动词不定式用中考
中考英语试题中的“动词不定式”考点透视
动词不定式是一种非谓语形式，其基本形式：to＋动词原形，有时将to省略。下面结合中考英语试题，对其考点进行分析，希望对同学们全面掌握其用法有所帮助。
一、考查动词不定式的否定式
1．The teacher told Xiao Ming ________ late for school again．（2001福州）
A．not to be B．not be C．don't be D．not to
2．Mrs Black asked the man ________ the queue．（2001广西）
A．not to jump B．to not jump C．didn't jump D．not jump
3．You'd better ________ when your mouth is full of food．（2001广州）
A．don't speak B．not to speak C．not speak D．not speaking
分析：动词不定式的否定形式是在不定式符号to前加not，但要注意：had better后接不带to的不定式，其否定式为：had better not do sth．。
二、考查动词不定式作主语
4．It's good ________ others when they are in trouble．（2001四川）
A．helping B．to help C．help D．helps
分析：动词不定式作主语，常放在句中，而用it作为形式主语，置于句首。
三、考查动词不定式作宾语
5．All of us found ________ difficult to work out the maths problem．（2001黑龙江）A．it B．that C．which D．what
6．I thought ________ interesting to work in the fields．（2001连云港）
A．that B．it C．this D．／
7．She needs ________ warm clothes because it's cold today．（2001广东）
A．wear B．wearing C．to wear D．to be worn
分析：要求用动词不定式作宾语的动词很多。但要注意：（1）动词不定式作think，make，find，feel等的宾语时，常用结构为：think ／make ／find ／feel＋it＋宾补（adj．／n．）＋to do sth；（2）need作实义动词时，后面可跟不定式作宾语。
四、考查动词不定式作宾语补足语
8．He asked me ________ to his birthday party．（2001长沙）
A．to go B．go C．goes D．went
9．I ________ him to help you．（2001乌鲁木齐）
A．wish B．wishes C．hope C．hopes
分析：要求带to的动词不定式作宾补的动词有：tell，ask，want，would like，invite，allow，encourage，teach，wish，advise等。
10．—Is Wei Fang good at singing？
—Yes，she is．We often hear her ________ in the next room．（2001苏州）
A．to sing B．sings C．sing D．sang
11．Many boys and girls are made ________ what they're not ________．（2001青岛）
A．to do；interested B．to do；interested in
C．do；interested in D．doing；interested
12．What makes you ________ I am an American？（2001扬州）
A．think B．to think
C．thinking D．thought
分析：使役动词make，let，have和感官动词see，watch，notice，hear，feel等要求用不带to的不定式作宾补。但要注意，变被动语态时，要还原to。
13．He didn't help me ________（mend）my bike．（2001湖南）
分析：动词不定式作help的宾补时，可带to，也可不带to。
五、考查动词不定式作后置定语
14．She has no paper ________ ．（2001重庆）
A．to write B．to write with
C．write on D．to write on
15．There's enough bird food ________ for a month．（2001山西）
A．to last B．last
C．lasts D．lasted
分析：动词不定式作后置定语，常用于“have＋某事＋to do”或“enough＋名词＋to do”结构中。
六、考查“疑问词＋不定式”作宾语
16．Could you show us ________ a bike？（2001济南）
A．how to mend B．what to buy
C．where to go D．how many to buy
17．I don't know when we shall leave for Nanjing．（改为简单句）（2001上海）
I don't know when ________ ________ for Nanjing．
分析：know，show，tell，find out，discuss，learn，decide，teach等动词后，可跟“疑问词＋不定式”构成的短语作宾语。注意：“疑问词＋不定式”作宾语时，相当于一个宾语从句。
