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动词
1） 表示动作中状态的词叫做动词。
2） 根据其在句中的功能，动词可分为四类，分别是：实义动词（Notional Verb）、系动词（Link Verb）、助动词（Auxiliary Verb）、情态动词（Modal Verb）。
说明：有些情况下，有些动词是兼类词，例如：
We are having a meeting. 我们正在开会。 （having是实义动词。）
He has gone to New York. 他已去纽约。
（has是助动词。）
3） 动词根据其后是否带有宾语，可分为两类，分别是：及物动词（Transitive Verb）、不及物动词（Intransitive Verb），缩写形式分别为vt. 和vi.。
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英语动词是句子的核心。它既决定着句子意思的表达同时又决定着句子的语法结构。难怪有人说，英语是动词和介词的语言。可见研究动词的用法在英语学习中是十分重要的。
(一、) 分清及物不及物:
分清动词的及物不及物是在英语学习中必须解决的首要问题。动词及物与不及物通常有以下几种情况：
a．主要用作及物动词。及物动词后面必须跟宾语。可以用于："主＋谓＋宾"；"主＋谓＋双宾"；"主＋谓＋宾＋宾补"结构。如：
He reached paris the day before yesterday.
Please hand me the book over there.
They asked me to go fishing with them.
类似的还有：buy, catch, invent, found, like, observe, offer, prevent, promise, raise, find, forget, receive, regard, see, say, seat, supply, select, suppose, show, make, take, tell....
b．主要用作不及物的动词。不及物动词后面不跟宾语。只能用与："主＋谓"结构。
This is the room where I once lived.
类似的还有：agree, go, work, listen, look, come, die, belong, fall, exist, rise, arrive, sit, sail, hurry, fail, succeed....
c．既可以用作及物又可以用作不及物的动词，其意义不变。如begin 都是作"开始"讲。everybody , our game begins. let us begin our game. 类似的还有：start, answer, sing, close, consider, insist, read, learn, prepare, pay, hurt, improve....
d．既可以用作及物又可以用作不及物的动词，其意义完全不同。
这类动词作不及物动词是一个意义；而作及物动词时却是另一个意义。如lift作不及物动词时是指烟雾的"消散"。we saw the mountain when the clouds lifted. 作及物动词时是"升高；举起"。
He lifted his glass and drank.
类似的还有：beat vi.跳动 vt. 敲、打; grow vi.生长 vt. 种植
play vi.玩耍 vt. 打（牌、球）,演奏 smell vi.发出（气味） vt. 嗅
ring vi.（电话、铃）响vt.打电话 speak vi.讲话 vt. 说（语言）
hang vi. 悬挂 vt. 绞死 operate vi.动手术 vt. 操作
(二、) 辨别表动作与表结果的动词
表动作的动词强调动作的发生，不涉及该动词的结果。如：
He looked at the picture. He saw a picture .
前一句中的动词强调"看"这一动作；而后一句中的动词表示"看到"这一结果。类似的还有：tear at; tear, look for; find, try to do sth.; manage to do sth., prepare for; be prepared for, advise; persuade 等。
(三、) 记住瞬间动词
英语中不少动词所表示的动作在瞬间就可以完成．如：
He arrived in paris yesterday.
而另一些动词所表示的动作则可以延续．如：
They worked until 12 o'clock last night.
特别是在现在完成时态的句子中，瞬间动词的完成时态不能跟表示一段时间的时间状语连用。瞬间动词有：arrive, borrow, buy, close, fall, finish, go, join, kill, hit, leave, lend, die, marry, open, reach, return, start, stop, recognize....等。
(四、) 掌握好表状态的连系动词与表变化的连系动词
英语中的连系动词主要分为两大类：
a．表状态的连系动词。如：he is a good worker. 除了be 而外，还有：stand(位于),lie(位于),stay, have, consist of, belong to, exist, weigh, own....等。
b．另一类连系动词表示动作或变化，是由行为动词转化而来的。一般在这些连系动词后跟形容词作表语如：his hair grows grey. 这类连系动词还有: turn, become, taste, smell, sound, look, feel, get...等。
(五、) 注意词义相近，用法不同的动词
a．表主观与客观的动词
I received his invitation last night, but i didn't want to accept it.
该句中，动词receive, accept 都表示"接受"但前者表示客观地接收到什么东西；后者表示 "I" 的主观意愿。类似用法的动词还有：listen to; hear, look at; see, must; have to等。
b．表直接与间接的动词
He heard that the scientist would come to our school.
He heard of the news that the scientist would come to our school.
前句中hear的表示直接听说的，而后一句中hear of 的表示间接听说的。类似用法的动词还有：know; know of, speak; speak of, talk; talk of等。
(六、) 重视多字动词的用法
所谓多字动词是指动词与某些副词、介词构成的动词词组。一般有四种形式：
a．"动词+介词"结构。 该结构中的动词是不及物动词，当和一些介词搭配后，则把它看成一个整体，即把它看成一个及物动词。如：
We never thought of such success when we first started.
