英文中不定式是什么意思
I want to go away.to go away就是不定式不定式一般指to do这种结构，一般表示目的==========================================详细的介绍如下：参考来源：[编辑本段][（动词）不定式的简介] 1. 不定式定义:由to＋动词构成。
不定式是一种非限定性动词。
而非限定动词是指那些在句中不能单独充当谓语的动词，可分为不定式，动名词，现在分词和过去分词。
2.用途： 在句中不能作谓语。
它具有动词的性质，本身可以带宾语和状语。
【动词不定式】 1.定义：动词 + 不定式 2.用途： 动词不定式在句中可以作句子任何成分。
动词不定式的被动形式除了一般形式外还有其完成式和进行式。
[编辑本段][动词不定式的时态、语态] 动词不定式可以作以上各种成分，但它毕竟是动词，所以有动词的属性 动词不定式及其短语还可以有自己的宾语、状语，虽然动词不定式在语法上没有表面上的直接主语，但它表达的意义是动作，这一动作一定由使动者发出。
这一使动者我们称之为 逻辑主语，其形式如下： 主动形式 被动形式 一般式 （not) to make （not) to be made 完成式 （not) to have made ( not) to have been made 进行式 （not) to be making （not） to have been making (1)语态 如果动词不定式的逻辑主语是这个不定式所表示的动作的承受者，不定式一般要用被动语态形式。
如： It's a great honour to be invited to Mary's birthday party.（不定式作主语） It was impossible for lost time to be made up.（不定式作主语） I wish to be sent to work in the country.（不定式作宾语） Can you tell me which is the car to be repaired?（不定式作定语） He went to the hospital to be examined.（不定式作状语） 在There be结构中，修饰主语的不定式可用被动，也可用主动。
如：There are still many things to t ake care of (to be taken care of).但有时两种形式表达的意思不同，如：These is nothing to do now.( We have nothing to do now.) There is nothing to be done now.(We can do nothing now.) (2)时态 1) 现在时：一般现在时表示的动词，有时与谓语动词表示的动作同时发生，有时发生在谓语动词的动作之后。
He seems to know this. I hope to see you again. = I hope that I'll see you again. 我希望再见到你。
2) 完成时：表示的动作发生在谓语动词表示的动作之前。
I'm sorry to have given you so much trouble. He seems to have caught a cold. 3) 进行时： 表示动作正在进行，与谓语动词表示的动作同时发生。
He seems to be eating something. 4) 完成进行时： She is known to have been wreaking on the problem for many years.[编辑本段][疑问词＋不定式结构] 疑问词who,what,which,when,where,whether,how后可接不定式构成不定式短语，在句中作主语、宾语、表 语等。
如： ①When to leave for London has not been decided yet. （不定式在句子中做主语） ②Mr. Smith didn't know whether to leave or stay there. （不定式在句子中做宾语） ③I asked Professor Xu how to learn English well. （不定式在句子中做间接宾语） ④The question was where to get the medicine needed. （不定式在句子中表语） 以上例句中疑问词＋不定式部分，均可转换为相应的从句形式。
如：①When we shall leave…③…how I could learn… 经常在这种结构中使用的动词有：consider,decide,discover,explain,find out,forget,hear,know,lea rn,observe,understand,wonder等。
[编辑本段][动词不定式的语法功能] 一、作主语 动词不定式作主语时，句子的谓语动词常用单数，其位置有以下两种： (1)把不定式置于句首。
如： To get there by bike will take us half an hour. (2)用it作形式主语，把真正的主语不定式置于句后，常用于下列句式中。
如： ①It＋be＋名词＋to do It's our duty to take good care of the old. ②It takes sb+some time+to do How long did it take you to finish the work? ③It＋be＋形容词＋for sb＋to do It is difficult for us to finish writing the compositionin a quarter of an hour. ④It＋be＋形容词＋of sb＋to do It is stupid of you to write down everything the teachersays. ⑤It seems(appears)＋形容词＋to do It seemed impossible to save money. 在句型③中，常用表示客观情况的形容词，如：difficult,easy,hard,important,impossible,necessary 等；在句型④中，常用careless,clever,good,foolish,honest,kind,lazy,nice,right,silly,stupid,wise等 表示赞扬或批评的词。
在不定式前的sb，可看作其逻辑主语。
这一句式有时相当于Sb is＋形容词＋to do句式 ，如：It'skind of you to help me with my English.=You are kind to helpme with my English. (3)举例 1） It's easy (for me) to do that.我做这事太容易了 easy, difficult, hard, important, possible, impossible, comfortable, necessary, better; the first, the next, the last, the best, too much, too little, not enough It's so nice to hear your voice. 听到你的声音真高兴。
It's necessary for you to lock the car when you do not use it. 当你不用车的时候，锁车是有必要的。
2) It's very kind of him to help us. 他帮助我们，他真好。
Kind, nice, stupid, rude, clever, foolish, thoughtful, thoughtless, brave, considerate(考虑周到的), silly, selfish(自私的) 例句: It was silly of us to believe him. 我们真愚蠢，竟然相信了他。
