人教版英语八年级上册Unit5动词不定式用法总结

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人教版英语八年级上册Unit5(语法全解)：动词不定式

动词不定式全解不定式作宾语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, he lp intend like, love, need prefer, prepare, p romise, 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+ todecide, know, consider forget, learn, remember, show, understand, see, wonder, hear, find out, explain, tellPlease show us how to do that. 请演示给我们如何去做。

八年级上册语法训练unit 5 ：动词不定式

八年级unit 5语法训练：动词不定式1.动词不定式的基本形式to + 动词原形有时可以不带to(秃头不定式）2.动词不定式的否定形式not + to do3.动词不定式在句子中可以作什成分？1.作主语2. 作宾语3. 作宾语补足语4. 作定语5. 作状语6. 作表语7. 与疑问词等连用4.动词不定式用法/功能，并总结：(1). 作主语To see is to believe.It’s exciting to surf on the Internet作主语的不定式如果很短，通常位于句首；若不定式（短语）较长时，常用it作形式主语，而把真正的主语（即动词不定式）放在后面以避免头重脚轻。

(2) 宾语I want to go home.The workers decided to get better pay.常用动词不定式作宾语的动词有：want, hope, wish, refuse, learn, would like, choose, decide, agree, pretend, expect, plan …He found it very difficult to get to sleepThe boss makes them work 15 hours a day.(3). 宾补The teacher told me to clean the blackboard.I expect you to give me some help.常用动词不定式作宾补的动词有：tell, ask, want, warn, wish, allow, encourage, expect, teach, hel(4). 定语I have something to say.He has a lot of homework to do .(5) 状语He got up early to catch the train.She is old enough to dress herself动词不定式作状语主要用来表示目的，原因，或结果等。

人教版初二上册英语Unit 5语法知识点总结(精选)

人教版初二上册英语Unit 5语法知识点总
结（精选）
一、语法动词不定式与动名词(小结)
动词不定式与动名词都属于非谓语动词。

有些结构中必须用动词不定式，有些结构中必须用动名词，有些结构后面既可以跟不定式，还可以跟动名词，但意义不同。

一)动词不定式
1、什么是动词不定式
动词不定式由to+动词原形构成。

这里的to是不定式标志，没有词义。

不定式的否定结构是在动词不定式前直接加not。

不定式具有名词、形容词或副词的某些语法功能，又有动词的时态和语态的特点及作用。

常见的形式如表所示(以及物动词do为例)，不及物动词没有被动语态。

主动语态被动语态
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
2、不定式功能及常见不定式
第一类：动词+不定式
语法分析：有些及物动词后面可以用不定式表示动作的对象，这时不定式相当于名词或代词，做及物动词的宾语。

1) want to do sth. 想做某事
①Do you want to watch a game show?
通过对人教版初二上册英语Unit 5语法知识点总结(精选)的学习，是否已经掌握了本文知识点，更多参考资料尽在!。

人教新目标英语八年级上册unit5单元知识点归纳总结

人教新目标英语八年级上册Unit 5 知识点归纳总结学习目标：1、本节课主要预习八上U5基础知识2、语法：掌握不定式作宾语的用法。

一.重点词汇1.plan v. 计划；打算plan sth. “计划某事”，后接名词或代词。

They are planning their vacation now. 他们正在计划他们的假期。

plan to do sth. “计划去做某事”，to是动词不定式符号，不是介词。

They plan to buy a new car. 他们计划买辆新车。

【拓展】现在分词：planning, 过去分词：planned【拓展】plan还可作名词，意为“计划”。

make a plan意为“制定计划”I make a plan last night.昨天晚上我制定了一个计划。

2.happen vi.发生；碰巧；出现；偶遇A great earthquake happened in Japan on March 11, 2001.在2011年3月11日，日本发生了一场大地震。

【搭配】表示“某人发生某事”，常用结构”sth.+happen+to+sb.”What happened to your father on that day? 你爸爸那天发生什么事了？【拓展】happen还可以表示“碰巧”，sb.happen to do sth.“某人碰巧做某事”。

I happened to see a car accident on my way to school yesterday.昨天我在去学校的路上碰巧看到一场车祸。

3.expect v.预期；期待；盼望expect为动词，意为“期待，预料”，常用结构为：（1）expect (sb.) to do sth. 期望（某人）去做某事We expect to finish the way by Friday.我们期待到周五能完成工作。