类似用法的还有：agree to, ask for, attention to, break into, call upon, deal with, laugh at, dream of, listen to, look at, operate on, talk about, rely on, refer to...
b．"动词+副词"结构。该结构中的动词是及物动词的，该结构及物；是不及物的，则不及物。如：
We put off the sports meet.
After he grew up, he went to london to work for a company.
类似用法的还有: bring about, bring up, call up, carry out, find out, give up, hand in, help out, look up, make out, pass on, point out, put away, put down, put away, put down, put off, put on, ring up, set up, take up, think over, turn down, use up, work out..., wake up, shut up, come about, break out, carry on, come up, fall over, get away, get back, look out, go up, go out, stay up....
在这类结构中，必须注意有的多字动词即及物又可不及物。有的甚至汉语意义也完全不相同。如：
He looked up and saw his teacher in front of him. (vi. 抬起头看)
He looked up the word in the dictionary. (vt. 查找)
类似的有break down vi.（车等）坏了 vt. 分解，分为 ;
go over vi. 走过去 vt. 复习，仔细查看等。
c．"动词+副词+介词"结构。如：
We should do away with that sort of thing.
类似的有：give in to, catch up with, look down upon, make up for, put up with....
d．"动词+名词+介词"结构。该结构是最多，最常见的多字动词。如：
We will take care of them.
类似的有：catch sight of, keep an eye on, make use of, make a fool of, make fun of, make room for, make sure of, knock out of, have a word with, pay attention to, put an end to, set fire to, take advantage of, take hold of, take note of, take notice of, take part in, take pride in, take possession of, play a trick on, play a part in....
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说明：同一动词有时可用作及物动词，有时可用作不及物动词。例如：
She can dance and sing.
她能唱歌又能跳舞。（sing在此用作不及物动词。）
She can sing many English songs.
她能唱好多首英文歌曲。（sing用作及物动词。）
4） 根据是否受主语的人称和数的限制，可分两类，分别是：限定动词（Finite Verb）、非限定动词（Non-finite Verb）例如：
She sings very well.
她唱得很好。（sing受主语she的限制，故用第三人称单数形式sings。）
She wants to learn English well.
她想学好英语。（to learn不受主语she的限制，没有词形变化，是非限定动词。
说明：英语中共有三种非限定动词，分别是：动词不定式（Infinitive）、动名词（Gerund）、分词（Participle）。
5) 根据动词的组成形式，可分为三类，分别是：单字词（One-Word Verb）、短语动词（Phrasal Verb）、动词短语（Verbal Phrase）例如：
The English language contains many phrasal verbs and verbal phrases.
英语里有许多短语动词和动词短语。（contains是单字动词。）
Students should learn to look up new words in dictionaries.
学生们学会查字典。（look up是短语动词。）
The young ought to take care of the old.
年轻人应照料老人。（take care of是动词短语。）
6）动词有五种形态，分别是：原形（Original Form）、第三人称单数形式（Singular From in Third Personal）、过去式（Past Form）、过去分词（Past Participle）、现在分词（Present Participle）。
7) 及物动词不需要介词
在英语错误中，"及物动词＋介词＋宾语"（transitive verb+preposition+object），是常见的一种。所谓及物动词，就是谓语动词（predicative verb），不必通过介词引荐宾语。相反的，不及物动词（intransitive verb）是不带宾语的。有许多动词，虽然性质是及物的，但不一定要有宾语，如下列的①a和②a便是这种情形：
①a. We study every day.
b. Do you study English every day.
②a. Please write clearly next time.
b. Can you write your composition now?
如果本质上就是不及物动词，就不会有宾语；若要宾语，就要借介词之助，一起连用才行，如③b和④b;③a和④a是错的；
*③a. The children are listening the music.
b. The children are listening to the music.
*④a. She is laughing the crippled man.
b. She is laughing at the crippled man.
反之，及物动词不必靠介词，就可以带宾语，如上述的①b和②b ，又如⑤和 ⑥：
⑤ John is giving a book to me.
⑥ Who will answer this question?
如果无意中把介词加上，就错了，如：
*⑦ Who will answer to this question?
下列这句从房地产广告中看到的句子，也犯了同样的错：
"We have many buyers awaiting for available units here."
"Awaiting"是个及物动词，后面的介词"for"是多余的，要去掉；不然把"awaiting"改为"waiting for"也行。
许多人习惯上喜欢把介词加到及物动词后面，然后才带出宾语。最常见的是"emphasize/stress on/upon"和"discuss about"，如：
⑧ Singaporeans seem to have emphasized on material gains.
⑨ In our education system, we stress upon examination results.
⑩ World leaders spent a lot of time discussing about worsening economic problems.
显然的，这三句里的介词"on/upon"和"about"是多余的，不必要的。
下面是些类似的错误：
● The young must obey to their elders.
● Do not approach to that odd-looking man.
● The audience attacked on the rude speaker.
● Nothing can escape from his parents' eyes.
● Do you hope to serve for your nation?
● When did Susan marry with Paul?