It seemed selfish of him not to give them anything. 他不给他们任何东西，这显得太自私了。
注意：1) 其他系动词如，look，appear等也可用于此句型 2) 不定式作为句子成分时，动词用单数形式。
3) 当不定式作主语的句子中又有一个不定式作表语时，不能用It is… to…的句型 (对)To see is to believe. 百闻不如一见。
(错)It is to believe to see. 二、作宾语 1) 动词+ 不定式 afford. aim. appear. agree. arrange . ask . be . decide. bother . care . choose . come. dare. demand. desire. determine . expect. elect . endeavor .hope. fail . happen . help . hesitate .learn . long . mean. manage . offer . ought. plan . prepare. pretend . promise. refuse. seem. tend. wait . wish. undertake. 举例： The driver failed to see the other car in time. 司机没能及时看见另一辆车。
I happen to know the answer to your question. 我碰巧知道你那道问题的答案。
2）动词+不定式 ；动词+宾语+不定式 ask, beg, choose, expect , hate, help intend like, love, need prefer, prepare, promise, want, wish… I like to keep everything tidy. 我喜欢每件东西都保持整洁。
I like you to keep everything tidy. 我喜欢你使每件东西都保持整洁。
I want to speak to Tom. 我想和汤姆谈话。
I want you to speak to Tom. 我想让你和汤姆谈话。
3） 动词+疑问词+ to decide, know, consider forget, learn, remember, show, understand, see, wonder, hear, find out, explain, tell Please show us how to do that. 请演示给我们如何去做。
There are so many kinds of tape-recorders on sale that I can't make up my mind which to buy.有这么多的录音机，我都拿不定主意买哪一种。
注意:疑问词带不定式在句中作成分时，谓语动词用单数。
The question is how to put it into practice. 问题是怎样把它付诸实施。
4)以下动词后，只能跟不定式作宾语。
如：agree,ask,aim,arrange,choose,decide,demand,expect,fail ,help,hope,learn,long,manage,offer,plan,prepare, pretend,promise,refuse,wish 等，这些词大部分可接that引导的从句。
如： I decided to ask for my money back. I decided that I would ask for my money back. When our visit to the farm was over,we expected to startback on foot. When our visit to the farm was over, we expected that wewould start back on foot. 5)当复合宾语中的宾语是不定式时，先用形式宾语it代替不定式，把不定式置于补语之后，即：主语＋动 词＋it＋补语＋to do句式。
如： We think it quite important for us to learn a foreignlanguage well. He feels it his duty to help the poor. 三、作补语 1) 动词+宾语+不定式(to do) advise allow appoint believe cause challenge command compel consider declare drive enable encourage find forbid force guess hire imagine impel induce inform instruct invite judge know like order permit persuade remind report request require select send state suppose tell think train trust understand urge warn 例句： a. Father will not allow us to play on the street. 父亲不让我们在街上玩耍。
b. We believe him to be guilty. 我们相信他是有罪的。
Find 的特殊用法： Find 后可用分词做宾补，或先加形式宾语，再加形容词，最后加带to 的动词不定式。
find后也可带一个从句。
此类动词还有get，have。
I found him lying on the ground. I found it important to learn. I found that to learn English is important. 典型例题: The next morning she found the man ___ in bed，dead. A. lying B. lie C. lay D. laying 答案：A.find的宾语后面，用分词或分词短语，起宾语补足语作用。
现在分词表达主动，也表达正在进行，过去分词表达被动。
2) to + be 的不定式结构，作补语的动词。
Acknowledge, believe, consider, think, declare(声称), discover, fancy(设想), feel find, guess, judge, imagine, know, prove, see(理解), show, suppose, take(以为), understand We consider Tom to be one of the best students in our class. 我们认为汤姆是班上最好的学生之一。
典型例题 Charles Babbage is generally considered ___ the first computer. A. to invent B. inventing C. to have invented D. having invented 答案：A. 由consider to dosth. 排除B、D。
. 此句只说明发明这一个事实，不定式后用原形即可。
而C为现在完成时，发明为点动词一般不用完成时，且此处也不强调对现在的影响，因此不选C。
3) to be +形容词 Seem, appear, be said, be supposed, be believed, be thought, be known, be reported, hope, wish, desire, want, plan, expect, mean… The book is believed to be uninteresting. 人们认为这本书没什么意思。