I expect you to make more progress.我期望你能取得更大进步。

（完整版）人教版英语八年级上册Unit5动词不定式语法详解

（完整版）人教版英语八年级上册Unit5动词不定式语法详解Unit5 动词不定式语法详解不定式结构肯定：to + do sth. 否定：not + to do sth.一、作主语To study hard is very important. → It is very important to study hard.注意: 不定式作主语时，通常用it作形式主语, 把真正的主语放在后面。

练习1、It is necessary ______us to learn to wait. (of/for) 2、It took them 1,000 yuan _________this table. (buy)二、作表语My job is to teach English.我的工作是教英语。

The most important thing is to learn something new and have fun.最重要的是学习新的东西和过得愉快三、作宾语1、动词+ to do sth.常用动词有：want / wish / like / would like / hope / plan / try / decide / learn / need / agree / begin / start / forget / remember / manage / seem / fail/ manage/ promise等e.g. I hope to finish it tomorrow . She plans to go and teach in the country.2、动词＋疑问词+to doe.g. 我不知道接下来该做什么。

I don’t know____________ next.她不能决定买哪本书。

She can’t decide_________________.练习1、Don’t forget _________________.(关灯) 2、Sam is learning________________. (怎样开车）四、作宾语补足语——对宾语进行补充说明1、动词+ 宾语（sb./sth.) + to do sth. 常用动词有：ask, tell, allow, want, expect 等e.g. The teacher asked her to answer the question. The doctor told me to have a good rest.2、动词+宾语+不带to的不定式, 动词多为感官动词、使动词。

人教版英语八年级上Unit 5动词不定式

动词不定式一、结构：动词不定式分为带to不定式（to do sth.）与不带to 不定式（do sth.）。

其中，to 不是介词，而是动词不定式符号，无意义，可以不翻译。

肯定式：to do 否定式：not to do二、作用：在句子中可以作主语、宾语、表语、宾语补足语、定语或状语等。

三、用法：1､作主语不定式作主语时，谓语用单数(如并列时则用复数)。

往往用it作形式主语，把不定式放在谓语后面。

常用结构为：It is + adj. /n.(+ for sb.) + to do sth.It is + adj./n. + (of sb. )+ to do sth.e.g. To watch movies is my hobby.To fight with crime is dangerous.It’s enjoyable for me to have dinner with you.It’s necessary to learn every subject well.It’s kind of you to che ck the information carefully.2､作宾语（1）动词+不定式：v.+ to do sth.下列动词（短语）通常用不定式作宾语：help（带to不定式或不带to 不定式皆可）, need, want, hope, wish, expect, learn, decide, choose, would like, like, love, begin, start, stop, try, forget, remember等。

e.g. He decided to go on a vacation.James chose to work in the city.Teachers teach to learn something.（2）动词（know, ask, show, teach, find out等）+疑问词+不定式: v. + wh- /how+ to do sth。

八上英语 U5 动词不定式

Unit 5 动词不定式动词不定式: 肯定式: to do 否定式: not to do 省略to的: do1、不定式作宾语口诀：决定想做计划需要同意，能做被用来做的事,迫不及待下决心做过去常常未能做的事decide to do sth. 决定做某事want ∕ would like to do sth. 想做某事plan to do sth. 计划做某need to do sth. 需要做某事agree to do sth. 同意做某事can’t wait to do 迫不及待地要做某事decide to do 下决心做used to do 过去常常做某事2、不定式作宾语补足语的动词：ask sb. to do sth. 请求某人做某事tell sb. to do sth. 告诉某人做某事order sb. to do 命令某人做某事。

want sb. to do sth. 想要某人做某事invite sb. to do sth. 邀请某人做某事expect sb. to do sth. 期待某人做某事encourage sb. to do sth. 鼓励某人做某事advise sb. to do sth. 建议某人做某事省略to的情况（动词原形do) :使役动词：let, make, have...感官动词：feel, hear, listen to, look at, see, watch, notice...情态动词：can, must, could, should, have to, may, need...3、动词不定式和疑问词连用动词不定式可以和疑问词what ,which, how, where, when + to doI don’t know where to go. He showed me how to use a computer.不定式的重要句型1)It is +adj. ＋for / of sb.+to do sth.2）too＋形容词／副词＋（for＋sb.）＋to+动词原形表示“……太……而不能……”。

