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什么是动词不定式
我看前面答主的那些回答也是一知半解的。根本不能回答题主想要知道的。还在那里轴着。其实没有任何意义,是帮助不到题主的。
要了解动词不定式首先要了解动词,因为它是在动词这一大问题下面的一个小问题。
就好像我们要了解狮子为何是狮子,就要先了解猫科动物的由来!知道了这些,我们才知道,猫科动物是怎样演化成狮子的。
回到问题
动词就是我们中国人说话句子里的,坐,走,跑,跳,这些动作词。动词在英语里分两种,一种是谓语动词,一种是非谓语动词(!也叫动词不定式!),英语中最简单的一句话是主语、谓语、宾语三个结构组成的主.谓.宾结构,即我 I (主语),想want/想念Miss(谓语-动词),你you(宾)。即 I WANT YOU(此时这个句子里只有一个动词want)
以上英文一句话里出现一个动词
那么当我们用英文说一句话的时候里面出现两个动词时候。
即 I want hug you,这时就要注意了,注意什么呢,注意把第二个出现的动词变成动词不定式。如下。
我 I(主语),
想 Want(第一个动词-谓语-是动词本身,也叫动词原型。)
拥抱hug(第二个动词-非谓语,因为第二个出现所以要在前面加to变成动词不定式即to hug)
你you(宾语),
所以就是 I want to hug(第二个动词在前面+to变成to hug,也就是动词不定式) you.
不要纠结为什么第二个出现的动词要加to哈,这个是规矩,要问第一个定这个规矩的人,不过那个人早就go die了,所以没答案的哈,你只需要记住这个公式就行了,万年不变的铁律哈。
初中英语动词不定式用法归纳
关于初中英语语法之动词不定式的形式的用法介绍
初中英语语法大全:动词不定式的形式
对于英语的学习中,关于动词不定式的形式知识点的内容,我们做下面的讲解学习哦。
动词不定式的形式
1.作主语。 如:
To learn English is very important.
但实际上不定式作主语常用 it来作形式主语,而将不定式移至谓语动词后作真正的主语。
如上句可表达为:
It's very important to learn English.
2.作表语。 如:
My idea is to ring him up at once.
3.作宾语。 如:
I have decided to go to Binjiang Primary School.
4.作宾语补足语。
a. ask, want, teach, tell, know , would like, allow等动词后面接动词不定式作宾语补足语。
如: The policemen asked him to get off the bus.
b. hear, see, look at, feel, watch, notice, listen to等动词后接不带to的动词不定式作宾语补足语。
如: We often see Miss Li clean the classroom.
c. let, make, have这些使役动词后接不带to的动词不定式作宾语补足语。但在被动语态中这些不带to的都须带上to。
如: In those days the bosses often made the workers work day and night.
d.动词help接动词不定式作宾语补足语,可带to也可不带to。
如: Can you help me (to) carry the heavy bag?
5.作定语。
a.与被修饰词有动宾关系。如:I have something important to tell you.但如果不定式动词为不及物动词,后面的介词千万不要省略。
如: Maybe they have three rooms to live in.
b.与被修饰词有主谓关系。
如: Mr Liang is always the first to come and the last to leave.
c.与被修饰之间只有修饰关系。
如: I have no time to play cards.
6.作状语,表示目的、原因、方法、方向、结果等。
如: I'll go to meet my friend at the railway station.
7.不定式复合结构"for sb. to do sth" 作主语时,常用"It is +adj+ for
of sb. to do sth"的句式。形容词good, bad, polite, unkind, kind, ice, clever,
right, wrong, careful等用"It is +adj +of sb. to do sth."
其他形容词用 for。
如:
It's dangerous for you to ride so fast.
It's very kind of you to help me.
8.动词不定式与疑问句who, what, which, when, how, where, whether等连用。
如: I don't know when to start.
He didn't tell me where to go.
但上面结构相当于一个从句,故上述句子也可表达为:
I don't know when we'll start.
He didn't tell me where he would go.