4) there be+不定式 believe, expect, intend, like, love, mean, prefer, want, wish, undrstand We didn't expect there to be so many people there.我们没料到会有那么多人在哪里。
有些动词需用as 短语做补语，如regard, think believe, take, consider. We regard Tom as our best teacher. 我们认为汤姆是我们最好的老师。
Mary took him as her father . 玛丽把他当作自己的父亲。
四、作表语 不定式作表语表示具体动作或将来动作；动名词作表语表示抽象的一般行为。
①To be kind to the enemy is to be cruel to the people. ②My chief purpose is to point out the difficulties ofthe matter. ③What I would suggest is to put off the meeting. 当主语和表语都是不定式时，其含义一是条件，一是结果（例①）。
当主语是aim,duty,hope,idea,mista ke,plan,purpose,suggestion等为中心词的名词词组（例②）时，或以what引导的名词性分句（例③），不定 式说明主语的内容。
④Our work is serving the people. ⑤What he likes is taking a walk after supper. ⑥The story told by Mr.Wang is interesting. ④⑤句动名词作表语，与主语部分可以转换，如Serving thepeople is our work,而⑥句中是现在分词作 表语，说明主语的性质、状态，现在分词具有形容词的各种特征，另外，动名词作表语还应与进行时态区别开 来。
五、作状语 1）目的状语 To… only to (仅仅为了), in order to, so as to, so(such)… as to… (如此……以便……) He ran so fast as to catch the first bus. 他飞快地跑以便赶上第一班车。
I come here only to say good-bye to you. 我来仅仅是向你告别。
2）作结果状语，表事先没有预料到的，要放在句子后面。
What have I said to make you angry. He searched the room only to find nothing. 3) 表原因 I'm glad to see you. 典型例题 The chair looks rather hard, but in fact it is very comfortable to ___. A. sit B. sit on C. be seat D. be sat on 答案：B. 如果不定式为不及物动词，其后应有必要的介词。
当动词与介词连用时，常位于形容词+动词不定式结构的末尾。
六、作定语 ⒈不定式作定语 不定式在句中作定语，置于被修饰的名词或代词之后。
如： ①The next train to arrive is from Washington. ②Have you anything to be taken to your sister? ③Do you have anything to say on the question? ④Would you please give me some paper to write on? ⑤My wish to visit France has come true at last. 不定式短语作定语和被修饰词之间表示以下关系： (1)表示将来的动作（例①）。
(2)与被修饰词之间有动宾关系，如是不及物动词，则需加介词（例④）。
(3)与被修饰词之间有动宾关系，同时与句中其它词之间又有逻辑上的主谓关系时，尽管有被动含义，却仍 用主动语态（例③）；如只有动宾关系，而无逻辑上的主谓关系，则需用被动语态（例②）。
(4)不定式作定语时，一般可转换为定语从句，例①to arrive=that will arrive。
[编辑本段][省to 的动词不定式] 1） 情态动词 ( 除ought 外，ought to)： 2） 使役动词 let, have, make： 3） 感官动词 see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后作宾补，省略to。
注意：在被动语态中则to 不能省掉。
I saw him dance. =He was seen to dance. The boss made them work the whole night. =They were made to work the whole night. 4） 表示个人意愿或倾向的would rather，had better，might(just) as well：rather than置于句首时。
Rather than ride on a crowded bus,he always prefers to ride a bike. 5） Why… \\\/ why not…： 6） help 可带to，也可不带to, help sb (to) do sth： 7） but和except：but前是动词do时，后面出现的动词用不带to的动词不定式。
8） 由and, or和than连接的两个不定式，第二个to 可以省去： 9） 通常在discover, imagine, suppose, think, understand等词后，可以省去to be： He is supposed (to be) nice. 他应该是个好人。
10）but作介词，后接不定式结构时，前面谓语动词部分若含有do的形式时，but后的不定式要省去to，否则要带to。
He wants to do nothing but go out. He wants to believe anything but to take the medicine. 11）当两个或多个不定时短语由连词and，but或or连接时，后一个或几个不定式符号to常省略。
但若表示对比、对照关系时，则不能省略。
He wants to move to France and marry the girl. The purpose of new technologies is to make life easier,not to make it more difficult. 12）不定式做表语时，一般要带to，但若主语部分中含有do的各种形式时，符号to可省去。
We've missed the last bus.All we could do now is walk home. 典型例题 1) ---- I usually go there by train. ---- Why not ___ by boat for a change? A. to try going B. trying to go C. to try and go D. try going 答案：D. why not 后面接不带to 的不定式，因此选D。
2） Paul doesn't have to be made ___. He always works hard. A. learn B. to learn C. learned D. learning 答案：B. make后接不带to 的动词不定式，当其用于被动时，to 不可省略。
[编辑本段][动词不定式的否定式] Tell him not to shut the window… She pretended not to see me when I passed by. 我走过的时候，她假装没看见。