人教版英语八年级上册第五单元知识点归纳

八年级上册 Unit 5 Do you want to watch a game show?一．词的转换1.new（adj.）新的→（n.）news 新闻2. lose →lost () 丢失cational （adj.）教育的，有教育意义的→（vt.）educate 教育→（n.）education 教育4. successful (adj.) 成功的→（vt.）succeed 成功→（n.）success 成功5.unlucky (adj.)不幸的，倒霉的→（adj.）lucky 幸运的→（n.）luck 运气6. lose →lost () 丢失二．短语归纳1.think of认为2. learn from从……获得；向……学习3.find out 查明；弄清楚4. talk show谈话节目5.game show游戏节目6.soap opera肥皂剧7.go on发生8. watch a movie看电影 9.a pair of一双；一对10.try one’s best尽某人最大努力11.as famous as与……一样有名 12. have a discussion about就……讨论13.one day有一天 14.such as例如15.dress up打扮；梳理16.take sb.’s place代替；替换17.do a good job干得好 18.something enjoyable令人愉快的东西19.interesting information有趣的资料20.one of……之一21.look like看起来像22.around the world全世界23.a symbol of……的象征三．用法集萃1.let sb. do sth.让某人做某事2. plan to do sth.计划/打算做某事3.hope to do sth.希望做某事4.sth happen +时间、地点某地、某事发生了某事5.expect to do sth.盼望做某事6.How about doing…?做……怎么样？7.be ready to do sth.乐于做某事8. try one’s best to do sth.尽力做某事四．难点讲解1.I don 't mind them. 我不介意它们。

人教版初二上册英语第五单元unit 5语法篇

Unit 5 语法篇动词不定式:肯定式: to do 否定式: not to do 省略to的: do1、不定式作宾语口诀：决定想做计划需要同意，能做被用来做的事迫不及待下决心做过去常常未能做的事decide to do sth. 决定做某事want ∕ would like to do sth. 想做某事plan to do sth. 计划做某need to do sth. 需要做某事agree to do sth. 同意做某事can’t wait to do 迫不及待地要做某事decide to 下决心做used to do 过去常常做某事2、不定式作宾语补足语的动词：ask sb. to do sth. 请求某人做某事tell sb. to do sth. 告诉某人做某事order sb. to do 命令某人做某事。

want sb. to do sth. 想要某人做某事invite sb. to do sth. 邀请某人做某事expect sb. to do sth. 期待某人做某事encourage sb. to do sth. 鼓励某人做某事advise sb. to do sth. 建议某人做某事省略to的情况:使役动词：let, make, have感官动词：feel, hear, listen to, look at, see, watch, notice3、动词不定式做主语动词不定式作主语用的动词不定式常常为it替代，动词不定式（或短语）放在后面。

例如：It is not easy to learn a foreign language.It took us three days to do the work.4、动词不定式和疑问词连用动词不定式可以和疑问词what ,which, how, where, when 等连用，构成不定式短语。

如：I don’t know where to go.He showed me how to use a computer.What to do is a big problem.一、请找出下列动词中以动词不定式为宾语的动词并圈出来。

八年级上册英语动词不定式用法

八年级上册英语动词不定式用法一、不定式一般式的用法1. 表示未发生的动作即表示发生在谓语动作之后的动作。

如：I expect him to arrive tomorrow. 我预计他明天到达。

I hope to catch an early train. 我希望赶上早班火车。

The doctor advised me to take a complete rest. 医生建议我完全休息。

2. 表示同时发生的动作即表示与谓语动作同时发生或略先于谓语动作的动作。

如：Who heard him say that? 是谁听到他这样说的?(say与heard几乎同时发生)I’m sorry to hear that. 听到这事我很难过。