注意:
a.有些动词或动词短语不能带不定式,只能接动词的-ing形式。
如: enjoy, finish, keep, mind, miss(错过),be busy, go on, keep on, be worth, practise等。
如: The peasants are busy picking apples.
Would you mind my opening the door?
b.有些动词后可接不定式,也可接动词的-ing形式,但意思不同。
如: Lu Jian forgot to post the letter.(该寄但还没做)
Lu Jian forgot posting the letter.(已经寄过信了)
They stopped to sing a song.(停止在做的工作而去做另一件工作)
They stopped singing.(停止正在做的工作)
;动词不定式的用法总结及例句
动词不定式(to do)是英语课的一个重点,也是很多考试中要考查的一个项目。你知道动词不定式的用法有哪些吗?接下来,我给大家准备了动词不定式的用法 总结 ,欢迎大家参考与借鉴。
▼▼目录▼▼
动词不定式的用法总结
名词的所有格形式
英语动词不定式短语
● 动词不定式的用法总结
动词不定式属于非谓语动词的一种形式,很多同学经常把它和谓语动词混在一起,掌握起来有困难。下面我们对动词不定式的用法做简单归纳,帮助同学们记忆:
一、动词不定式在 句子 中不能充当谓语,没有人称和数的变化。
二、动词不定式是由“to+动词原形”构成(有时可以不带to)。动词不定式的否定形式是“not+动词不定式”(not不与助动词连用)。
三、动词不定式 短语 具有名词、形容词和副词等的功能,可在句中用做多种句子成分。
1、主语:常置于句末,而用it代替其做形式主语。例:
To go in for sports helps you
stay fit.(book4,L28)
It helps you stay fit to go in for sports. It is dangerous to swim in the deep sea on your own.
注:此句式中不定式逻辑上的主语可由for或of引出,逻辑主语由of引出时,表语的形容词为kind,nice,good,polite,clever,foolish,right,wrong等表示评价的形容词。
例:It's right of him to refuse the invitation1.(him为逻辑主语)
2、表语:Our duty is to protect the enviroment.
3、动词宾语:此种情况可按固定搭配或句式去记。
例:would you like to see my photos?
Kevin planned to visit his uncle.(book4,L11)
和plan用法一样的词还有:start,want,agree,hope,begin,decide等。
I found it very difficult to get a job.(it为形式宾语)
4、宾语补足语:
(1)在多数复合宾语及物动词后要带to。
例:I asked a friend to read it to me.(book4,L2)
(2)在表示感觉、致使等意义的动词(see,watch,hear,feel,notice,observe,make,let,have,help等)后不带to。
例:They heard him sing a pop song in the meeting room.
5、定语:动词不定式做定语放在所修饰的名词的后面。
例:Vinny is the first disabled2 person to sail3 around the world.(book4,L1)
6、形容词补足语:在表示心理、感情、评价等的形容词后,对其进行补充说明。
例:Weareverygladtomeetyouagain.
7、状语:表示目的、原因、程度等。
例:They brought in photos of their families for me to look at.(book4,L2)
8、“疑问词+不定式”用法:不定式前可带what,who,which,where,when,how等疑问词,这种不定式短语在句中多用做宾语。
例:He didn't tell me where to go.
9、在初中阶段还涉及到“不定式被动语态一般式(tobe+过去分词)”。
例:There are twenty more trees to be planted.