典型例题 1）Tell him ___ the window. A. to shut not B. not to shut C. to not shut D. not shut 答案：B。
tell sb to do sth 的否定形式为tell sb not to do sth. 2) She pretended ___ me when I passed by. A. not to see B. not seeing C. to not see D. having not seen 答案：A。
pretend 后应接不定式。
其否定形式为pretend not to do sth.。
3）Mrs. Smith warned her daughter ___ after drinking. A. never to drive B. to never driver C. never driving D. never drive 答案：A。
warn sb to do sth. 的否定形式为warn sb not to do sth. 此处用的是否定词never. 4) The boy wanted to ride his bicycle in the street，but his mother told him ____. A. not to B. not to do C. not do it D. do not to 答案：A。
not to 为not to do it 的省略形式。
可以只用to这个词，而不必重复整个不定式词组。
及物动词do后应有名词、代词等，否则不对，因此B，D不对。
5) The patient was warned ___ oily food after the operation. A. to eat no B. eating not C. not to eat D. not eating 答案：C。
warn一词要求后用不定式，此处为不定式的被动，否定形式为be warned not to do。
[编辑本段][不定式的特殊句型] 1、不定式的特殊句型so as to 1） 表示目的；它的否定式是so as not to do。
Tom kept quiet about the accident so as not to lose his job. 汤姆对事故保持沉默是为了不丢掉他的工作。
Go in quietly so as not to wake the baby. 轻点进去，别惊醒了婴儿。
2) so kind as to ---劳驾 Would you be so kind as to tell me the time? 劳驾，现在几点了。
2、 Why not +动词原形表达向某人提出建议 为什么不……? 干吗不……? 例如： Why not take a holiday? 干吗不去度假? 3、It's for sb.和 It's of sb. 1）for sb. 常用于表示事物的特征特点，表示客观形式的形容词，如easy, hard, difficult, interesting, impossible等： It's very hard for him to study two languages. 对他来说学两门外语是很难的。
2）of sb的句型一般用表示人物的性格，品德，表示主观感情或态度的形容词，如good, kind, nice, clever, foolish, right。
It's very nice of you to help me. 你来帮助我，你真是太好了。
for 与of 的辨别方法： 用介词后面的代词作主语，用介词前边的形容词作表语，造个句子。
如果道理上通顺用of，不通则用for。
如： You are nice. (通顺，所以应用of)。
He is hard. (人是困难的，不通，因此应用for。
) 4、不定式的特殊句型too…to… 1）too…to 太…以至于… He is too excited to speak. 他太激动了，说不出话来。
---- Can I help you ? 需要我帮忙吗? ---- Well, I'm afraid the box is too heavy for you to carry it, but thank you all the same. 不用了。
这箱子太重，恐怕你搬不动。
谢谢您。
2) 如在too前有否定词，则整个句子用否定词表达肯定， too 后那个词表达一种委婉含义，意 为不太。
It's never too late to mend. (谚语) 改过不嫌晚。
...更多更复杂的可以去百度百科看一下 ======================简单来说I want to go away.to go away就是不定式不定式一般指to do这种结构，一般表示目的
关于告别的句子
1.别离，有点难舍，但不怅然；有点遗憾，但不悲观。
因为相逢的希望在安慰。
2.不要说珍重，不要说再见，就这样，默默地离开。
但愿，在金色的秋季，友谊之树上将垂下丰硕 的果子。
3.挥手告别，扬帆远航，别不了的，是你抛出的那根友谊的缆绳，无形中牢牢地系在我心上。
4.即将分别，要说的话太多太多，千言万语化作一句--毋忘我。
李白写了一首对飞舟过三峡的动态美做了绝妙的描述,这是哪首诗
的诗句中描写飞舟过三峡的动态美的是“轻舟已过万重山”。
这是的中的诗句，原诗如下：，千里江陵一日还。
两岸猿声啼不住，轻舟已过万重山。
译文：清晨，我告别高入云霄的白帝城；江陵远在千里，船行只一日时间。
两岸猿声，还在耳边不停地啼叫；不知不觉，轻舟已穿过万重青山。
赏析：首句“彩云间”三字，描写白帝城地势之高，为全篇描写下水船走得快这一动态蓄势。
“彩云间”的“间”字当作隔断之意，诗人回望云霞之上的白帝城，以前的种种恍如隔世。
一说形容白帝城之高，水行船速全在落差。
如果不写白帝城之高，则无法体现出长江上下游之间斜度差距之大。
白帝城地势高入云霄，于是下面几句中写舟行的迅捷、行期的短暂、耳（猿声）目（万重山）的不暇迎送，才一一有着落。
“彩云间”也是写早晨景色，显示出从晦暝转为光明的大好气象，而诗人便在这曙光初灿的时刻，怀着兴奋的心情匆匆告别白帝城。
第二句的“千里”和“一日”，以空间之远与时间之短作悬殊对比。
这里，巧妙的地方在于那个“还”字上。
“还”，归来的意思。
它不仅表现出诗人“一日”而行“千里”的痛快，也隐隐透露出遇赦的喜悦。
江陵本非的家乡，而“还”字却亲切得如同回乡一样。
一个“还”字，暗处传神，值得读者细细玩味。
第三句的境界更为神妙。
古时，“常有高猿长啸”。
诗人说“啼不住”，是因为他乘坐飞快的轻舟行驶在长江上，耳听两岸的猿啼声，又看见两旁的山影，猿啼声不止一处，山影也不止一处，由于舟行人速，使得啼声和山影在耳目之间成为“浑然一片”，这就是李白在出峡时为猿声山影所感受的情景。
身在这如脱弦之箭、顺流直下的船上，诗人感到十分畅快和兴奋。
清代桂馥称赞：“妙在第三句，能使通首精神飞越。
”（）瞬息之间，“轻舟”已过“万重山”。
为了形容船快，诗人除了用猿声山影来烘托，还给船的本身添上了一个“轻”字。
直说船快，那便显得笨拙；而这个“轻”字，却别有一番意蕴。
三峡水急滩险，诗人溯流而上时，不仅觉得船重，而且心情更为滞重，“三朝上黄牛，三暮行太迟。
三朝又三暮，不觉鬓成丝”（）。
如今顺流而下，行船轻如无物，船的快速读者可想而知。
而“危乎高哉”的“万重山”一过，轻舟进入坦途，诗人历尽艰险、进入康庄旅途的快感，也自然而然地表现出来了。
这最后两句，既是写景，又是比兴，既是个人心情的表达，又是人生经验的总结，因物兴感，精妙无伦。
全诗给人一种锋棱挺拔、空灵飞动之感。
然而只看这首诗的气势的豪爽，笔姿的骏利，还不能完备地理解全诗。
全诗洋溢的是诗人经过艰难岁月之后突然迸发的一种激情，所以在雄峻和迅疾中，又有豪情和欢悦。
快意，给读者留下了广阔的想象余地。
为了表达畅快的心情，诗人还特意用上平“删”韵的“间”、“还”、“山”来作，使全诗显得格外悠扬、轻快，回味悠长。
催人泪下的高中告别句子
1、我们不分离，轻声地再见，心里存着感谢，感曾给过我一份深厚的情谊。