［Keys：1—6 AACBAB 7—12 CAACBA 13．（to）mend 14—16 DAA 17．to leave］
中考英语动词不定式考点全攻略
中考英语动词不定式考点全攻略 动词不定式历来是中考英语命题的热点之一。它是动词的一种非谓语形式，没有人称和数的变化，不能单独作句子的谓语。其构成形式为"（not）to+动词原形"。 考点攻略一：动词不定式作主语 1）动词不定式直接用在主语位置：To see you is always a pleasure. 2）如果主语较长，则可以用it作形式主语，而将真正的主语(不定式)置于后面。 ①It is +形容词+(of sb.) to do sth. 此处常用careless, clever, foolish, honest, kind, nice, rude, stupid, silly, wrong, wise等形容词，与介词of搭配，这些形容词常表述不定式逻辑主语的属性或性质。 It’s brave of you to jump into the river to save the boy! ②It is +名词或形容词+ (for sb.)to do sth. 此处常用necessary, hard, difficult, easy, important, impossible等形容词，与介词for搭配，表示不定式的动作或行为的性质。 It is our duty to keep our classroom clean. It is important for us to protect the environment. ③It takes sb. some time to do sth. It usually takes us about two and a half hours to travel from Shanghai to Japan. 考点攻略二：动词不定式作宾语 其后常接不定式作宾语的动词有：agree, afford, choose, decide, expect, plan, promise, manage, hope, wish, want, seem, refuse, fail等。 I didn’t expect to see you here. 在某些复合宾语中，动词有find, consider, think, make, feel,常先用it代替不定式，作形式宾语，而把不定式放到后面去。 I find it impossible to finish the task on time. 考点攻略三：动词不定式作宾语补足语 动词不定式作宾补，即“动词+宾语+（not）to do sth.”，接不定式作宾补的常见动词有：advise, allow, ask, cause, expect, beg, encourage, get, help, invite, teach, order, remind, tell, want, wish, warn等。 My parents always tell me not to be late for school. 考点攻略四：动词不定式作表语 不定式作表语一般位于系动词之后，表示具体动作，特别是表示将来的动作；若主语是aim, duty, hope, idea, job, plan, problem, purpose, wish等名词，不定式作表语是对主语起补充说明作用。 It is said that they are to visit China next month. My wish is to become a scientist like Einstein. 考点攻略五：动词不定式作定语（常用于名词之后）。 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， Tom is always the first student to arrive at school. 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词之间有动宾关系时，此不定式后要加相应的介词。 We haven’t decided which hotel to stay at. I need a pen to write with. 考点攻略六：动词不定式作目的状语。如： To keep fit, students are advised to do morning exercises. so as to (不可用于句首使用)，in order to也可以引导目的状语。
英语常见动词不定式词组
常见动词不定式词组、句型用法总结 ★希望做某事hoｐe to do stｈ. ★决定做某事deｃidｅto do sｔｈ. ★同意做某事aｇree tｏｄo sth、 ★需要某人做某事neeｄto ｄo ｓth。 ★使用某物做某事ｕse sth to dｏｓtｈ ★迫不及待做某事ｃan’t wａiｔｔo ｄｏ ★准备做某事ｇet／bｅｒeady ｔｏ do ★尽力/努力做某事ｔｒｙtｏdo sth ★计划做某事ｐｌan ｔo do ｓth。 ★不得不hａve to dｏ ★轮流做某事ｔaｋe oｎｅ’ｓturｎs ｔo do st ｈ。 ★拒绝做某事ｒefｕse to dｏsｔh。 ★告诉某人做某事tell ｓｂ. to do sｔh、
★请某人做某事ask sb、tｏdｏstｈ。 ★期待某人做某事eｘpecｔsb、to dｏｓt ｈ. ★教某人做某事tｅach sb。tｏdo sth ★想要某人做某事want /would lｉke sb、to do stｈ、 ★同意某人做某事agrｅe ｓb. ｔo do ｓｔh。. ★喜欢/想要某人做某事lｉke sb、to do st ｈ。 ★帮助某人做某事helｐsb。tｏdo sth／help sb.do ★It’ｓｏne's ｔurｎto do sｔh、轮到某人做某事 ★It’s ｔime(ｆｏr sb。) to dｏsth。就是某人做某事时候了