介词"to, on, from, for, with"都要去掉才对。
为什么会有这些错误呢？主因是分不清楚及物动词和不及物动词的性质。其次，就是对同一个动词及其名词的句型有些混淆。解决之道有二。第一，要把"及物动词＋宾语"和"不及物动词＋介词＋宾语"划分清楚，如：
I did not answer him./ I did not reply to him.
He reached Londan yesterday./ He arrived in London yesterday.
第二，把及物动词转化为名词，然后加上适当的介词和宾语，如：
Don't approach such a person.
Is oral practice a good approach to language teaching?
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1 系动词
系动词亦称联系动词（Link Verb），作为系动词，它本身有词义，但不能单独用作谓语，后边必须跟表语（亦称补语），构成系表结构说明主语的状况、性质、特征等情况。
说明：
有些系动词又是实义动词，该动词表达实义时，有词义，可单独作谓语，例如：
He fell ill yesterday.
他昨天病了。（fell是系动词，后跟补足语，说明主语情况。）
He fell off the ladder.
他从梯子上摔下来。fell是实义动词，单独作谓语。
1）状态系动词
用来表示主语状态，只有be一词，例如：
He is a teacher. 他是一名教师。（is与补足语一起说明主语的身份。）
2）持续系动词
用来表示主语继续或保持一种状况或态度，主要有keep, rest, remain, stay, lie, stand, 例如：
He always kept silent at meeting. 他开会时总保持沉默。
This matter rests a mystery. 此事仍是一个谜。
3）表像系动词
用来表示"看起来像"这一概念，主要有seem, appear, look, 例如：
He looks tired. 他看起来很累。
He seems (to be) very sad. 他看起来很伤心。
4）感官系动词
感官系动词主要有feel, smell, sound, taste, 例如：
This kind of cloth feels very soft.
这种布手感很软。
This flower smells very sweet.
这朵花闻起来很香。
5）变化系动词
这些系动词表示主语变成什么样，变化系动词主要有become, grow, turn, fall, get, go, come, run.
例如：
He became mad after that. 自那之后，他疯了。
She grew rich within a short time. 她没多长时间就富了。
6）终止系动词
表示主语已终止动作，主要有prove, trun out, 表达"证实"，"变成"之意，例如：
The rumor proved false. 这谣言证实有假。
The search proved difficult. 搜查证实很难。
His plan turned out a success. 他的计划终于成功了。（turn out表终止性结果）
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怎样区分半连系动词
连系动词多有自己的意思，但不能独立作谓语，必须与表语（名词、形容词，或与之相当的词类、短语、从句）一起构成合成谓语。最常用的连系动词为be（是）动词，即完全连系动词，另外还有look，turn，feel，get，become，sound，smell，stand，go，remain等半连系动词。无论是完全连系动词还是半连系动词、后面都有表语。由于半连系动词是由实意动词变来的，那如何分辨该动词为实意动词还是半连系动词呢？这对初学英语的中学生来说会感到有点困难，我在教学中尝试用比较法和替换法，使学生较能接受。
1．比较法
比较下列各组句子
(1) A． Please look at the blackboard．请看黑板。
B． He looked a perfect fool．他看上去是个十足的傻瓜。
(2) A．Turn to Page 16．翻到 16页。
B．He turned traitor to his country．他背叛了祖国。
A．He felt it his duty to help others．
他认为帮助别人是自己的责任。
B．I felt very hungry after a long walk．
走了一段长路，我感到很饿。
A.Get me some ink．给我一些墨水。
B．Our motherland is getting stronger and stronger．
我们国家变得越来越强大了。
A．Such words do not become a scholar．
那样的话不像出自学者之口。
B．Some of the land became covered with water．
一些田地覆盖着水。
A．This black key on the piano won't sound．
这钢琴上的黑键按下去不响。
B． The story sounds interesting．
这故事听起来很有趣。
A.I am sure I smell gas．我肯定闻到了煤气味。
B．The flowers smell sweet．花朵散发芳香。
A．He was too weak to stand．他太虚弱，不能站立。
B．Holding the note in his hand，he stood there dumbfounded．他拿着钞票，站在那里，目瞪口呆。
A．He goes to school early every morning.
他每天早上很早上学。
B． They went mad．他们发狂了。
A． I remained 3 weeks in Paris．
我在巴黎逗留了三周。
B．He never remained satisfied with his success．
他从不满足于自己的成绩。
2．替换法
分析以上10组句子我们不难看出B组斜体动词均为连系动词，因为如果我们把动词 be（是）的适当形式替代斜体动词，句子能够成立，后面的成分即是表语。
（1）He was a perfect fool．
（2）He was a traitor to his country.