(to hear 略先于am sorry)3. 表示一般情况即看不出动作的先后关系，而是表示一种情况或现象。

如：Washing the car seems to be your main hobby. 擦洗汽车似乎是你的主要爱好。

None of her many lovers seemed to want to marry her. 在她的许多情人中似乎没有一个愿意娶她的。

二、不定式进行式的用法1. 表示同时进行即表示与谓语动作同时发生且正在进行的动作。

如：He seems to be following us. 他似乎在跟着我们。

He pretended to be looking for a book. 他假装在找书。

I happened to be looking out of the window when they arrived. 他们到达时我碰巧正向窗外望去。

2. 表示将来正如可用进行时态表示将来意义一样，不定式的进行式有时也可表示将来。

如：You are lucky to be going by air. 你挺幸运的，能乘飞机走。

He was happy to be coming home. 就要回家了他感到高兴。

Unit5知识点语法人教版八年级英语上册

姓名_______________ 上课时间__________________Unit 5 语法：动词不定式动词不定式作宾语1.构成基本形式：to+动词原形；有时可以不用to，to是不定式符号，本身无词义。

否定形式：not+(+to)动词原形2.句法功能：不定式可以作主语，表语，宾语，宾补，定语，状语，也就是除谓语动词之外的任何成分。

3.本单元重点是不定式宾语。

（1）只能接to do作宾语的动词：三个希望两答应：hope，wish，want，agree，promise。

两个要求莫拒绝：demand，ask，refuse。

设法学会做决定：manage，learn，decide。

不要假装做选择：pretend，choose。

还有would like，like，plan，expect等表示命令、打算或希望的。

（2）在find，think等后跟不定式作宾语时，常用it代替，而真正的宾语放在后面。

I find it easy to read English every day。

（3）常见的一些不带to的不定式：Why not do…，why don’t you do…，had better（not）do…，would rather do…，could/would/will you please（not）…。

I would rather stay at home。

（4）只能作某些动词的宾语，不能作介词的宾语。

（5）不定式常和疑问词what，which，when，where，how连用，相当于一个宾语从句。

He didn’t know where to go。

（6）有些动词后面跟动词不定式时,应将不定式符号to省去。

常见的动词有let,make,feel,help,watch,hear等感官动词和使役动词。

这是动词不定式作宾补。

一感（feel）、二听（hear，listen to）、三让（let，make，have）、四看（look at，see，watch，notice）。

人教版八年级英语上册第五单元语法——不定式讲解

Let’s go.
Du you want to go to the Great Wall one day? ---Yes , I hope to visit the Great Wall one day.
Du you like playing basketball?
Do you plan to(计划做某事) play basketball tonight?
Can you show me where to go?
He knows which jacket to choose/buy.
3下列三个动词（find; think;fee）构成: 主语+ find/think/feel + it + adj.+to do sth
举例：
I find it difficult to learn English well. We all think it interesting to play chess on weekends. I feel it relaxing to wash some clothes.
What can you expect to
(期待做某事) learn from sports shows?
总结：以上例句都含有动词不定式即：to do sth
:不定式是非谓语动词的一种，其中to 是不定式的符号，后接动词原形，不定式无人称和数的变化，不定式和其后面的名次等构成不定式短语，在句子中可以做：主语；宾语；表语，定语，状语和宾语的补足语，简称宾补或补语。就是不能做谓语，故而称作“非谓语动词”
A most comfortable most comfortably
B the most comfortable most comfortably

八年级英语上册第五单元语法(供参考)

八年级英语Units 5单元语法非谓语动（固定用法）常见动词不定式词组、句型用法总结1. 动词不定式宾语和宾语补足语以下动词后常跟不定式作宾语和宾语补足语want to do sth agree to do sthdecide to do sth plan, to do sthlearn to do sth hope to do sthfail to do sth happen to do sth ,offer to do sth try to do sthwould like to do sth remember to do sthforget to do sth seem to do sthvolunteer to do sth help sb do sth /to do sthin order to do sth get/be ready to dowish sb. to do sth. can’t wait to dohave to do sth can/can’t afford t domake a decision to do sth, be sure to do sthbe able to do sth stop to do sthallow sb to do sth ask sb to do sthtell sb to do sth show (sb) to do sthteach (sb)to do sth invite (sb) to do sthencourage(sb)to do sth prefer to do sthrefuse(sb)to do sth expect to do sthsb need to do sth / sth need doing/ sth need to be done2 sb be + adj（表示人心情的词）+ to do sthsb+be +sorry / glad / surprised / pleased / angry / happy / sure /excited/ amazed/relaxed/ lucky/ to do sth3.. too …to do sth too +adj/adv+ to do sth4.….enough to do sth adj/adv+ enough +(for sb )to do sth5 疑问词+不定式：how ,when , where, what, which + to do sth6 .固定短语后用动词不定式：(do)try one’s best to do sth,It takes sb some time to do sth,It’s one’s turn to do sth.It’s time(for sb.) to do sth.find/think/feel it +adj. to do sth.It’s + adj + to do sthIt’s + adj + of / for sb to do sthIt’s easy / hard / important/ / impossible / interesting / difficult / necessary / …for sb to do sth（adj描述不定式to do sth的特点，性质时经常使用for sb）It’s good / kind / nice / wise / clever/ rude / patient / polite / foolish / right / wrong / careful of sb to do sth (描述主语人的性质，身份和特点时经常使用of sb)7 .the+序数词first/second/third…+名词/代词+to do sth表示第几做…8．.名词或代词+不定式。