★It's +aｄｊ. fｏr/oｆsb. ｔｏdｏsｔh。对于某人来说做某事就是…… ★Iｔtakes sｂ。tiｍｅto ｄo ｓtｈ。某人做某事花了某时间 以下就是不带to得动词不定式(即动词原形)得常见用法 ★leｔsb、ｄo ｓth让某人做某事★maｋe ｄo sth使得某人做某事 ★hｅar do sth do sth听见某人做某 事★sｅｅdo sｔh do ｓｔh瞧见某人做某事 ★why nｏt 或why ｄon’t ｙｏu +动词原形?为什么不…。？(表示建议) ★某人+ｈaｄbeｔter( ｎot)do 某人最好(不)做某事
(完整版)初中英语动词不定式练习题
一. 根据上句意思完成下句，使两句意思相近或相同，每空一词。 1. He was so angry that he couldn’t say anything. He was too angry _______ ______ anything. 2. I don’t know when we will have the meeting. I don’t know when _______ _______ the meeting. 3. He said he would write a letter. He said he would have a letter ______ _______. 4. That you read English in the morning is very important. It is very important _____ you _____ _______ English in the morning. 5. He was so strong that he could lift the stone. （石头） He was strong _____ _____ ______ the stone. 6. His father went to Beijing for his holiday. His father went to Beijing ________ ______ his holiday. 7. They got up early so that they could get there in time. They got up early _____ ______ _______ ______ there in time. 8. His brother decided that he would buy the book. His brother decided _____ _______ the book. 9. He hopes that he can visit the Great Wall. He hopes _____ _______ the Great Wall. 10.I saw him go into the room. He was seen _____ ______ into the room. 11.We made him work five hours a day. He was made _____ ______ five hours a day. 12.Do you want to say anything for yourself? Do you have anything _____ _____ for yourself? 13.We don’t know what we shall do next. We don’t know what ____ _______ next. 14.I’m very sorry on hearing the bad news. I’m very sorry _____ _______ the bad news. 15.He stopped and had a look at me. He stopped _____ ______ a look at me. 16.I helped him with his English. I helped him _____ ______ English. 17.My father promised （许诺）that he would buy me a bike. My father promised ____ ______ me a bike. 18.The box is so heavy that I can’t carry it. The box is too heavy ______ me _______ _______. 19.“Lie down! ”the boy said to his dog. The boy ordered his dog ______ ______ down. 20.“Don’t make any noise ”s he said to me. She told me ______ _______ ________ any noise. 二. 单选： 1. This company was the first ____ portable radios as well as cassette tape recorders in the world. A. producing B. to produce C. having produced D. produced 2. The purpose of new technology is to make life easier ____it more difficult. A .not making B. not make C .not to make D. nor to make 3. Helen had to shout ______above the sound of the music .
