there be非谓语形式可在句中作主语、宾语、状语和定语

1.作动词宾语时，通常用there to be结构，而不用there being。能这样用的及物动词为：expect，like，mean，intend，want，prefer，hate等，如： We don't want there to be any comrades lagging behind.我们不希望有任何同志掉队。 They hate there to be long queues everywhere..他们不愿意处处都要排长队。 We have no objection to there being a meeting here．我们并不反对在这里开会。

be used to do被用来做……

’t help doing情不自禁做……

can’t help to do不能帮助做…… 2.做宾补时的比较 　 不定式可以表示一次性、具体性行为，以及将来意义的行为。现在分词可以表示当时正在发生的进行意义的行为，亦可表示-个持续时间的延续性的行为动作。过去分词可以表示完成意义的行为或状态，及物动词的过去分词亦有被动意义，不及物动词的过去分词仍是主动意义。 　When I came in, I saw her dancing happily. 　I often hear her sing songs in English in her room. 　They had the lights burning all night long. 　I saw Li Ping pass by and enter the next room just now. 　The mother will have the doctor examine her son again. 　Tomorrow I'll have my hair cut. 　When I got home I found the window broken and the thief gone away already. 　When they returned to their hometown, after an absence of twenty years, they found everything changed. 3.做表语时的比较 　 不定式和动名词做表语解释主语内容，且可以和主语颠倒，意思仍然通顺，回答what的问题。它们有时存在经常性和一次性行为的区别，分词做表语表明主语的性质、特征和状态，不能和主语颠倒，可以回答how的问题。 　Her job is cleaning offices.(What is her job?) (=Cleaning offices is her job.) 　Our job today is to clean the office.(=To clean the office is our job today.) 　The news is very exciting.(How is the news?) 　They are very tired after a long walk. 　The door is locked now. 　The children are well dressed these days. 4.做定语时的比较 　 不定式做定语与先行词有动宾、主谓和解释先行词内容等关系。在时态上常是将来意义，现在分词做定语是现在时或进行时态意义；过去分词做定语则是完成时态意义。此外，不定式做定语时只能后置，不可前置，而单个分词做定语可前置，分词短语做定语则须后置。动名词做定语，须前置，且要重读，它表明先行词的用途。而分词做定语表明先行词的性质、特征和状态。 　a swimming boy=a boy who is swimming 　　a swimming pool=a pool for swimming 　the boiling water=the water that is boiling 　drinking water=water for drinking 　Today I have a letter to write.　Please find a man to help us. 　It is a good chance to practice your spoken English.练习你的口语 　I like reading books written by Lu Xun. 　The woman standing over there is our English teacher.站在那边的 　The house to be built (=which will be built/which is to be built) next year will be our new library. 　The house being built (=which is being built) now will be our new library. 　The house built (=which was built) last year is our new library now. 5.做状语时的比较 　　 不定式和分词做状语各有不同分工。动词不定式多做目的、结果和原因状语，且多放在句末；分词

　 可以表示时间、原因、条件、让步、方式状语，多置于句首，做伴随状语，多放在后面。分词用于go doing结构中作目的状语。

①目的状语：通常有不定式表示，由于不定式的客观性和将来性特征。不定式前还可加上in order，so as来加强说话的口气。但so as to通常不用于句首。 The Smiths have gone to London to spend their holidays. I came here (in order/so as) to hear the report. In order to(不用so as to) see better, we took front seats.

②时间状语：分词作时间状语相当于时间状语从句。现在分词作时间状语一般位于句首，表示的动作和谓语动词的动作同时发生，有时现在分词前可以加上时间连词。如果分词动作发生在谓语动词之前，用现在分词的完成体形式。过去分词作时间状语与谓语动词构成同时性和被动意义。分词前有时加上时间连词。 Arriving (=When he arrived) at the bus stop, he found his sister there. Waiting (=When I was waiting) to see the doctor, I met with a friend of mine. Having (=When we have) made full preparations, we are ready for an examination. Having (=When he had) finished his homework, he went to bed. After finishing his homework, he went to bed. Seen (=When the town is seen) from the hill, the town looks more beautiful. Locked (=When he was looked) up in the room, he found himself isolated from the outer world. When asked to make a speech, he said he was glad to do so.当请他作演讲时 Once recovered, he will go all out to do his work.一旦康复