Unit 5重要知识点讲解人教版八年级英语上册

Unit5Do you want to watch a game show?重要知识点讲解1. 不定式做宾语：want/ hope/ expect/ plan to do2.Learn…from 从…学习 learn sth by heart熟记learn sth by oneself自学3. Plan to do sth/ plan on sth计划、打算做某事Plan for sth考虑到某事make a plan for… 为…制定计划4. Hope to do/ hope that 希望（没有hope sb to do的表达）I hope so/ I hope not5. Happen to sb/ sth某人/物发生不幸的事 eg：What happened to him？Happen to do/ it happens that 碰巧Happen偶然发生take place事先安排的、人为的发生6. Expect (sb) to do/ expect that 期待7. One day某天（过去、将来）some day某天（将来）the other day=a few days ago 前几天8. Mean v.意味着（三单为means）Means n.方法、工具、手段by means ofMeaning n. 意义、含义the meaning ofMeaningless adj. 毫无意义的9. Mind v.介意would/ do you mind (one’s)(not) doing sth?I don’t mind them.make up one’s min d下决心change one’s mind改变主意never mind没关系、不必担心keep in one’s mind记住10，think of认为、想起think about认为、考虑think over仔细考虑11，be famous for因为…而著名be famous as作为…而著名12，appear v.出现（→disappear消失）appearance n. 出现、露面、外表13，come out出版、发表，出来，开花14，succeed v.成功 succeed in (doing) sth成功地做某事Success n.成功Successful adj.成功的be successful in (doing) sth成功地做某事Successfully adv.成功地15，reason结论性原因cause起因 excuse借口16，danger n.危险be in great danger处于极大危险中out of danger脱离危险endanger v. 使遭遇危险，危及dangerous adj. 危险的endangered adj.有灭绝危险的17，luck n.运气—lucky adj.幸运的（→unlucky不幸的）—luckily adv. 幸运地18，be ready to do sth愿意做某事get ready to do sth准备去做某事get ready for为…做准备19，a pair of+ n复数做主语，谓语动词用单数eg：A pair of glasses is enough for me.20，Take one’s place to do sth代替某人做某事21，do a good job干得好22，wear 表状态，接服装、手套、眼镜、香水等put on 表动作，接服装（→take off）dress 表动作，接sb/ oneselfget dressed穿衣dress up盛装打扮try on试穿（动副结构）try it on(be) in+颜色或衣服eg：The girl in a red coat is my sister.词语辨析1.the other, the others, other, others,another 辨析the other 表示特指两个或者两部份中的另一个或另一部分，可直接单数名词或复数名词。