（3）I was very hungry after a long walk．
（4）Our motherland is stronger and stronger．
（5）Some of the land was covered with water．
（6）The story is interesting．
（7）The flowers are sweet．
（8）Holding the note in his hand，he was there dumbfounded．
（9）They were mad．
（10）He was never satisfied with his success．
反之，如果把 be（是）动词的适当形式替代 A组斜体动词，句子则不能成立，无法解释，A组动词均不为连系动词：
*（l）Please be at the blackboard．
*（2）Be to Pagel6．
*（3）He was if his duty to help others．
*（4）Be me some ink．
*（5）Such words are not a scholar．
*（6）The black key on the piano won't be．
*（7）I am sure I am gas．
*（8）He was too weak to be．
*（9）He is to school early every morning．
*（10）I was 3 weeks in Paris．
另外半连系动词是由实意动词变来的。所以把含有半连系动词的句子改为疑问句时，一定要用助动词。
例如：1． Do they look tired？
2．Has she got ready？
3．Did it become much more expensive to travel abroad？
不论完全连系动词或半连系动词，它们都有时态的变化，但有些半连系动词从形式上看像是现在进行时，实际上并不表示动作正在进行。而是表示"渐渐"的意思或表示一种感情色彩。
（1）It's getting warmer and warmer．
天渐渐暖和起来了。
（2）Are you feeling better now？
你现在好点了吗？
因为半连系动词本属于不及物动词，所以没有被动语态。
如不能说：* Good medicine is tasted bitter to the mouth．应说：
Good medicine tastes bitter to the mouth．良药苦口。
半连系动词的教学还是个较困难的问题，但在初学阶段用先比较，再替换的方法，还是能使学生掌握哪些实意动词可充当半连系动词，收到事半功倍的效果。
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2 什么是助动词
1）协助主要动词构成谓语动词词组的词叫助动词（Auxiliary Verb）。被协助的动词称作主要动词（Main Verb）。
助动词自身没有词义，不可单独使用，例如：
He doesn't like English. 他不喜欢英语。
（doesn't是助动词，无词义；like是主要动词，有词义)
2） 助动词协助主要动词完成以下功用，可以用来：
a. 表示时态，例如：
He is singing. 他在唱歌。
He has got married. 他已结婚。
b. 表示语态，例如：
He was sent to England. 他被派往英国。
c. 构成疑问句，例如：
Do you like college life? 你喜欢大学生活吗？
Did you study English before you came here? 你来这儿之前学过英语吗？
d. 与否定副词not合用，构成否定句，例如：
I don't like him. 我不喜欢他。
e. 加强语气，例如：
Do come to the party tomorrow evening. 明天晚上一定来参加晚会。
He did know that. 他的确知道那件事。
3） 最常用的助动词有：be, have, do, shall, will, should, would
3 助动词be的用法
1） be +现在分词，构成进行时态，例如：
They are having a meeting. 他们正在开会。
English is becoming more and more important. 英语现在越来越重要。
2) be + 过去分词，构成被动语态，例如：
The window was broken by Tom.. 窗户是汤姆打碎的。
English is taught throughout the world. 世界各地都教英语。
3） be + 动词不定式，可表示下列内容：
a. 表示最近、未来的计划或安排，例如：
He is to go to New York next week.. 他下周要去纽约。
We are to teach the freshpersons. 我们要教新生。
说明： 这种用法也可以说成是一种将来时态表达法。
b. 表示命令，例如：
You are to explain this. 对此你要做出解释。
He is to come to the office this afternoon. 要他今天下午来办公室。
c. 征求意见，例如：
How am I to answer him? 我该怎样答复他？
Who is to go there? 谁该去那儿呢？
d. 表示相约、商定，例如：
We are to meet at the school gate at seven tomorrow morning. 我们明天早晨7点在校门口集合。
4 助动词have的用法
1）have +过去分词，构成完成时态，例如：
He has left for London. 他已去了伦敦。
By the end of last month, they had finished half of their work.
上月未为止，他们已经完成工作的一半。
2）have + been +现在分词，构成完成进行时，例如：
I have been studying English for ten years.
我一直在学英语，已达十年之久。
3）have+been +过去分词，构成完成式被动语态，例如：
English has been taught in China for many years.
中国教英语已经多年。
5 助动词do 的用法
1） 构成一般疑问句，例如：
Do you want to pass the CET? 你想通过大学英语测试吗？
Did you study German? 你们学过德语吗？
2） do + not 构成否定句，例如：
I do not want to be criticized. 我不想挨批评。
He doesn't like to study. 他不想学习。
In the past, many students did not know the importance of English. 过去，好多学生不知道英语的重要性。
3) 构成否定祈使句，例如：
Don't go there. 不要去那里。
Don't be so absent-minded. 不要这么心不在焉。
说明： 构成否定祈使句只用do，不用did和does。
4） 放在动词原形前，加强该动词的语气，例如：
Do come to my birthday party. 一定来参加我的生日宴会。
I did go there. 我确实去那儿了。
I do miss you. 我确实想你。
5） 用于倒装句，例如：
Never did I hear of such a thing. 我从未听说过这样的事情。
Only when we begin our college life do we realize the importance of English.
只有在开始大学生活时我们才认识到英语的重要性。
说明： 引导此类倒装句的副词有never, seldom, rarely, little, only, so, well等。
6） 用作代动词，例如：
---- Do you like Beijing? --你喜欢北京吗？
---- Yes, I do. --是的，喜欢。（do用作代动词，代替like Beijing.）
He knows how to drive a car, doesn't he?