2、我们用双手紧紧地握别，让感觉在手中轻轻撩过，共享一份难忘的温馨…… 3、一声汽笛，跌落在旷野；无限的惆怅与孤独，在别离的那一刻，一齐从心头滋生。
4、本以为自己可以很从容,本以为可以什么都放得下。
5、彼此间不需要再多的言语,这一刻,只要紧紧的拥抱就够了。
6、毕业的时候我也找了好长时间，后来终于找到了，希望能帮到你。
7、不要说珍重，不要说再见，就这样，默默地离开。
但愿，在金色的秋季，友谊之树上将垂下丰硕 的果子8、大学3年里,感谢你们一直陪伴着我.照顾着我.让我在这距离家2000公里外的地方依然体会到家的温暖。
9、但是,面对3年的同学,许多熟悉而又陌生的面孔,这一辈子,可能也是最后一次见到了。
10、但我希望,在某年,我们重逢时能够很会心的一笑,大学一年,你们带给我很多快乐.曾经的不愉快,我们都把它遗忘。
11、当你再重温我们在一起的旧梦时，那时只有寄托于千里之明月。
12、多年离别后，抑或再相逢，相逢何所语
泪流默无声。
13、分别在即，纵有千言万语一时凝噎，只好挚手相看泪眼……也许你神往于雪山的颜色 开一朵雪白的花 象心一样纯洁14、也许你酷爱太阳的火力 开一朵火红的花 象梦一样美丽15、分离之际，愿我们俩友情万古长青
清静的湛教校园，你我朝夕相处，笔墨相亲，晨昏欢笑，情如手足，义重泰山，怎奈光阴流逝，岁月不返。
16、感谢所有所有大学这3年来的同学们,我会记得,一辈子的记得。
17、刚才在华都大酒店搞了毕业酒会。
18、很想很想,把每个人的脸都努力的记在脑海里。
19、离别，能使浅薄的感情削弱，却使深挚的感情更加深厚，正如风能吹灭烛光，却会把火扇得更 旺。
20、流水匆匆，岁月匆匆，唯有友情永存心中。
朋友，再见
朋友，珍重
21、明晨行别，但愿云彩，艳阳一直陪伴你走到远远的天涯；鲜花，绿草相随你铺展远远的前程。
22、朋友，你喜欢星空吗
如果有一天你在远方流浪时感到孤独、忧郁，请抬头看看星空，那儿有我送给你的幸运星。
23、朋友，再会
朋友，珍重
流水匆匆，岁月匆匆，唯有支情永存心中。
短暂的离别,是为了更好的相遇。
我该怎么答复
如果世间所有的相遇都是久别重逢，那么短暂的离别是为了下一次更美好的重逢，两情若是长久时，又岂在朝朝暮暮
English Grammer
动词不定式的简介 动词不定式是一种非限定性动词，由to＋动词原形构成，但在有些情况下to可以省略。
它还是属于动词，本身可以带宾语和状语。
动词不定式在句中可以作主语、宾语、表语、定语和状语，还可用在复合结构中，而且有完成式、进行式、完成进行式和否定形式。
动词不定式的被动形式除了一般形式外还有其完成式和进行式。
动词不定式的时态、语态 动词不定式可以作以上各种成分，但它毕竟是动词，所以有动词的属性 动词不定式及其短语还可以有自己的宾语、状语，虽然动词不定式在语法上没有表面上的直接主语，但它表达的意义是动作，这一动作一定由使动者发出。
这一使动者我们称之为 逻辑主语，其形式如下： 主动形式 被动形式 一般式 （not） to make （not） to be made 完成式 （not） to have made （not） to have been made 进行式 （not） to be making 完成进行式 （not） to have been making (1)语态 如果动词不定式的逻辑主语是这个不定式所表示的动作的承受者，不定式一般要用被动语态形式。
如： It's a great honour to be invited to Mary's birthday party.（不定式作主语） It was impossible for lost time to be made up.（不定式作主语） I wish to be sent to work in the country.（不定式作宾语） Can you tell me which is the car to be repaired?（不定式作定语） He went to the hospital to be examined.（不定式作状语） 在There be结构中，修饰主语的不定式可用被动，也可用主动。
如：There are still many things to t ake care of (to be taken care of).但有时两种形式表达的意思不同，如：These is nothing to do now.( We have nothing to do now.) There is nothing to be done now.(We can do nothing now.) (2)时态 1) 现在时：一般现在时表示的动词，有时与谓语动词表示的动作同时发生，有时发生在谓语动词的动作之后。
He seems to know this. I hope to see you again. = I hope that I'll see you again. 我希望再见到你。
2) 完成时：表示的动作发生在谓语动词表示的动作之前。
I'm sorry to have given you so much trouble. He seems to have caught a cold. 3) 进行时： 表示动作正在进行，与谓语动词表示的动作同时发生。
He seems to be eating something. 4) 完成进行时： She is known to have been wreaking on the problem for many years. 疑问词＋不定式结构 疑问词who,what,which,when,where,whether,how后可接不定式构成不定式短语，在句中作主语、宾语、表 语等。
如： ①When to leave for London has not been decided yet. ②Mr. Smith didn't know whether to leave or stay there. ③I asked Professor Xu how to learn English well. ④The question was where to get the medicine needed. 以上例句中疑问词＋不定式部分，均可转换为相应的从句形式。
如：①When we shall leave…③…how I could learn… 经常在这种结构中使用的动词有：consider,decide,discover,explain,find out,forget,hear,know,lea rn,observe,understand,wonder等。
动词不定式的语法功能 一、作宾语 1) 动词+ 不定式 afford aim appear agree arrange ask be decide bother care choose come dare demand desire determine expect elect endeavor hope fail happen help hesitate learn long mean manage offer ought plan prepare pretend promise refuse seem tend wait wish undertake 举例： The driver failed to see the other car in time. 司机没能及时看见另一辆车。
I happen to know the answer to your question. 我碰巧知道你那道问题的答案。
2）动词+不定式 ；动词+宾语+不定式 ask, beg, choose, expect , hate, help intend like, love, need prefer, prepare, promise, want, wish… I like to keep everything tidy. 我喜欢每件东西都保持整洁。
I like you to keep everything tidy. 我喜欢你年使每件东西都保持整洁。