最全面人教版八年级上册英语第五单元知识点归纳总结

Unit 5 Do you want to watch a game show?一、词汇与短语● 重点单词A部分1.sitcom n. 情景喜剧2.news n. 新闻节目；新闻3.mind v.介意;对（某事）烦恼4.stand v. 忍受；站立cational adj.教育的；有教育意义的6.plan v. & n. 几打算；计划7.hope v. & n. 希望8.discussion n. 讨论；商量9.happen v. 发生；出现10.expect v. 预料；期待11.joke n. 笑话；玩笑edy n. 喜剧；喜剧片B部分1.meaningless adj.毫无意义的；意思不明确的2.action n. 行动3.cartoon n. 动画片；卡通片4.culture n. 文化；文明5.famous adj. 著名的；出名的6.appear v. 出现7.become v. 开始变得;变成8.rich adj. 富有的9.successful adj. 获得成功的；有成就的10.might modal v. 可能；可以11.main adj. 主要的；最重要的12.reason n. 原因；理由mon adj. 普通的；常见的14.film n. 电影15.unlucky adj. 不幸的；不吉利的16.lose v. 失去；丢失17.ready adj. 愿意的；准备好的18.character n. 人物；角色19.simple adj. 简单的；易做的20.army n. 陆军；陆军部队● 重点短语A部分1.talk show 谈话类节目2.game show 游戏类节目3.soap opera 肥皂剧4.sports show 运动类节目5.think of 想起；认为6.plan to do sth. 计划做某事7.hope to do sth. 希望做某事8.my favorite TV shows 我最喜欢的电视节目9.go on 发生10.have a discussion about 就…进行讨论11.expect to do sth. 期望做某事12.learn from 向…学习B部分1.action movie 动作影片2.over 80 years ago 八十多年前e out 出版；发行4.in the 1930s 在20世纪30年代5.try one's best 尽某人最大努力6.one of the main reasons 主要原因之一7.dress up 装扮;乔装打扮8.be ready to 准备好（做某事）；愿意（做某事）9.do a good job 干得好10.take sb.'s place代替某人；替换某人● 重点句子A部分1.--What do you think of talk shows? “你认为访谈类节目怎么样？”--I don't mind them. /I can't stand them. /I love watching them.“我不介意它们。

Unit5语法知识清单人教版英语八年级上册+

动词不定式⏹概述：动词不定式是一种___________形式。

其中to不是介词，而是动词不定式的符号。

⏹基本结构：_____________________________否定结构：_____________________________⏹特点：①没有人称和数的变化②有时态和语态的变化③可以有自己的状语和宾语⏹动词不定式在句中可作主语、表语、定语、状语、宾语、宾语补足语一、作主语1. 不定式直接作主语To learn a foreign language is not easy.学会一门外语并不容易。

2. it作形式主语，不定式（短语）作真正的主语= It’s not easy to learn a foreign language.二、作表语The important thing is to finish the work on time.重要的是按时完成工作。

三、作定语：置于____________________________I have a lot of things to do in my spare time.在业余时间我有许多事情要做。

四、作状语（可表目的、结果、原因）To catch the train, we have to get up early.为了赶火车，我们不得不早起。

五、作宾语1. 动词+ to do sth.拒绝、选择和同意( refuse, choose, agree )期望、决定和学习( expect, decide, learn )宁可、假装和计划( prefer, pretend, plan )希望、想要和愿意( wish/hope, want, would like )需要need，失败fail，要求ask，似乎seem，支付afford 设法manage，答应promise2. 疑问词+to do sth.decide, know, ask, tell, teach, guess, show, remember, forget, find out等后接“特殊疑问词+不定式”作宾语。

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动词不定式总结
形式：
形式
情况
例句
带to的不定式结构
直接跟带to的不定式结构的动词有：want，ask，hope，try，remember，stop，like，love，forget等。
I want to go shopping with you on Sunday.
Did he ask you to post the letter for me.
不带to的不定式
结构
had better do sth.最好做某事
You had better give it to him at once.
We had better not go there on foot.
一感（feel）二听（listen to / hear）三使（make / let / have）
作定语
He has three children to look after.（后置定语）
作宾语补足语
I told him to write a diary yesterday.（不带to的不定式）
The teacher made us learn the poem by heart.（不带to的不定式）
例句
作主语
To learn English is not very easy.
= It is not easy to learn English.（it为形式主语）
作宾语
How long do you decide to stay here?
I found it not easy to get on well with him.（it为形式宾语）
Can you help me（to）plant a tree?
Why not do sth.? = Why don’t you / we do sth.?为什么不……呢？
Why not go there by taxi?
= Why don’t we go there by taxi?
用法：
句中成分
四看（look at / see / watch / notice）
半帮助（help sb.（to）do sth.）
Do you often hear him sing in his room?
Don’t make him stand outside.
I often see them play football on Saturday.
作状语
He stopped to have a rest.（用作目的状语）
作表语
My ambition is to be a lawyer in the future.
和疑问词连用，用作宾语或
宾语补足语
I don’t know where to go for my holiday.
Have you told him when to start tomorrow?