他知道如何开车，对吧？
6 助动词shall和will的用法
shall和will作为助动词可以与动词原形一起构成一般将来时，例如：
I shall study harder at English. 我将更加努力地学习英语。
He will go to Shanghai. 他要去上海。
说明：
在过去的语法中，语法学家说shall用于第一人称，will 只用于第二、第三人称。现在，尤其是在口语中，will常用于第一人称，但shall只用于第一人称，如用于第二、第三人称，就失去助动词的意义，已变为情态动词，试比较:
He shall come. 他必须来。（shall有命令的意味。）
He will come. 他要来。（will只与动词原形构成一般将来时。）
7 助动词should,would的用法
1）should无词义，只是shall的过去形式，与动词原形构成过去将来时，只用于第一人称，例如：
I telephoned him yesterday to ask what I should do next week.
我昨天给他打电话，问他我下周干什么。
比较：
"What shall I do next week?" I asked.
"我下周干什么？"我问道。（可以说，shall变成间接引语时，变成了should。）
2） would也无词义，是will的过去形式，与动词原形构成过去将来时，用于第二、第三人称，例如：
He said he would come. 他说他要来。
比较：
"I will go," he said. 他说："我要去那儿。"
变成间接引语，就成了：
He said he would come.
原来的will变成would，go变成了come.。
8 短语动词
动词加小品构成的起动词作用的短语叫短语动词（Phrasal Verb）。例如：
Turn off the radio. 把收音机关上。（turn off是短语动词）
短语动词的构成基本有下列几种：
1） 动词+副词，如：black out；
2） 动词+介词，如：look into；
3） 动词+副词+介词，如：look forward to。构成短语动词的副词和介词都统称为小品词（Particle）。
9 非谓语动词
在句子中充当除谓语以外的句子成分的动词形式叫做非谓语动词。非谓语动词分为三种形式:不定式，动名词，和分词(分词包括现在分词和过去分词)。
1）不定式
时态\语态 主动 被动
一般式 to do to be done
完成式 to have done to have been done
2）动名词
时态\语态 主动 被动
一般式 doing being done
完成式 having done having been done
3）分词
时态\语态 主动 被动
一般式 doing being done
完成式 having done having been done
否定形式： not +不定式， not + 动名词， not + 现在分词
动名词
1 动名词作主语、宾语和表语
1）作主语
Fighting broke out between the South and the North.
南方与北方开战了。
2）作宾语
a. 动词后加动名词doing作宾语 V. + doing sth
admit 承认 appreciate 感激,赞赏 avoid 避免
complete 完成 consider 认为 delay 耽误 deny 否认 detest 讨厌 endure 忍受 enjoy 喜欢 escape 逃脱 prevent阻止
fancy 想象 finish 完成 imagine 想象 mind 介意 miss 想念 postpone 推迟 practise 训练 recall 回忆 resent 讨厌 resist 抵抗 resume 继续 risk 冒险
suggest 建议 face 面对 include 包括 stand 忍受 understand 理解 forgive 宽恕 keep 继续
举例：
(1) Would you mind turning down your radio a little, please?
(2) The squirrel was lucky that it just missed being caught.
b. 词组后接doing
admit to prefer…to be used to lead to devote oneself to object to stick to busy look forward to(to为介词）
no good, no use, It's worth…, as well as,
can't help, It's no use /good be tired of
be fond of be capable of be afraid of
be proud of think of / about hold off
put off keep on insist on count on / upon
set about be successful in good at take up
give up burst out prevent … from…
3）作表语
Her job is washing，cleaning and taking care of the children.
2 worth 的用法
worth，worthy，worth-while都为adj. 意为"值得"。
1. worth： be worth + n. 当名词为金钱时，表示"…… 值得……"
be worth doing sth. "……某事值得被做"
The question is not worth discussing again and again.
2. worthy：be worthy of +n. 当名词为抽象名词时表示"……值得……"
be worthy to be done "某事值得被做"
The question is not worthy to be discussed againand again.
3. worth-while： be worth-while to do sth "值得做某事"
worth while： It is worth while doing sth
It is worth while sb to do sth.
典型例题
It is not ____ to discuss the question again and again.
A.worth B.worthy C.worth-while D.worth while
答案C. 由worth的用法可知，此句只适合词组be worth-while to do sth.。因此选C。
动词不定式
1 不定式作宾语
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。
2 不定式作补语
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 do sth. 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。
注意 ： 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。
3 不定式主语
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.
4 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。)
5 不定式作表语
不定式可放在be动词后面，形成表语。例如：
My work is to clean the room every day.
His dream is to be a doctor.
6 不定式作定语
不定式做定语通常要放在被修饰的词后。例如：
I have a lot of work to do.
So he made some candles to give light.
7 不定式作状语
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。
8 用作介词的to
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
9 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。
10 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。
11 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。
12 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。
13 不定式的特殊句型Why not
"Why not +动词原形"表达向某人提出建议，翻译为："为什么不……?" "干吗不……?"
例如：
Why not take a holiday?
干吗不去度假?