③原因状语：不定式作原因状语往往用于形容词之后,这些形容词通常是happy, sorry, fortunate, angry, glad, ashamed, discouraged, delighted, frightened, shocked等。分词作原因状语相当于原因状语从句。一般位于句首。 　I am sorry to hear that you are not well. 　I'm very sorry to have kept you waiting so long.让你久等了 　We are greatly delighted to have a native as our guide. 　Being (=Since he was) ill all last year, he lived in a sanatorium. 　There being no enough money, he couldn't buy the dictionary that he wanted. 由于没有钱 　Having (=Since they had) been asked to stay, they couldn't possibly leave right away. 　Moved (=As he was moved) by the heroic deeds of the PLA man, he burst into tears.

④条件状语：通常用分词来表示，相当于条件状语从句。一般位于句首。

Turning (=If you turn) to the left，you will see the post office.

United (=If we are united), we stand; divided (=if we are divided), we fall.

Given (=If he had been given) more time, he would be able to do better.

⑤结果状语从句：不定式作结果状语通常用于so+形容词或副词+as to，such+名词+as to，too…to，enough to和only to等结构。现在分词作结果状语表示谓语动词的结果。 He arrived late to find the train gone. I worked late into the night, only to find I had not finished half of the job. He was so friendly as to be always helpful to his neighbors. His is such a sad story as to arouse out sympathy.

I ran faster than ever, reaching the schoolyard quite out of breath. The man died young, leaving nothing but debt.

⑥让步状语：通常由过去分词来表示，而且前面通常有表示让步意义的though。 Though wounded, the soldier managed to get to the village safely. Though warned of the danger, he still went skating on the thin ice.

⑦伴随或方式状语：分词作伴随状语通常位于句尾，表示谓语动词正在所处主动或被动的状态。 Chinese businessmen, taxi drivers and students talk with them using English. She came running towards us. They walked along the streets, talking and laughing. He went into the house, followed by some children. He continued to walk up and down, lost in thought.

1.做主语和宾语时的比较

一般来说，不定式和动名词成份相同时，表示客观性、一般性行为多用动名词表示，而表示一次性、具体性行为则多用不定式。 Looking after children is her job.照看小孩 To clean the classroom is his job today.打扫教室 I like swimming, but I don't like to swim today because I don't feel well. 注意下列重点内容：

①begin和start本身为进行时，或后面动词为心理变化意义的动词时，须接不定式 When we came in, they were beginning to have supper. After his explanation, I began to understand it / realize that I was wrong.

②有些词后面既可以接不定式．亦可接动名词，但其意义有很大区别，须特别注意 A.remember，forget，regret接动名词，表示完成意义(=having done)，接不定式，表示将来意义 　 Please remember to bring me the book I want next time. 　 I remember seeing her (=having seen her) somewhere before. 　 Don't forget to write to me soon. 　 I never forget visiting (=having visited) them for the first time. 　 I regret missing that good film last week.(后悔) 　 I regret not taking (not having taken) your advice. 　 I regret to say I can't take your advice. (遗憾=be sorry) B.mean：mean to do=want to do打算，想要……

mean doing：意味着，就是 　 I am sorry I didn't mean to hurt your feelings， 　I meant to call on you, but I was so busy. 　 Learning a foreign language doesn't mean just working in class. C.stop：stop to do停下来，要干另一件事(不定式作目的状语)

stop doing停止做(动名词作宾语) After some time, they stopped walking and had a rest. After walking some time, they stopped to have a rest.

D.try：try to do，努力，试图干……

try doing：试着干……

He searched everywhere and tried to find his key. He came to the city from the countryside and tried to find a job. The mother is out and the boy had to try cooking for himself. They tried to succeed and tried doing their experiments again and again.

E.want，need，require接动名词表示被动意义，接不定式就要i用被动式，这时主语与动名词之间为动宾关系。 These young trees require looking after(=to be looked after). The matter needs thinking over(=to be thought over).

F.go on：go on to do继续干和原来不同的另一件事(不定式作目的状语) go on doing继续干原来同一件事(动名词作宾语) After a smoke，he went on telling us that interesting story. After writing the composition he went on to work out his maths problems.