初中动词不定式专题讲解及练习(全面)
语法：动词不定式 动词不定动式是一种非谓语动词形式，它没有人称和数的变化，在句子中不能作谓语，但可以作除谓语之外的其它任何句子成分（主语、表语、宾语、宾语补足语、定语和状语）；动词不定式具有名词、形容词和副词的特征，同时还保持动词的某些特点，既可以有自己的宾语和状语，动词不定式和它的宾语和状语构成不定式短语。 一、构成：to do .否定式not to do 二、常见时态：一般时to do 进行时to be doing 完成式to have done 完成进行式to have been doing 三、动词不定式在句子中的成分 1、作句子的主语:现实中常用it作形式主语，而把真正的主语动词不定式（或短语）后 置。 比较下列句子 To lear n from your frie nds is importa nt.=lt is importa nt to lear n from your frie nds . ______ To leave without say ing goodbye is impolite.= It is impolite to leave without saying ________ goodbye. To chat with Miss White is a pleasa nt thi ng.=lt is a pleasa nt thi ng to chat with Miss ______ White. To walk to school takes me ten minu tes.=lt takes me ten minu tes to walk to school. _______ 句型总结 It is + adj. + of sb. to do sb：?i= are +adj. +to do 在以某些表示人的品质、特征等的形容词（如kind、good、nice、wrong、clever、right等）作表语时，不定式之前常加一个引起的短语，说明不定式指的是谁的情况（可以理解为某人的好，坏，聪明，愚蠢，对，错等等）。 It is very kind of you to help me. It ' s not polite of himto speak to old people like that. It is + adj. + for sb. to do …乞aisb+Odj. +to do 女:果要说明不定式表示的动作是谁做的，则在不定式前加一个for引起的短语，即不定式的逻辑主语。 It is n ecessary for us to study hard ___ It is easy for him to speak En glish. 动词不定式作主语练习 1. It's our duty the room every day. A. to clea n B. clea ned C. clea n D. cleans（甘肃省）
初中英语动词不定式十大考点解析(整理)
初中英语动词不定式十大考点解析 动词不定式是动词的一种非谓语形式，没有人称和数的变化，不能单独作句子的谓语。其构成形式为"to+动词原形"，to为动词不定式的符号，本身无意义。 一、动词不定式作主语 动词不定式作主语时，可以直接放在谓语动词前面的主语位置，也可以用先行词it作形式主语，而将真正的主语(不定式)置于后面。常见的句式有：(1)It is +形容词(of sb)to do sth. (2)It is +名词(for sb)to do sth. (3)It takes sb some time to do sth. (4)It is +形容词(for sb)to do sth. 句式(1)中常用nice，kind，clever，good，right，wrong，foolish，careless等形容词，与介词of 搭配，这些形容词常表述不定式逻辑主语的属性或性质; 句式(4)中常用hard，difficult，easy，important等形容词，与介词for搭配，表示不定式表示的动作、行为的性质。 1. It's our duty _________ the room every day. A. to clean B. cleaned C. clean D. cleans(甘肃省) 2. It's hard for us _________ English well. A. learn B. learns C. to learn D. learning(江西省) 3.建造这座立交桥将花费工人们一年多的时间。 It will _________ the workers over a year _________ _________ the flyover.(北京市海淀区) 4. It's very nice _________ you to get me two tickets _________ the World Cup. A. for，of B. of，for C. to，for D. of，to(安徽省) Keys：1. A 2. C 3. take，to，build 4. B 二、动词不定式作宾语 在want，like，agree，hope，wish，learn，begin，start，seem，decide，hate，choose，forget，remember等动词后面，可以接不定式作宾语。如果其后接形容词补足语时，则可以用it 作形式宾语，而把作真正宾语的不定式放到后面。 1. He wants ______ some vegetables. A. buy B. buying C. to buy D. buys (山西省) 2. Don't forget ______ your homework with you when you come to school. A. to bring B. bringing C. to take D. taking (福建省) 3. He found it very difficult ______. A. sleeping B. sleepsC. slept D. to fall asleep (湖南省) Keys：1. C 2. A 3. D
中考动词不定式练习题
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英语动词不定式的用法
英语动词不定式的用法 老高川学校刘金平 英语中的动词不定式在考试中是比较常见的。不定式在句子中可做主语、宾语、表语、定语、状语和宾语补语。以下是动词不定时的用法解析。 1)动词不定式做主语一般表示具体的某次动作。 【例如】 To complete the 30 storied building in one year was quite a difficult task. To do that implies taking responsibility. 当主语较长，谓语较短时，常用it做形式主语，而将不定式放到谓语的后面。 【例如】 It is important for modern young people to master at least two foreign languages. It做形式主语，不定式放在谓语动词之后常用于下列结构中： a) It is+形容词(easy, important, difficult, foolish, inconvenient, unnecessary, right, wrong...)+( for/of sb.)+不定式 【例如】 It is essential to reserve a table in advance of Christmas Eve. It is hard to put my hopessintoswords. It is not easy to catch fish with your hands only. It is important for us young people to learn English and master it.