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● 扩展: 名词的所有格形式
A. 's用在单数名词以及不以s结尾的复数名词之后:
a man's job 男人的活儿
the people's choice 人民的选择
men's work 男人的工作
the crew's quarters 船员的舱房
a woman's intuition 女子的直觉
the horse's mouth 马嘴
the butcher's(shop) 肉店
the bull's horns 公牛角
the child's voice 孩子的声音
women's clothes 妇女的服装
the children's room 孩子们的房间
Russia's exports 俄国的出口
B .省字撇(')用于以s结尾的复数名词之后:
a girls' school 一所女子学校
the students' hostel1 学生招待所
the eagles' nest 鹰巢
the Smiths' car 史密斯家的小汽车
C. 以s结尾的古希腊或罗马的姓名之后通常也只加省字撇('):
Pythagoras' Theorem 毕达哥拉斯定理
Archimedes' Law 阿基米德原理
Sophocles' plays 索福克勒斯的戏剧
D. 以s结尾的其他姓氏之后可以用's或单独使用省字撇('):
Mr Jones's/Mr Jones' house琼斯先生的房子
Yeats's/Yeats'poems叶芝的诗
E. 复合名词是在最后一个词之后加's以构成其所有格形式:
my brother-in-law's guitar我姐 /妹夫的吉他
由几个词组成的名字可同样处理:
Henry the Eighth's wives亨利八世的妻子们
the Prince of Wales's helicopter威尔士王储的直升机
's也可用在首字母缩写词之后:
the PM's(Prime Minister's) secretary首相的秘书
the MP's(Member of Parliament's) briefcase议员的公事包
the VIP's(Very Important Person's) escort要人的护送(摩托)队
注意:使用所有格形式时,“被拥有的”人或物之前的定冠词就不用了:
the daughter of the politician=the politician's daughter这位政治家的女儿
the intervention of America=America's intervention美国的干预
the plays of Shakespeare=Shakespeare's plays莎士比亚的戏剧
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● 英语动词不定式短语
1.It's time to do sth./It's time for sth 该做某事的时候了
eg:Now it's time to sing alone. 现在是独自唱下去的时候了。
2.can't wait to do sth. 迫不及待要做某事
eg:We can't wait to have a try. 我们等不及想要常试一下了。
3.Ask/tell sb. (not ) to do sth. 要求/告诉某人(不)做某事
eg:Did I not tell you to help robbery/homicide? 难道我没有告诉你要去协助调查抢劫谋杀案么?
4.Allow sb. to do sth. 允许某人做某事
eg:As long as I am alive, I'll not allow you to do that.
只要我活着就不允许你做那件事。
5.Be supposed to do sth. 应该做某事
eg:I did everything right, everything I was supposed to do.
我做的一切都是正确的,我做了一切我该做的事。
6.Would like/want (sb.) to do sth. 想要做某事
eg:I would like some coffee. 我想要一点儿咖啡。
7.Have sth/nothing to do 与……有关/与……无关
eg:This thing has nothing to do with you. 这事和你一点关系也没有。
8.find it +adj. to do sth. 发觉做某事……
eg:I find it difficult to live with him. 我发现跟他生活在一起是很困难的。
9.Prefer to do sth. rather than do sth. 宁愿做某事,而不愿做某事
eg:I prefer to do hard work rather than do nothing at home.
我宁愿干重活而不愿在家无所事事。
10.It's +adj. for sb. to do sth. 做某事对某人来说……
eg:It's difficult for women to get jobs in high position.
对妇女来说得到一个高职位的工作是很难的。
11.It's better/best to do sth. 最好做某事
eg:Generally, it's better to apply filler materials in thin layers.
一般来说,最好适用于薄层填充材料。
12.It takes sb/sth. to do sth. 某人做某事用了一些时间
eg:It takes some time to cultivate a new friendship. 建立一段新的友谊需要一段时间。
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动词不定式的用法总结相关 文章 :
★ 不定式作宾语用法总结
★ 初中英语不定式知识点归纳
★ 不定式作状语的用法总结
★ 动词不定式是如何否定的
★ 不定式的特殊句型too…to…的用法
★ 英语动词知识讲解:6类动词的用法
★ 非谓语动词用法总结
★ 英语语法知识点总结
★ 英语基础语法知识点总结:动词的时态
★ 英语动词的语法归纳
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[编辑本段]动词不定式的简介
动词不定式是一种非限定性动词,非限定动词是指那些在句中不能单独充当谓语的动词,分为不定式,动名词,现在分词和过去分词,由to+动词原形构成,但在有些情况下to可以省略。在句中不能单独作谓语。它具有动词的性质,本身可以带宾语和状语。动词不定式在句中可以作除了谓语之外的任何成分,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。
[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
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.
[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,lean,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。
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.
[编辑本段]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/us 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
1 forget doing/to do
forget to do 忘记要去做某事。 (未
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