I want to speak to Tom. 我想和汤姆谈话。
I want you to speak to Tom. 我想让你和汤姆谈话。
3） 动词+疑问词+ to decide, know, consider forget, learn, remember, show, understand, see, wonder, hear, find out, explain, tell Please show us how to do that. 请演示给我们如何去做。
There are so many kinds of tape-recorders on sale that I can't make up my mind which to buy.有这么多的录音机，我都拿不定主意买哪一种。
注意:疑问词带不定式在句中作成分时，谓语动词用单数。
The question is how to put it into practice. 问题是怎样把它付诸实施。
4)以下动词后，只能跟不定式作宾语。
如：agree,ask,aim,arrange,choose,decide,demand,expect,fail ,help,hope,lean,long,manage,offer,plan,prepare, pretend,promise,refuse,wish 等，这些词大部分可接th at引导的从句。
如： I decided to ask for my money back. I decided that I would ask for my money back. When our visit to the farm was over,we expected to startback on foot. When our visit to the farm was over, we expected that wewould start back on foot. 5)当复合宾语中的宾语是不定式时，先用形式宾语it代替不定式，把不定式置于补语之后，即：主语＋动 词＋it＋补语＋to do句式。
如： We think it quite important for us to learn a foreignlanguage well. He feels it his duty to help the poor. 二、作补语 1) 动词+宾语+不定式(to do) advise allow appoint believe cause challenge command compel consider declare drive enable encourage find forbid force guess hire imagine impel induce inform instruct invite judge know like order permit persuade remind report request require select send state suppose tell think train trust understand urge warn 例句： a. Father will not allow us to play on the street. 父亲不让我们在街上玩耍。
b. We believe him to be guilty. 我们相信他是有罪的。
Find 的特殊用法： Find 后可用分词做宾补，或先加形式宾语，再加形容词，最后加带to 的动词不定式。
find后也可带一个从句。
此类动词还有get，have。
I found him lying on the ground. I found it important to learn. I found that to learn English is important. 3) to be +形容词 Seem, appear, be said, be supposed, be believed, be thought, be known, be reported, hope, wish, desire, want, plan, expect, mean… The book is believed to be uninteresting. 人们认为这本书没什么意思。
4) there be+不定式 believe, expect, intend, like, love, mean, prefer, want, wish, undrstand We didn't expect there to be so many people there.我们没料到会有那么多人在哪里。
有些动词需用as 短语做补语，如regard, think believe, take, consider. We regard Tom as our best teacher. 我们认为汤姆是我们最好的老师。
Mary took him as her father . 玛丽把他当作自己的父亲。
三、作主语 动词不定式作主语时，句子的谓语动词常用单数，其位置有以下两种： (1)把不定式置于句首。
如： To get there by bike will take us half an hour. (2)用it作形式主语，把真正的主语不定式置于句后，常用于下列句式中。
如： ①It＋be＋名词＋to do It's our duty to take good care of the old. ②It takes sb+some time+to do How long did it take you to finish the work? ③It＋be＋形容词＋for sb＋to do It is difficult for us to finish writing the compositionin a quarter of an hour. ④It＋be＋形容词＋of sb＋to do It is stupid of you to write down everything the teachersays. ⑤It seems(appears)＋形容词＋to do It seemed impossible to save money. 在句型③中，常用表示客观情况的形容词，如：difficult,easy,hard,important,impossible,necessary 等；在句型④中，常用careless,clever,good,foolish,honest,kind,lazy,nice,right,silly,stupid,wise等 表示赞扬或批评的词。
在不定式前的sb，可看作其逻辑主语。
这一句式有时相当于Sb is＋形容词＋to do句式 ，如：It'skind of you to help me with my English.=You are kind to helpme with my English. (3)举例 1） It's easy (for me) to do that.我做这事太容易了 easy, difficult, hard, important, possible, impossible, comfortable, necessary, better; the first, the next, the last, the best, too much, too little, not enough It's so nice to hear your voice. 听到你的声音真高兴。
It's necessary for you to lock the car when you do not use it. 当你不用车的时候，锁车是有必要的。
2) It's very kind of you to help us. 他帮助我们，他真好。