初中英语动词不定式练习及答案
动词不定式练习：（35份） 一. 根据上句意思完成下句，使两句意思相近或相同，每空一词。 1. He was so angry that he couldn’t say anything. He was too angry _______ ______ anything. 2. I don’t know when we will have the meeting. I don’t know when _______ _______ the meeting. 3. He said he would write a letter. He said he would have a letter ______ _______. 4. That you read English in the morning is very important. It is very important _____ you _____ _______ English in the morning. 5. He was so strong that he could lift the stone. （石头） He was strong _____ _____ ______ the stone. 6. His father went to Beijing for his holiday. His father went to Beijing ________ ______ his holiday. 7. They got up early so that they could get there in time. They got up early _____ ______ _______ ______ there in time. 8. His brother decided that he would buy the book. His brother decided _____ _______ the book. 9. He hopes that he can visit the Great Wall. He hopes _____ _______ the Great Wall. 10.I saw him go into the room. He was seen _____ ______ into the room. 11.We made him work five hours a day. He was made _____ ______ five hours a day. 12.Do you want to say anything for yourself? Do you have anything _____ _____ for yourself? 13.We don’t know what we shall do next. We don’t know what ____ _______ next. 14.I’m very sorry on hearing the bad news. I’m very sorry _____ _______ the bad news. 15.He stopped and had a look at me. He stopped _____ ______ a look at me. 16.I helped him with his English. I helped him _____ ______ English. 17.My father promised （许诺）that he would buy me a bike. My father promised ____ ______ me a bike. 18.The box is so heavy that I can’t carry it. The box is too heavy ______ me _______ _______. 19.“Lie down! ”the boy said to his dog. The boy ordered his dog ______ ______ down. 20.“Don’t make any noise, ”she said to me. She told me ______ _______ ________ any noise. 二. 单选： 1. This company was the first ____ portable radios as well as cassette tape recorders in the world. A. producing B. to produce C. having produced D. produced 2. The purpose of new technology is to make life easier, ____it more difficult. A .not making B. not make C .not to make D. nor to make 3. Helen had to shout ______above the sound of the music . A .making herself hear B. to make herself hear C. making herself heard D .to make herself heard
2019中考英语专题讲练： 动词不定式(含解析)
动词不定式 动词不定式 知识精讲 非谓语动词指的是在句中不能单独作谓语，但保留动词的某些特征（如有自己的宾语或状语等）的动词形式。非谓语包括动词不定式、现在分词、过去分词和动名词。非谓语动词没有人称和数的变化，但要遵循基本的时态语态规则，在句中充当各种成分。 一、动词不定式基本构成 have等）的后面，做宾补时，通常会省略to，如： The boss made me work ten hours a day. =I was made to work ten hours a day by the boss. 这个老板让我一天工作十个小时。 二、动词不定式的语法功能 动词不定式在句子中可充当主语、表语、宾语、宾补、定语和状语（即除谓语之外的各种成分）。 1. 不定式作主语 1). 动词不定式短语作句子主语时，视为单数，谓语动词用第三人称单数，如： To make work more efficient is our goal. 让工作更有效率是我们的目标。
