的it为形式主语。动词不定式由“to动词原形”构成。这里的to是不定式标志，没有词义。不定式具有名词、形容词或副词的某些语法功能，又有动词的特点，可以有自己的宾语和状语，组成动词不定式短语。一、动词不定式的形式形式主动语态被动语态意义一般式to doto be done表示动作与谓语动作同时发生或发生在谓语动作之后完成式
4、to have doneto have been done表示动作发生在谓语动作之前进行式to be doing表示谓语动作发生时，不定式的动作正在进行I plan to attend the meeting to be held tomorrow.我打算参加明天举行的会议。(attend的动作在plan之后发生，且meeting与hold为被动关系)They are said to be studying psychology.据说他们正研究心理学。(be said与study同时发生)Im very sorry to have kept you sitting around doing n
5、othing.让你一直无所事事闲坐着我很抱歉。(keep发生在be sorry之前)No harm seems to have been done.似乎并没有什么危害发生。(do发生在seem之前，且harm与do之间是被动关系)名师点津(1)动词不定式的否定式在不定式符号to前加not；不带to的不定式则在动词前加not。Zhang Ming asked me not to stay at home all day.张明要我不要整天待在家里。My mother let me not do it by myself.妈妈让我不要独自做这件事。(2)“疑问词动词不定式”结构疑问词“what，ho
6、w，when，where，which动词不定式”结构可作主语、表语和宾语等。He didnt know what to ask.(宾语)他不知道该问些什么。My question is when to start.(表语)我的问题是何时开始。即时训练1用所给动词的适当形式填空They seem to have known(know)each other for a long time.They pretended to be working(work)hard when the teacher came in.I wanted the letter to be typed(type)at on
7、ce.二、不定式的句法功能动词不定式在句中不能独立作谓语，但可以作主语、宾语、宾语补足语、定语、表语和状语等多种成分。1作主语To talk with him is a great pleasure.和他谈话是一件非常愉快的事。名师点津(1)为了避免头重脚轻，在许多情况下，通常都将作主语的不定式置于句子后部，用it作形式主语，放在句首。(2)若要说明不定式的动作的执行者，可以在不定式前面加上“for/ofn./pron.”结构。当形容词表达事物的特征时用for sb.；当形容词表达人所具有的特征或品质时用of sb.，这样的形容词有careful，cruel，foolish，brave，goo
8、d，honest，kind，rude，polite，nice，stupid，wise，wrong等。Its very important for you to remember this.对你来说记住这一点很重要。Its very kind of you to help me.你能帮我真是太好了。2作表语不定式作表语主要有三种情况，一是用于seem，appear，prove，turn out等连系动词之后的不定式(尤其是to be)；二是像My job is to sweep the floor(我的工作就是擦地板)这样的主语与表语“等价”的情形；三是表示想法、约定、义务、命令、可能性、命运等
9、。He seems to be ill.他似乎有病。Her wish is to be a teacher.她的愿望就是当一名教师。We are to meet at the station at three.我们约定3点钟在车站见面。(表约定)3作宾语常接不定式而不接动名词作宾语的动词及短语有：“决心学会想希望”：decide/determine，learn，want，hope/wish/expect/long“设法假装在拒绝”：manage，pretend，refuse“主动答应选计划”：offer，promise，choose，plan“同意请求帮一帮”：agree，ask/beg，he
10、lp外加 afford，fail，would like/love，threaten。I cant afford to buy a car.我买不起汽车。I like swimming，but I dont like to swim this afternoon.我喜欢游泳，但我今天下午不想游泳。名师点津不定式作宾语后跟宾语补足语时，常把不定式后移而用形式宾语 it 代替，常见句式：think/believe/consider/find/feel，etc.itadj./n.不定式。I think it necessary to send for an expert.我认为请位专家来是有必要的。4
11、作宾语补足语通常可带不定式作宾语补足语的动词：advise，allow，ask，bear，beg，cause，command，encourage，expect，forbid，force，get，hate，help，intend，invite，leave，like，mean，need，oblige，order，permit，persuade，prefer，request，remind，teach，tell，trouble，want，warn，wish等。What caused him to change his mind?是什么使他改变主意的？He didnt allow the student
12、s to go there.他不允许学生们去那儿。5作定语I have a question to ask you.我有一个问题要问你。He is not a man to tell a lie.他不是个说谎的人。名师点津不定式与被修饰的词有动宾关系，且句中有该不定式的逻辑主语时，该不定式用主动形式表被动意义。如果这个不定式是不及物动词，其后应有相应的介词。The Browns have a comfortable house to live in.布朗一家有一幢舒适的房子可以居住。6作状语(1)动词不定式可以用作目的状语。注意其他非谓语动词形式不能用作目的状语。To succeed，one
13、must first of all believe in himself.要想成功，首先必须相信自己。(2)only to do sth.为不定式作结果状语，表示出乎意料的结果。We hurried to the station，only to be told that the train had left.我们急匆匆赶到车站，结果被告知火车已开走了。(3)形容词或过去分词作表语时，后面可接不定式作原因状语。常见词有：happy，lucky，glad，sorry，anxious，proud，disappointed，angry，surprised，ready，delighted，clever，