14 不定式的时态和语态
时态\语态 主动 被动
一般式 to do to be done
进行式 to be doing
完成式 to have done to have been done
完成进行式 to have been doing
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.
15 动名词与不定式
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） 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
动名词与不定式区别实例：
1 stop doing/to do
stop to do 停止，中断做某事后去做另一件事。
stop doing 停止做某事。
They stop to smoke a cigarette. 他们停下来，抽了根烟。
I must stop smoking. 我必须戒烟了。
典型例题
She reached the top of the hill and stopped ___ on a big rock by the side of the path.
A. to have rested B. resting C. to rest D. rest
答案：C。由题意可知，她到了山顶，停下来在一个路边的大石头上休息。因此，应选择"stop to do sth. 停下来去做另一件事"。而不仅仅是爬山动作的终止，所以stop doing sth.不正确。
2 forget doing/to do
forget to do 忘记要去做某事。 (未做)
forget doing 忘记做过某事。 (已做)
The light in the office is stil on. He forgot to turn it off.
办公室的灯还在亮着，它忘记关了。(没有做关灯的动作)
He forgot turning the light off.
他忘记他已经关了灯了。 ( 已做过关灯的动作)
Don't forget to come tomorrow.
别忘了明天来。 (to come动作未做)
典型例题
---- The light in the office is still on.
---- Oh，I forgot___.
A. turning it off B. turn it off C. to turn it off D. having turned it off
答案：C。由the light is still on 可知灯亮着，即关灯的动作没有发生，因此用forget to do sth.
而forget doing sth表示灯已经关上了，而自己忘记了这一事实。此处不符合题意。
3 remember doing/to do
remember to do 记得去做某事 (未做)
remember doing 记得做过某事 (已做)
Remember to go to the post office after school.
记着放学后去趟邮局。
Don't you remember seeing the man before?
你不记得以前见过那个人吗?
4 regret doing/to do
regret to do 对要做的事遗憾。 (未做)
regret doing 对做过的事遗憾、后悔。 (已做)
I regret to have to do this, but I have no choice.
我很遗憾必须这样去做，我实在没有办法。
I don't regret telling her what I thought.
我不为告诉她我的想法而后悔。
典型例题
---You were brave enough to raise objections at the meeting.
---Well, now I regret ___ that.
A. to do B. to be doing C. to have done D. having done
答案：D。regret having done sth. 对已发生的事感到遗憾。regret to do sth. 对将要做的事感到遗憾。本题为对已说的话感到后悔，因此选D。
5 cease doing/to do
cease to do 长时间，甚至永远停做某事。
cease doing 短时停止做某事，以后还会接着做。
That department has ceased to exist forever.
那个部门已不复存在。
The girls ceased chatting for a moment when their teacher passed by.
姑娘们在老师走过时，停了会聊天。
6 try doing/to do
try to do 努力，企图做某事。
try doing 试验，试着做某事。
You must try to be more careful.
你可要多加小心。
I tried gardening but didn't succeed.
我试着种果木花卉，但未成功。
特殊词精讲
1 stop doing/to do
stop to do 停止，中断做某事后去做另一件事。
stop doing 停止做某事。
They stop to smoke a cigarette. 他们停下来，抽了根烟。
I must stop smoking.. 我必须戒烟了。
典型例题
She reached the top of the hill and stopped ___ on a big rock by the side of the path.
A. to have rested B. resting C. to rest D. rest
答案：C。由题意可知，她到了山顶，停下来在一个路边的大石头上休息。因此，应选择"stop to do sth. 停下来去做另一件事"。而不仅仅是爬山动作的终止，所以stop doing sth.不正确。
7 go on doing/to do
go on to do 做了一件事后，接着做另一件事。
go on doing 继续做原来做的事。
After he had finished his maths，he went on to do his physics.
做完数学后，他接着去做物理。
Go on doing the other exercise after you have finished this one.
作完这个练习后，接着做其他的练习
8 be afraid doing/to do
be afraid to do 不敢，胆怯去做某事，是主观上的原因不去做，意为"怕"；
be afraid of doing 担心出现doing的状况、结果。 doing 是客观上造成的，意为"生怕，恐怕"。
She was afraid to step further in grass because she was afraid of being bitten by a snake.
她生怕被蛇咬着，而不敢在草丛中再走一步。
She was afraid to wake her husband.
她不敢去叫醒她丈夫。
She was afraid of waking her husband.
她生怕吵醒她丈夫。
9 be interested doing/to do
interested to do 对做某事感兴趣，想了解某事。
interested in doing 对某种想法感兴趣，doing 通常为想法。
I shall be interested to know what happens.
我很想知道发生了什么事。 (想了解)
I'm interested in working in Switzerland. Do you have any idea about that?
我对在瑞士工作感兴趣。你想过这事吗? (一种想法)
10 mean to doing/to do
mean to do 打算、想
mean doing 意味着
I mean to go, but my father would not allow me to.
我想去，但是我父亲不肯让我去。
To raise wage means increasing purchasing power.
赠加工资意味着增加购买力。
11 begin(start) doing/to do
begin / start to do sth
begin / start doing sth.