2). 不定式短语作主语时，为了考虑句子的平衡，常用it作形式主语，而将真正的不定式主语放在句子后面，结构为：It+is/ was+adj. (+for sb.)+动词不定式，如上一句话也可写成： It’s our goal to make work efficient. 我们的目标是让工作更有效率。 It’s very important for us to learn English well. 学好英语对于我们来说很重要。 2. 动词不定式作宾语 1). 动词不定式跟在及物动词后作宾语，这种形式非常常见，就是我们平时积累的一些动词后面跟to do形式，如： I have decided to study hard. 我已经决定要刻苦学习。 常见的这类动词有：begin, choose, continue, decide, expect, fail, forget, hate, help, hope, learn, manage, mean, need, offer, plan, prefer, pretend, promise, refuse, try, want, wish, determine, afford, agree, start, like等。 2). 在find，think后跟不定式时，常用it代替，而将真正宾语，即不定式放在后面，如： I find it not easy to achieve one’s goal. 我发现实现一个人的目标并不容易。 3). 有些不定式结构中的to会省略，直接跟动词原形，这样的结构有：Why not do…, Why don’t you do…, had better (not) do…, would rather do…等，如： I would rather stay at home. 我宁愿待在家里。 3. 不定式作宾语补足语 1). 不定式宾补很常见，结构为：动词+sb. to do sth, 这样的动词有：tell, ask, want, allow, get, would like, encourage等，如： The teacher advised us to have a rest first. 老师建议我们先休息一下。 2). see, hear, watch, notice, have, make, let等动词后作宾补的动词不定式不带to，但变为被动语态以后（即不定式作主补时）要带to，如： My mom made me clean the house. =I was made to clean the house by my mom. 我妈妈让我把房间打扫干净。 注意：help（帮助）后作宾补的动词不定式可带to，也可不带to，即help sb.(to)do sth.，如： He often helps his parents (to) do their housework. 他经常帮助他父母做家务。 4. 不定式作定语 不定式有时起形容词作用，修饰名词，代词，在句中作定语。不定式作定语位于所修饰的名词，代词之后，如： Who was the first one to get to the top of the hill yesterday?
初中英语动词不定式部分知识讲解及练习
动词不定式 一. 定义： 动词不定式是非谓语动词的一种，它没有人称和数的变化，在句子中不能独立作谓语，但它仍保持动词的特点，既可以有自己的宾语和状语。同时动词不定式又具有名词、形容词、副词的特征，在句中可以作主语、表语、宾语、宾语补足语、定语和状语。 二. 动词不定式的构成：to+动词原形 三. 动词不定式作宾语 后面能接不定式作宾语的动词有：agree, ask, choose, decide, forget, hope, learn, want, wish, would like等。 We hope to get there before dark. 我们希望天黑以前到那儿。 The girl decided to do it herself. 那个姑娘决定自己做那件事。 动词不定式作宾语的注意事项（2点） 1. 有些动词既可跟不定式作宾语，也可跟动名词作宾语，但含义不同： remember to do 记住要做某事 remember doing 记得曾经做过某事 forget to do忘记要做某事 forget doing 忘记曾经做过某事 stop to do 停下来去做某事 stop doing 停止做某事 go on to do 继续做另一件事 go on doing 继续做原来在做的事 I remember seeing you somewhere before. 我记得以前在哪儿见过你。 Please remember to turn off the light when you leave. 离开时请记得关好灯。 2. 不定式作宾语时，如带有宾语补足语，则要把不定式放到后面，用it作形式宾语，构成“主语+动词+it+宾补（形容词、名词）+不定式”结构。 如：He found it very difficult to get to sleep. 他发现很难入睡。 四. 动词不定式作宾语补足语 1. 后面能接to不定式作宾语补足语的动词有：ask, order, teach, tell, want, wish, help 等。 The teacher told us to do Exercise 1. 老师要我们做练习一。 I want both of you to go. 我要你们俩去。 We helped her (to) repair her bike. 我们帮助她修理自行车。 2. 使役动词let, have, make及感官动词see, watch, notice, hear, feel等要以不带 to的不定式作宾补。 Let’s have a rest. 我们休息一会吧。I saw him come in. 我看见他进来了。 感官动词后既可跟不带to的不定式作宾补，也可跟v-ing作宾补，前者表示动作的全部过程已结束；后者表示动作正在进行。 I saw him come downstairs.我看见他下了楼。（说明他下楼了这件事） I saw him coming downstairs.我看见他在下楼。（说明他下楼时的情景）
