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1、学习必备欢迎下载一、动词不定式概念解析动词不定式动词不定式由“不定式符号to + 动词原形”构成，是动词的一种非谓语的形式，即其在句中不能单独作谓语；动词不定式具有以下属性：（1）动词不定式具有动词的性质，可以有自己的宾语和状语，也可以有时态和语态的变化；（2）动词不定式也具有非动词的性质，相当于一个名词、形容词或副词，可以在句中担任主语、宾语、宾语补足语、表语、定语和状语；二、动词不定式的形式1. 一般式：表示的动作通常与主要的谓语动作同时或几乎同时发生，或是在它之后发生；to do （主动）to be done（被动）2. 进行式：表示谓语的动作或情形发生时，不定式表示的动作正在进行；to
2、 be doing （主动）He pretended to be reading when I came in.3. 完成式：表示不定式的动作发生在谓语动作之前；to have done （主动）to have been done（被动） I m sorrtyo have lost your key.It has been an honor for me to have been invited to your country.4. 完成进行式：表示不定式的动作在谓语动作之前发生并始终进行着；to have been doing （主动）He was said to have been liv
3、ing in London for 20 years.三、动词不定式结构所充当的语法成分1. 作主语(1) 不定式短语在句中作主语To say is one thing and to do is another. To know oneself is difficult.(2) 用 it 作形式主语在许多情形下， 人们通常用 it 作为形式上的主语，而把不定式移到谓语之后，使句子结构显得平稳一些；It is important to learn English.It seemed a pity to have wasted so much time.2. 作表语不定式作表语说明主语的详细内容或
4、表示目的；His wish is to become an engineer. To live is to do something worthwhile.3. 作宾语(1) 作动词的宾语He wanted to go.Father likes to listen to music in silence.留意： 在 fell, find, make, think, consider等动词后， 假如宾语带有宾语补足语时，要用 it 作形式宾语，而把真正的宾语放在宾语补足语后；I find it interesting to study English.I think it impossible
5、to work out the problem.(2) 作介词的宾语不定式可作介词 but 和 except 的宾语；不定式在介词but, except 后面时，假如 but , except之前有行为动词 do 的各种形式，那么but, except 后的不定式不带 to，否就要带 to；I have no choice but to go.She could do nothing but cry.The teacher made no comments except to tell him to work hard.4. 作宾语补足语(1) 在表示感觉的动词以及使役动词后作宾语补足语，不定
6、式都不带 to；变为被动语态时，原不带 to 的不定式要变成带 to 的不定式；这类动词可以表述如下：“一感 feel 、 二听 hear, listen to 、三让 let, have, make 、四观看 see, observe, watch, look at”；I often hear him sing the song. Did you see him go out.She made him give up smoking.Let him do whatever he wishes to do.(2) 在表示心理状态的动词后作宾语补足语, 这时不定式通常是“ to be +形容词或
7、名词” 的结构；这类动词有： consider, think, believe, find, imagine, judge, suppose, prove等； consider,think, find后的 to be 常可省略；We consider him to be a good teacher.I thought her to be nice and honest the first time I met her.5. 作定语不定式作定语通常放在其修饰的名词或代词之后，与被修饰的名词或代词之间可以是主谓（主动）关系、动宾关系、同位关系；The next train to arrive w
8、as from New York. the next train与 arrive 间是关系 He has a lot of letters to write. to write与 a lot of letters 之间是关系 She has a child to take care of. to take care of 与 a child 之间是关系 He broke his promise to write to his parents regularly.his promise 与 to write to his parents 之间是关系 四、动词不定式的特殊用法1. 用作独立结构有一
9、些不定式短语并不做句中成分，是说话人心理态度的表露（语法将之称为独立结构）；如：To be honest, we are not sure to work out the problem. To be frank , I don t agree with you.这类动词不定式有： to tell you truth （说老实话）、 to begin with （第一）、 to say nothing of（姑且不说）、 to be sure（诚然，当然）、 to make a long story short（长话短说）、 to be brief（简言之）、 to conclude（总而言之
10、）；2.“疑问词 +不定式”结构疑问词 who, what, which, when, where, how, why后加动词不定式构成不定式短语 ，它在句中作主语、宾语和表语；How to solve the problem is very important.（主语）He didn t knowwhat to say.（宾语）My question is when to start. （表语）3. “ It is+形容词 +for/of sb.+ 不定式 ”结构(1) 在“ It is +形容词 + of sb. + 不定式”的结构中，形容词往往表示人物的性格和特点，如： kind, si
11、lly, good, clever, wrong, right, foolish, careless, impolite, honest, bad等；It is kind of you to think so much of me. You are kind. It is foolish of you to say that. You are foolish.(2) 在“ It is +形容词 + for sb. + 不定式”的结构中，形容词往往表示事物的性质,如：important, possible, impossible, necessary, difficult, hard, reas
12、onable等；It is necessary for you to complete the program on time. Sth. is necessary. It is hard for him to get rid of his bad habits. Sth. is hard.五、动词不定式中to 的省略1. 在 had better, had best, would rather, would ratherhan, would soonetr, cannot but, cannothelp but 等结构后直接跟动词原形或“not+ 动词原形”；You d bettelrist
13、en to your teacher s opinion.He cannot but move to another street. We cannot help but admire his courage.He always prefers to ride a bicycle rather than ride on a crowded bus.2. 两个不定式并列使用时，为了防止重复，后面的不定式符号to 可省略；The little girl hardly knew whether to laugh or cry.Can you help me to call him and ask h
14、im to attend the meeting.3. Why do . 一般表批评； Why not do .？一般表建议；如： Why make so much noise.Why not have a rest.六、 动词不定式中 to 的保留为了防止重复上文中显现过的动词，可以用不定式符号to 来代替上文中显现过的不定式结构；(1) 在助动词或情态动词之后，如 be going to, used to, have to, ought to, be able to, be about to 等;She must go, but you don t have togo. He doesn
15、t like fish but huesed to like.(2) 在 want, decide, like, love, hope, wish, mean, refuse, try等动词之后 ; You may go with them if you hope to go. Did you go to see the Great Wall. I wanted to go, but I was too busy.(3) 在 ask, tell, order, advise, persuade, warn, wish, permit, allow等动词之后用作宾补的不定式： :Don t do anything unles your father tells you to do. May I use your car. No, I donaltlow you to use.(4) 在对话答语中的 happy, glad, anxious, willing, ready,