G.动词advise，allow，permit，forbid后面接单宾语时用动名词，接复合宾语时用动词不定式。

Doctors advise giving up smoking to benefit one's health.(放弃)

The doctor advised him to give up smoking so as to improve his health. (放弃) She doesn't allow (permit) smoking in her room.(允许)

H.be considered to have done被认为已经做了……

consider…to be认为是……

consider doing考虑做某事

3.分词在句中充当的成分

①作定语。作定语的分词如果是单个分词，放在所修饰的名词前；如果是分词短语则放在所修饰的名词后面。在用作定语时，分词在意思上接近一个定语从句。

The boring snow made the bored boys go home. (= The snow was boring, so the boys wee bored and went

home.)

China is a developing socialist country.发展中的社会主义国家

The man writing the obituary (讣告) is my friend.

(= The man who is writing the obituary is my friend.)

The broken glass scattered on the ground.破杯

注：现在分词与过去分词都可作定语，但现在分词表达的是正在进行的事情，有主动意义；而过去分词表示的是已完成的事情，有被动意义。

②作表语、宾语补足语。能带分词作宾补的动词常见的有see, hear, keep, find, notice, watch, think, want, smell, observe等。

The story is boring.

I found him reading a novel. 在读小说(现在分词作宾语补足语)

I found him surrounded by a group of children.一群孩子包围着 (过去分词作宾语补足语)

③作状语。分词作状语可以表示时间,原因, 条件,结果,伴随情况。

Having read all the required papers, he answered the questions fluently.(时间)

Being short of money, I decided to apply for the work.(原因)

Seriously injured, Allen was rushed to the hospital.(原因)

If going there by plane, we’ll have to pay twice as much.(条件)

Unless asked to answer questions, the pupils were not supposed to talk in Mrs Smith’s class.(条件)

The farmer used　a new insecticide, thus raising the average yield by 15%.(结果)

He sat in a rocking chair, watching TV.(伴随)

注意：分词的特殊结构

①独立主格

有时分词的逻辑主语与主句主语不一致，这时分词须带上自身的主语，这种结构称为独立主格结构。这

种结构在句中多作伴随状语。亦可用来表示时间、原因、条件等。

That being the case, we’d better make some changes in the plan.

Weather permitting, we will go out. == if weather permits

The teacher having finished the lesson, the students left the classroom.

②“with或without + 名词或代词 + 分词”的复合结构

常用作补充说明或表示伴随情况。例如：He fell asleep with the lamp burning.

③某些固定结构

generally / frankly speaking …,judging from / by …中，分词的逻辑主语与句子的主语不一致，这种结构只限于为数很少的几个动词。

Judging by his dress, he comes from a wealthy family.从他的衣着判断

Frankly speaking, I don't like him at all.坦率地说

④catch+宾语+doing

I caught them stealing my apples．我抓住他们偷我的苹果。

If she catches me reading her diary，she'll be furious.如果她抓住我偷看她的日记，她会愤怒的

注：有些现在分词可以作介词用：如concerning, considering, regarding, respecting等。

Considering his age, he is tall.考虑了他的年龄

I have nothing to say concerning his speech.关于他的演讲

2.动名词在句中充当的成分

①作主语

Asking for help is sometimes necessary. 请求帮助有时是必要的。 Eating too much is not good for your health.吃得太多对你的健康不利。 Teaching offers something besides money and power.

②作补语、表语 Seeing is believing. We call such an act cheating.我们称这样的行为为作弊/欺骗行为。

③作以下及物动词及词组的的宾语

建议冒险去献身：advise, suggest, risk, devote oneself to

忍受期待不停顿：bear/stand(忍受), look forward to, stop

放弃延期悔失去：give up, delay, put off, regret, miss

坚持欣赏(想)要(实)践(完)成：keep (on)/insist on/stick to, enjoy/appreciate, feel like, practice, finish

注意原谅避反对：pay attention to, excuse, escape, avoid, object to

考虑要求不自禁：consider, require, cannot help

允许习惯不介意：forbid; permit, be/get used to/be accustomed to, mind

值得开始想动名：be worth, set about, imagine

The mother did agree to let the boy risk swimming across the river.冒险游过河

His wife doesn't allow smoking inside the room but allows him to smoke outside the room.

他的妻子不允许在室内抽烟，但是允许他在室外抽。

All of them insisted on my staying with them a few days longer.

他们所有的人都坚持要我再跟他们多呆几天时间。

I'm looking forward to hearing from you soon.