Kind, nice, stupid, rude, clever, foolish, thoughtful, thoughtless, brave, considerate(考虑周到的), silly, selfish(自私的) 例句: It was silly of us to believe him. 我们真愚蠢，竟然相信了他。
It seemed selfish of him not to give them anything. 他不给他们任何东西，这显得太自私了。
注意：1) 其他系动词如，look，appear等也可用于此句型 2) 不定式作为句子成分时，动词用单数形式。
3) 当不定式作主语的句子中又有一个不定式作表语时，不能用It is… to…的句型 (对)To see is to believe. 百闻不如一见。
(错)It is to believe to see. 四、作表语 不定式作表语表示具体动作或将来动作；动名词作表语表示抽象的一般行为。
①To be kind to the enemy is to be cruel to the people. ②My chief purpose is to point out the difficulties ofthe matter. ③What I would suggest is to put off the meeting. 当主语和表语都是不定式时，其含义一是条件，一是结果（例①）。
当主语是aim,duty,hope,idea,mista ke,plan,purpose,suggestion等为中心词的名词词组（例②）时，或以what引导的名词性分句（例③），不定 式说明主语的内容。
④Our work is serving the people. ⑤What he likes is taking a walk after supper. ⑥The story told by Mr.Wang is interesting. ④⑤句动名词作表语，与主语部分可以转换，如Serving thepeople is out work,而⑥句中是现在分词作 表语，说明主语的性质、状态，现在分词具有形容词的各种特征，另外，动名词作表语还应与进行时态区别开 来。
五、作定语 ⒈不定式作定语 不定式在句中作定语，置于被修饰的名词或代词之后。
如： ①The next train to arrive is from Washington. ②Have you anything to be taken to your sister? ③Do you have anything to say on the question? ④Would you please give me some paper to write on? ⑤My wish to visit France has come true at last. 不定式短语作定语和被修饰词之间表示以下关系： (1)表示将来的动作（例①）。
(2)与被修饰词之间有动宾关系，如是不及物动词，则需加介词（例④）。
(3)与被修饰词之间有动宾关系，同时与句中其它词之间又有逻辑上的主谓关系时，尽管有被动含义，却仍 用主动语态（例③）；如只有动宾关系，而无逻辑上的主谓关系，则需用被动语态（例②）。
(4)不定式作定语时，一般可转换为定语从句，例①to arrive=that will arrive。
六、作状语 1）目的状语 To… only to (仅仅为了), in order to, so as to, so(such)… as to… (如此……以便……) He ran so fast as to catch the first bus. 他飞快地跑以便赶上第一班车。
I come here only to say good-bye to you. 我来仅仅是向你告别。
2）作结果状语，表事先没有预料到的，要放在句子后面。
What have I said to make you angry. He searched the room only to find nothing. 3) 表原因 I'm glad to see you. 典型例题 The chair looks rather hard, but in fact it is very comfortable to ___. A. sit B. sit on C. be seat D. be sat on 答案：B. 如果不定式为不及物动词，其后应有必要的介词。
当动词与介词连用时，常位于形容词+动词不定式结构的末尾。
省to 的动词不定式 1） 情态动词 ( 除ought 外，ought to)： 2） 使役动词 let, have, make： 3） 感官动词 see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后作宾补，省略to。
注意：在被动语态中则to 不能省掉。
I saw him dance. =He was seen to dance. The boss made them work the whole night. =They were made to work the whole night. 4） would rather，had better： 5） Why… \\\/ why not…： 6） help 可带to，也可不带to, help sb (to) do sth： 7） but和except：but前是动词do时，后面出现的动词用不带to的动词不定式。
8） 由and, or和than连接的两个不定式，第二个to 可以省去： 9） 通常在discover, imagine, suppose, think, understand等词后，可以省去to be： He is supposed (to be) nice. 他应该是个好人。
举例： He wants to move to France and marry the girl. He wants to do nothing but go out. 比较： He wants to do nothing but go out. He wants to believe anything but to take the medicine. 典型例题 1) ---- I usually go there by train. ---- Why not ___ by boat for a change? A. to try going B. trying to go C. to try and go D. try going 答案：D. why not 后面接不带to 的不定式，因此选D。
2） Paul doesn't have to be made ___. He always works hard. A. learn B. to learn C. learned D. learning 答案：B. make后接不带to 的动词不定式，当其用于被动时，to 不可省略。
动词不定式的否定式 Tell him not to shut the window… She pretended not to see me when I passed by. 我走过的时候，她假装没看见。
典型例题 1）Tell him ___ the window. A. to shut not B. not to shut C. to not shut D. not shut 答案：B。
tell sb to do sth 的否定形式为tell sb not to do sth. 2) She pretended ___ me when I passed by. A. not to see B. not seeing C. to not see D. having not seen 答案：A。
pretend 后应接不定式。
其否定形式为pretend not to do sth.。
3）Mrs. Smith warned her daughter ___ after drinking. A. never to drive B. to never driver C. never driving D. never drive 答案：A。