14、foolish，pleased，fortunate，right等。You will never know how happy I was to see her yesterday.你永远不会知道昨天看到她时，我是多么高兴。(4)在“主语系动词表语(形容词)to do”结构中，不定式的主动形式表示被动意义。该结构中常用的形容词有：easy，hard，difficult，important，impossible，interesting，pleasant，nice，comfortable，safe，dangerous等。The box is not easy to carry.这个箱子不易携带。7动
15、词不定式与疑问词who，which，when，where，how，what等连用，在句中起名词的作用，可充当主语、表语、宾语等。How to solve the problem is very important.如何解决那个问题很重要。(作主语)即时训练2用所给动词的适当形式填空It took years of work to reduce (reduce)the industrial pollution and clean the water.I heard a passenger behind me shouting to the driver，but he refused to sto
16、p (stop)until we reached the next stop.He is thought to have acted (act)foolishly.Now he has no one but himself to blame for losing the job.三、省略to的情况1在某些使役动词或感官动词后作宾语补足语的动词不定式，常不带to；如果这些动词用于被动结构，其后的to就必须补上。这类词可以用以下口诀助记：一感：feel二听：listen to，hear三让：make，have，let五看：see，watch，observe，look at，notice。I oft
17、en hear him sing the song.我经常听见他唱那首歌。He is often heard to sing the song.他经常被人听见唱那首歌。2在以why引导的疑问句中，表示建议，不定式不带to。Why congratulate her?为什么要祝贺她呢？Why not conduct the interview right now?为什么不马上主持面试呢？3在cannot but，cannot choose but，cannot help but之后的动词不定式不带to。I cannot but admire his courage.我只有佩服他的勇气。4动词不定式
18、在but，except，besides后面时，如果这些词之前有行为动词do，那么，这些词后的动词不定式不带to，否则要带to。She could do nothing but cry.她除了哭，不能做任何事。I have no choice but to work for the firm.除了为这家公司工作，我别无选择。What do you like to do besides swim?除了游泳，你还喜欢做什么？5为了避免重复，动词不定式可省去to。Im really puzzled about what to think or say.想什么，说什么，我确实困惑了。名师点津在expec
19、t，hope，wish，mean，prefer，forget，want，try以及be glad，be happy，would like，should love，would love等后面，常用to来代替前面的不定式，以避免重复。I havent conducted a performance but I wish to.我没有主持过演出，但是我希望。即时训练3用所给动词的适当形式填空I had nothing to do but wait (wait)outside of the gate.Why not turn (turn)off the gas at once?They couldnt
20、 choose but stay (stay)there.单句语法填空1I heard him playing(play)the violin in the next room just now.2Tom worked hard，only to fail (fail)again at last.3The question is very difficult to answer (answer).4The boy was seen to fall (fall)suddenly from the tree.5He pretended to be reading (read)the text whe
21、n I came in.6It is an honor for me to be invited (invite)to attend the meeting.7The goal of this activity is to meet (meet)the needs of common people.8The engine just wont start.Something seems to have gone (go)wrong with it.9Jack was in low spirits those days and his friends did all they could to c
22、heer (cheer)him up.10Martin showed no anxiety about the competition.He seemed to have prepared (prepare)for it pretty well.句型转换1It seems that he is eating something.(变为简单句)He seems to be eating something.2To study two languages is very hard.(用it作形式主语)Its very hard to study two languages.3The boss ma
23、de them work the whole night.(变为被动语态)They were made to work the whole night by the boss.4He wanted to shut the window.Tell him not to shut the window.(合并句子)He wanted to shut the window and tell him not to.5It is known that she has been working on the problem for many years.(变为简单句)She is known to have been working on the problem for many years.