Being ill for a few days,she doesn't feel like eating anything.不想吃任何东西

另在want, need, require等动词后，常用动名词的主动形式表示被动的意思(主语与动名词之间存在逻

辑上的动宾关系)。

My hair needs cutting. (= My hair needs to be cut.)

⑤作定语

它与被修饰词之间没有逻辑上的主谓关系，通常只表示用途或与所修饰的名词有关的动作。

The factory built a swimming pool last year.游泳池

Our teacher uses a very good teaching method.教学方法

⑥作同位语

His hobby, making model airplanes, is very interesting.

注意：

①动名词的复合结构

动名词的复合结构由物主代词或名词所有格 + 动名词构成。如果不是在句子开头，这种结构常可以由名词的普通格或人称代词宾格 +动名词构成， 在句中可作主语、宾语等。例如：

Do you mind my closing the door? Do you mind me closing the door?

My closing the door made him angry.

I can’t stand Lao Chang’s talking like that about other comrades.

②动名词的某些固定结构

▲It is + no use, no good(fun,a great pleasure, a waste of time,a bore...)等名词+doing sth.

It is no use crying.哭没有用。

It is no good objecting.反对也没有用。 It is a waste of time trying to explain．设法解释是浪费时间。

▲It is + useless+doing sth．

It is useless speaking.光说没用。

▲There is no + v-ing “…是不可能的”。

There is no knowing how old she is.(= I t is impossible to know how old she is.)

There is no telling where she’s gone.(= It is impossible / difficult to know where she’s gone.)

▲make a point of + doing “认为…是必要的”

Our family make a point of going to church every Sunday.(= Our family make it a rule to go to church every

Sunday.)

▲be on the point of + doing “濒临，将要…”

He was on the point of leaving.

▲on (upon) + doing “一…就…”

On hearing the news, I changed my plans.(= As soon as I heard the news, I changed my plans.)

▲go + doing (大部分指运动和游戏)

He went shopping / hiking / swimming / fishing etc.

▲动名词短语常用在以下结构中

have difficulty (in) + doing sth　　　　

have trouble (in) + doing sth

have fun (in) + doing sth/　　　　　　

have a good time (in) + doing sth/have a hard time (in) + doing sth

▲feel like + 名词“想要”=would like to +原形动词 Do you feel like going to a movie?你想看电影吗? I don't feel like reading tonight．今晚我不想读书。

1.动词不定式在句中充当的成分 ①作主语。

To see once is better than to hear a hundred times.

To make money is not the only purpose of our life.赚钱不是我们生活的唯一目的

在很多情况下，常用it 来充当动词不定式的形式主语。

It is important for us to learn English very well.对我们来说学好英语是非常重要的。

②作动词的宾语，常用在以下动词后：

help，hope，ask，refuse，decide，promise，wish，pretend，expect，arrange，learn，plan，demand，dare，

manage，agree，prepare，fail，determine，offer，choose，desire，elect，long，(happen，seem)

He managed to pass the exam.他成功地通过了考试。

He promised to be here at nine.他答应9点钟到这儿。

I didn’t expect to see you here.我没有料到在这儿见到你。 在某些复合宾语中，用it做形式宾语，而把不定式放到后面去。

He considered it better to leave now.他认为最好现在就离开。

I found it impossible to finish the work on time.我发现准时完成这项工作是不可能的。

③作定语(常置于名词之后)。

由only, last, next 序数词或形容词最高级修饰的名词常用不定式做定语; 不定式还可用作名词

代词的的宾语 (ability, anything, attempt, chance, curiosity, desire, decision, determination, effort, failure,

intention, need, nothing, opportunity, place, plan, promise, reason, right, something)　

She is always the first student to arrive at school.

He is always the last one to leave the office.他总是最后一个离开办公室。

I don’t think he is the best man to do the job.我想他不是做这项工作的最佳人选。

I have no desire to travel. You’ll find something to interest you here. 注：动词不定式to后所接动词若是不及物动词，而不定式与其修饰的动词之间有动宾关系，这个不定式后就应有必要的介词。

I haven’t decided which hotel to stay at.

I found no one to play with.

④作状语

I walked slowly on the ice in order not to fall down.(不至于跌倒)　 (表目的)

They lifted a rock only to drop it on their own feet. (表结果)

He tried only to fail.　(结果没有成功)

She was　 happy to hear the news. (表原因)

不定式常用于修饰下列形容词：

able,afraid,angry, anxious, apt, careful, careless, certain, clever, considerate, delighted, difficult,eager, easy, fit,

frightened , happy, interesting, likely, lucky, quick, ready, reluctant , right, sorry, surprised, sure, thoughtful,

thoughtless, unable, unwilling, wrong etc.