warn sb to do sth. 的否定形式为warn sb not to do sth. 此处用的是否定词never. 4) The boy wanted to ride his bicycle in the street，but his mother told him ____. A. not to B. not to do C. not do it D. do not to 答案：A。
not to 为not to do it 的省略形式。
可以只用to这个词，而不必重复整个不定式词组。
及物动词do后应有名词、代词等，否则不对，因此B，D不对。
5) The patient was warned ___ oily food after the operation. A. to eat no B. eating not C. not to eat D. not eating 答案：C。
warn一词要求后用不定式，此处为不定式的被动，否定形式为be warned not to do。
不定式的特殊句型 1、不定式的特殊句型so as to 1） 表示目的；它的否定式是so as not to do。
Tom kept quiet about the accident so as not to lose his job. 汤姆对事故保持沉默是为了不丢掉他的工作。
Go in quietly so as not to wake the baby. 轻点进去，别惊醒了婴儿。
2) so kind as to ---劳驾 Would you be so kind as to tell me the time? 劳驾，现在几点了。
2、 Why not +动词原形表达向某人提出建议 为什么不……? 干吗不……? 例如： Why not take a holiday? 干吗不去度假? 3、It's for sb.和 It's of sb. 1）for sb. 常用于表示事物的特征特点，表示客观形式的形容词，如easy, hard, difficult, interesting, impossible等： It's very hard for him to study two languages. 对他来说学两门外语是很难的。
2）of sb的句型一般用表示人物的性格，品德，表示主观感情或态度的形容词，如good, kind, nice, clever, foolish, right。
It's very nice of you to help me. 你来帮助我，你真是太好了。
for 与of 的辨别方法： 用介词后面的代词作主语，用介词前边的形容词作表语，造个句子。
如果道理上通顺用of，不通则用for。
如： You are nice. (通顺，所以应用of)。
He is hard. (人是困难的，不通，因此应用for。
) 4、不定式的特殊句型too…to… 1）too…to 太…以至于… He is too excited to speak. 他太激动了，说不出话来。
---- Can I help you ? 需要我帮忙吗? ---- Well, I'm afraid the box is too heavy for you to carry it, but thank you all the same. 不用了。
这箱子太重，恐怕你搬不动。
谢谢您。
2) 如在too前有否定词，则整个句子用否定词表达肯定， too 后那个词表达一种委婉含义，意 为不太。
It's never too late to mend. (谚语) 改过不嫌晚。
3) 当too 前面有only, all, but时，意思是：非常… 等于very。
I'm only too pleased to be able to help you. 我非常高兴能帮助你。
He was but too eager to get home. 他非常想回家。
动词不定式的to与介词的to区别to 有两种用法： 一为不定式+动词原形； 一为介词+名词\\\/动名词, to 在下面的用法中是第二种，即to+ 名词\\\/动名词： admit to承认，confess to承认，be accustomed to 习惯于，be used to 习惯于， stick to 坚持， turn to开始，着手于， devote oneself to 献身于， be devoted to 致力于， look forward to 盼望，pay attention to 注意 介词but,except,besides+to do(do) 在这种句型中，如介词前有动词do，后面应接不带to的不定式；如无do，则接to不定式，即带do不带to， 带to不带do。
如： The enemy soldiers had no choice but to give in. On Sunday afternoon I had nothing to do but watch TV. 动词不定式与动名词区别与联系 1） 动名词与不定式的区别： 动名词表达的是： 状态，性质，心境，抽象，经常性，已发生的 不定式表达的是： 目的，结果，原因，具体，一次性，将发生的 2） 接不定式或动名词，意义相同。
3)在下列情况下，一般要用不定式： ①hate,like,love前有would(should)时，如：I'd like to have a cup of coffee. ②当谓语动词begin,continue,start等是进行式时，如：Thestudents are starting to work on the di fficult maths problem. ③begin,continue,start与know,understand等状态动词连用时，如：I soon began to understand what was happening. ⒋advise,allow,encourage,forbid,permit等动词后接动名词作宾语，或带不定式作宾语补足语。
如： Our teachers don't permit our swimming in the lake. Our teachers don't permit us to swim in the lake. 4） 部分动词后接不定式或动名词时，意义差别较大，应根据句子语境选择使用。
①forget,remember,regret后接不定式，表示现在或未来的动作，接动名词表示动作已经发生。
如： Don't forget fo post the letter for me. Have you forgotten meeting her in Beijing Airport? Remember to close the windows before you leave. I remember writing him a letter a year ago. We regret to tell you that all of you are not invited toattend the meeting. They regretted ordering these books from abroad. 动名词与不定式语义不同的有11 组： 1 stop to do stop doing 2 forget to do forget doing 3 remember to do remember doing 4 regret to do regret doing 5 cease to do cease doing 6 try to do try doing 7 go on to do go on doing 8 afraid to do afraid doing 9 interested to do interested doing 10 mean to do mean doing 11 begin\\\/ start to do begin\\\/ start doing