1) 谈及一项长期活动或开始一种习惯时，使用doing.
How old were you when you first started playing the piano?
你几岁时开始弹钢琴？
2) begin, start用进行时时，后面动词用不定式to do
I was beginning to get angry。
我开始生起气来。
3) 在attempt, intend, begin, start 后接know, understand, realize这类动词时，常用不定式to do。
I begin to understand the truth。
我开始明白真相。
4) 物作主语时
It began to melt.
12 感官动词 + doing/to do
感官动词 see, watch, observe, notice, look at, hear, listen to, smell, taste, feel + do 表示动作的完整性，真实性；+doing 表示动作的连续性，进行性
I saw him work in the garden yesterday.
昨天我看见他在花园里干活了。(强调"我看见了"这个事实)
I saw him working in the garden yesterday.（强调"我见他正干活"这个动作）
昨天我见他正在花园里干活。
典型例题
1）They knew her very well. They had seen her ___ up from childhood.
A. grow B. grew C. was growing D. to grow
答案：A。因题意为，他们看着她长大，因此强调的是成长的过程，而非正在长的动作，因此用see sb do sth 的句型。
2）The missing boy was last seen ___ near the river.
A. playing B. to be playing C. play D. to play
答案A. 本题强调其动作，正在河边玩，应此用see sb. doing sth句型。
一、动词不定式与-ING分词的区别
1. 作宾语时，-ING分词表示抽象的、一般性或习惯性的和连续性的动作，而不定式则表示某次具体动作，特别是将来的动作
I like playing football. I would like to play football this afternoon.
1) The school cannot tolerate on exams.
［A］ cheating ［B］ to cheat ［C］ be cheated ［D］ being cheated
2) News of success keeps in.
［A］ pouring ［B］ to pour ［C］ poured ［D］ to be pouring
3) Long ［A］ before the dawn ［B］ of recorded ［C］ history, humans celebrated to harvest ［D］ their crops.
2. 作定语时，-ING表示正在进行的动作，用-ING的完成时表示动作的完成；不定式表示未来发生
4) We were overjoyed at the news of China another man-made satellite.
［A］ having launched ［B］ to have launched ［C］ to launch ［D］ launched
5) The applicants interviewing ［A］ are required to ［B］ bring all the necessary papers ［C］ two days later ［D］ .
6) Sorghum(高梁) leaves ［A］ occasionally contain ［B］ enough hydrocyanic acid killing ［C］ livestock(牲畜) ［D］ .
3. 当谓语动词是进行时的时候，用不定式而不用-ING分词作宾语
It's beginning to snow you. It starts raining.
I'm considering how to go(where to go, what to do). I considered emplying Mr.Wang but
decided that Mr.Chen was more suited
to the job.
4. 在remember,forget等词后，如果跟-ING分词，表示-ING分词的动作发生在主要谓语之前；如果跟不定式则表示不定式的动作发生在主要谓语动作之后
I remember telling her that last night. ("告
诉"发生在"记得"之前) He remembered to tell her that when she
came back. ("记得"发生在"告诉"之前)
I'm sorry I forgot to give you the message. (主
语动词表示的动作"忘记"发生在不定式表
示的动作"给带口信"之前) Why! I have such a bad memory. I forgot
giving the message last night. (-ING分词
表示的动作"给带口信"发生在谓语动词表
示的动作"忘记"之前)
5. stop, go on和leave off之后跟接动词不定式和-ING分词所表达的意义有所不同
They stopped (talking) to work. ［停下(其他动作)来工作］
They stopped working. ［停下工作(来干其他动作)］
Workers went on discussing the problem. ［工人继续讨论这一问题］
Workers went on to discuss the problem.［工人们停下来其他事，继续讨论这一问题］
He left off writing.［他停下写作(去干其他事)］
He left off to write.［他停下(其他事)来写作］
6. … used to后跟不定式和-ING分词，后跟不定式有两种情况：一种是used to是固定用法表示"过去经常干……"；另外一种情况是use的被动词态"be used"后跟不定式；后跟-ING分词的情况有一种，那就是当used to中的used是形容词时，to后跟名词或-ING分词
7) When he was in the plastic plant, he together with the workers.
［A］ has worked ［B］ had worked ［C］ had been worked ［D］ used to work
8) You will soon this climate and then the changes in temperature will not affect you.
［A］ get used to
［B］ get to
［C］ get over
［D］ get on with
9) Mr. Anderson used to jogging ［A］ in the crisp morning ［B］ air during ［C］ the winter months ［D］ , but now he has stopped.
7. 一般情况下，for后边跟接there to be,而of后边则跟接there being
10) It is fairly common in Africa for there an ensemble of expert musicians surrounded by others who join in by clapping, singing, or somehow adding to the totality of musical sound.
［A］ to be ［B］ being ［C］ to have been ［D］ having been
8. be＋形容词后面要跟动词不定式作状语，而不用-ING
It is very difficult to manage the company.