French is difficult to learn. 法语难学。

I’m sorry to interrupt you, but I have to.

⑤作独立副词成分。

To speak frankly, I don’t like your attitude.

⑥与疑问词连用。疑问代词who, what, which和疑问副词when, where, how等后加动词不定式，构成不定式短语，可在句子中作主语、宾语、表语等成分。

When to start has not been decided.什么时候出发还没有定。

The problem is how to get there on time.问题是怎样才能准时到达哪儿。

注意：

①在有些动词后常用疑问词 + 动词不定式的结构。这类动词有：know, ask, tell, show, wonder,consider,

understand, learn, instruct, guess, see, explain, discover, imagine, think, hear 等。

He didn’t know what to do next. I haven’t decided whether to go to Japan.我没有决定是否到日本去。

②不定式的复合结构

由for + 名词或代词 + 动词不定式构成的复合结构在句中可作主语、表语、宾语、状语等。

It is necessary for you to finish the work before Friday.你们有必要在星期五前做完这项工作。

His idea is for us to travel in different cars.他的主意是让我们乘不同的车去旅游。

由of 引出的不定式复合结构，经常与以下形容词连用：brave, careless,,clever,courageous,foolish,good, honest,kind,nice,rash, right,rude, stupid,silly,thoughtful,thoughtless,wrong, wise等。

It’s kind of you to say so.

It’s brave of you to go into the burning building to save the baby!

你真勇敢，冲进着火的大楼里救这个婴儿

③不带to 的动词不定式

▲在有些使役动词及感官动词后可用省略to的动词不定式，如let,make,have, hear,see,feel,smell,

hear,watch等。

The teacher often makes me rewrite the composition.老师常常让我把作文重写。

将该句转换成被动语态：I am often made by the teacher to rewrite the composition. I heard her say that she was fed up.

▲在下列结构后常用不带to的动词不定式：had better, would rather, can not but, cannot help but,

do nothing but等。

I’d better go now, or I’ll miss the train.

They can not but accept his advice.我只好接受他的建议。

▲在except, but 之前有动词do作实义动词，则except, but 后一般接不带to的动词不定式，反之则接

带to的动词不定式。

We have no choice but to wait.我们除了等待别无选择(我们只好等待)。

There is no choice but to go there.

There is nothing to do but to (to 可省略) read a book.

▲在why, why not结构中，紧接其后的动词不定式不带to

Why argue with him?

Why not send those books back?为什么不把那些书送回去？

2.所做成分

注：现在分词、不定式、过去分词都可以作独立成分。

1.基本形式的变化：

不定式：

John said that he had run in order to catch the bus. (一般式的主动态) He hated to be misunderstood by others. (一般式的被动态) He pretended to be listening attentively. (进行式) He intended to have told you that. (完成式主动态) This work of art seemed to have been created several centuries ago. (完成式的被动态) v-ing形式：

注意：不及物动词没有被动式

动名词

I am sure of his coming in time. (一般式主动态) (= I am sure that he will come in time) He is proud of being selected as monitor. (一般式被动态) (= He is proud that he is selected as monitor.) I’m confident of his having passed the exam. (完成式主动态)

(= I am confident that he have passed the exam.)

He complained of having been cheated by others. (完成式被动态)

现在分词

He sat in a chair,reading a novel. (一般式主动态)

Being exhausted by work, he fell asleep quickly. (一般式被动态)

Having finished his homework, he went playing. (完成式主动态)

All this having been settled, he went home. (完成式被动态)

6．(2010年湛江一模)一个静止的质点，在0-5s时间内受到力F的作用，力的方向始终在同一直线上，力F 随时间t的变化图线如图所示。则质点在 C

　 A．第2 S末速度方向改变

　 B．第2 s末加速度为零

　 C．第4 S末运动速度为零

　 D．第4 s末回到原出发点

5．(2010年3月汕头一模)某物体由静止开始做直线运动，物体所受合

力F随时间t的变化图象如图所示，则 B

A. 物体在2~4秒内做匀加速直线运动

B. 物体在4秒末离出发点最远

C. 物体始终向同一方向运动

D. 物体在0~4秒和在4~8秒内的位移相等