动词不定式用中考
中考英语试题中的“动词不定式”考点透视 动词不定式是一种非谓语形式，其基本形式：to＋动词原形，有时将to省略。下面结合中考英语试题，对其考点进行分析，希望对同学们全面掌握其用法有所帮助。 一、考查动词不定式的否定式 1．The teacher told Xiao Ming ________ late for school again．（2001福州） A．not to be B．not be C．don't be D．not to 2．Mrs Black asked the man ________ the queue．（2001广西） A．not to jump B．to not jump C．didn't jump D．not jump 3．You'd better ________ when your mouth is full of food．（2001广州） A．don't speak B．not to speak C．not speak D．not speaking 分析：动词不定式的否定形式是在不定式符号to前加not，但要注意：had better后接不带to的不定式，其否定式为：had better not do sth．。 二、考查动词不定式作主语 4．It's good ________ others when they are in trouble．（2001四川） A．helping B．to help C．help D．helps 分析：动词不定式作主语，常放在句中，而用it作为形式主语，置于句首。 三、考查动词不定式作宾语 5．All of us found ________ difficult to work out the maths problem．（2001黑龙江）A．it B．that C．which D．what 6．I thought ________ interesting to work in the fields．（2001连云港） A．that B．it C．this D．／ 7．She needs ________ warm clothes because it's cold today．（2001广东） A．wear B．wearing C．to wear D．to be worn 分析：要求用动词不定式作宾语的动词很多。但要注意：（1）动词不定式作think，make，find，feel等的宾语时，常用结构为：think ／make ／find ／feel＋it＋宾补（adj．／n．）＋to do sth；（2）need作实义动词时，后面可跟不定式作宾语。 四、考查动词不定式作宾语补足语 8．He asked me ________ to his birthday party．（2001长沙） A．to go B．go C．goes D．went
初中英语语法精讲动词不定式用法(教案)
动词不定式用法 动词不定式没有人称和数的变化，在句中不能独立作谓语。但动词不定式具有名词、形容词和副词特征，在句中可以作主语、宾语、宾语补足语、定语、表语和状语等多种成分。另外，动词不定式具有动词特点，可以有自己的宾语和状语，组成动词不定式短语。动词不定式的肯定形式是to＋do；其否定形式是not to＋do。 下面以动词不定式在句中的作用来予以详细说明。 1．作主语 可以直接作主语。如：To see is to believe． 但在英语中，常用it作形式主语，真正的主语即动词不定式放在后面。如： It's wrong to play tricks on other people． It's our duty to keep our environment clean and tidy． 点击规律：动词不定式在句中作主语时，常放在It is ＋adj +(for sb.)＋(not)to do sth句型中，表示说话人对客观事件的决断，意为：做…..是……的，it仅作形式主语，真正的主语是to do sth It is very interesting to read.读书是有趣的 It is useful to read.看书是有用的 It is healthy to run every day.每天跑步是健康的 It is a little difficulty for me to work out this question.解出这道题对我来说有点难 It is bad not to finish homework.不完成作业是糟糕的 It is bad to be late for school.迟到是糟糕的 It is+adj+of sb +(not)to do sth该句型通常表示说话人对客观事件的惊讶、兴奋、懊悔、难过等感叹情绪，与It is ＋adj +(for sb.)＋(not)to do sth的意义不同。 It is very kind of you to tell me the truth．你能告诉我事实，真是太好了 It is stupid of him to do such a silly thing．他做那件傻事，真是太笨了 It is very clever of you to work out this question. 你能解出这道题目，真是太聪明了 It is very wise of you to read this novel. 你看这本小说，真是太明智了 这个句型中用介词of而不是for的原因是这里的形容词是用来形容人的品质性格的。 类似的词有：careless，careful，clever，considerate，foolish，good，impolite，kind，naughty，nice，silly，stupid，friendly 因此区分是用It is ＋adj +(for sb.)＋(not)to do sth还是It is+adj+of sb +(not)to do sth，要