二、-ING分词与-ED分词的区别
虽然在语法功能上，-ED分词在句子中所能承担的成分基本与-ING分词相同，但在意义上两者有差别：-ING分词表示主动的意义，而-ED分词则表示被动的意义；-ING分词表示一般性的或正在进行的动作，而-ED分词则表示已经完成和被动的动作。在表现形式上，-ING分词有"一般式"和"完成式"与"主动式"和"被动式"之分；而-ED分词只有一种形式。下边我们分析-ING分词与-ED分词在语法功用上的区别。
1. 作表语时，-ING分词表示主语所具有的特征而-ED分词表示主语所处的状态
The book is quite interesting. I am insteredted in the book very much.
The play is more exciting than any I have
ever seen. That piece of land lay deserted.
2. 作状语时-ING分词表示主语正在进行的另一动作而-ED分词则表示主语发生动作的背景或情况 11) In his movies，W. C. Fields was always at war with the world， .
［A］ battling both people and objects
［B］ both people and objects were battled
［C］ he was battling both people and objects
［D］ both people and objects that were battled
13) Having been served lunch， .
［A］ the problem was discussed by the members of the committee
［B］ the committee members discussed the problem
［C］ it was discussed by the committee members the problem
［D］ a discussion of the problem was made by the members of the committee
12) for her anthropological research，Margaret Mead also was involved with the World Federation for Mental Health.
［A］ She is noted primarily
［B］ Noted primarily
［C］ Primarily is noted
［D］ She primarily noted
14) Considered one of the leading poets in America today， .
［A］ a number of books and plays have also been written by Sonia Sanchez
［B］ Sonia Sanchez has also written a number of books and plays
［C］ a number of Sonia Sanchez's books and plays have been written
［D］ there have been a number of books and plays written by Sonia Sanchez
3. ①作定语时，-ING分词表示正在进行的动作，而-ED分词表示动作发生在谓语动词之前；②-ING分词表示它所修饰的词经常或当时的状态，而-ED分词则没有时间性；③-ING分词表示主动，而-ED分词表示被动
15) The boiled ［A］ point of any liquid ［B］ is determined ［C］ by the pressure ［D］ of the surrounding gases.
16) High-grade ［A］ written ［B］ paper is frequently ［C］ obtained ［D］ from cotton rags.
17) Scientists ［A］ still cannot find ［B］ any convinced ［C］ link between intelligence ［D］ and the quantity or quality of brain cells.
4. 但少数几个动词的-ED分词，有两种形式而且在意义上有差别，如：bear的-ED分词有born和borne之分，前者只用于"出生"的意义，而后者用于"负担"，"负荷"，"承担"和"传送"之意
I was born in 1966.
His borne responsibility to the whole workers of the factory is really great.
再如：hang的-ED分词也有两种，一是hung,另一形式是hanged, 前者表示"悬挂"，后者表示"吊死，绞死"。strike的-ED分词也有两种：struck和striken, 前者有"打击""冲击""感动"等义，而striken只用作形容词，表示"受折磨"之意。
来自及物动词的-ED分词所表示的是被动意义；来自不及物动词的-ED分词则可表示主动和完成的意义：fallen leaves (落叶)，a full-blown rose (盛开的玫瑰), escaped prinsoners(逃犯), the exploded bomb, her deceased husband, the retired workers, the vanished jewels, the newly arrived visitors, the returned students, the risen sun.
三、例题解析
1) A为正确答案。(一般性的动作。)
2) A为正确答案。(连续的动作。)
3) D错。 改为harvesting(抽象的动作)。
4) A为正确答案。(已完成的动作。)
5) C错。 改为to be interviewed(将要发生的动作)。
6) C错。改为to kill(不定或未来动作)。
7) D为正确答案。(过去经常或总是干……)
8) A为正确答案。(习惯于……used是形容词)
9) A错。改为jog。(表示过去经常或总是干……)
10) A为正确答案。
11) A为正确答案。
12) B为正确答案。本句是由-ED分词"noted"引导的-ED结构，在句中说明主句谓语的背景。
13) B为正确答案。
14) B为正确答案。-ED分词"considered"的逻辑主语应为人，除B外的其他选项都无法和空白前-ED结构在逻辑主语上一致。
15) A错。改为boiling。-ED分词含有完成和被动的意思，-ING分词则表示主动、进行，也可用作前置定语表示性状、用途。如："boiling water(water which is boiling.)"意思是"开水"，意即"正在开着的水"，而"boiled water(water which has been boiled.)"虽也可译为"开水"，但表示"已开过了的水(现在可能凉了)。"本句A处应改为boiling，"boiling point"意思是"沸点"。
16) B错。改用"writing"，"writing paper"意为"写字的纸，信纸"，-ING分词"writing"表用途。与此类似的还有"swimming pool"(游泳池) ，"sleeping car"(卧铺) 。"written"含有完成和被动意味，不合上下文。
17) C错。改为"convincing"。"令人信服的联系"应为"convincing link"，"convincing"含有主动的意味，即"联系"(link)本身具有这种性质，而"convinced"则含有完成或被动的含义， 修饰有生命的名词 。试比较：a surprising man (使人惊讶的人) ，a surprised man (被惊吓了的人)
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