动词不定式精讲

1. 作主语

作主语的不定式如果很短，通常位于句首，如：To see is to believe.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。常见句型为：“It”s +名词（for + sb）+ to do sth“和”It“s +形容词（for / of + sb）+ to do sth”。注意：在这个句型结构中，若形容词表示与人有关的“赞美”或“批评”时用of，如kind，nice，good，clever，bad等；否则用for.如：

It“s easy for you to answer the question.

It“s very kind of you to help me.

2. 作表语

动词不定式可以作be，seem，appear等系动词的表语。如：

Her job is to take care of these children.

3. 作状语

动词不定式放在come，go，stop等动词后作目的状语；放在sorry，glad，surprised，pleased，angry等形容词后作原因状语；动词不定式作状语表示结果时常与副词too或enough连用。注意：too…to与so…that…和（not）…enough to…可以相互转换：如：

She is so weak that she can“t move the box.

=She is too weak to move the box.

=She is not strong enough to move the box.

4. 疑问词+不定式

疑问词+不定式=名词短语，可作主语、宾语或表语。注意：名词短语可以由名词从句转换而来；疑问代词what，which，whom可以作宾语，疑问副词how，when，where，whether不能作宾语。如：

I didn“t know what I should do. = I didn”t know wheat to do.

I didn“t know how I should do it. = I didn”t know how to do it.

5. 几种不带to的动词不定式句式

had better…， Why not…？ Will / Would you please…？等句型后接不带to的不定式。如：

You had better stay at home. Why not see a doctor？

高中动词不定式用法讲解及练习电子教案

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Grammar Presentation---动词不定式一、不定式的句法功能 ●不定式作主语 ?To learn a foreign language is not easy.学习外语不是一件容易的事。 ◎不定式短语作主语时，常用it作形式主语来代替它的位置，而将真正的主语（不定式短语）移到谓语之后 ?It’s a great honor to be invited to Mary’s birthday party.很荣幸被邀请参加玛丽的生日聚会。 ●不定式作宾语 ◎作动词宾语 ◇下列动词常接不定式作宾语，如：agree, arrange, ask, beg, choose, dare, decide, demand,expect, fail, fear, hope, manage, offer, plan, prepare, pretend, promise, ?They hope to find new resources for mankind.他们希望为人类找到新资源。 ◇如果不定式作宾语且有自己的补语，常用“it”作形式宾语，而把真正的宾语放在后面。下列动词常用it作形式宾语，如：believe, consider, feel, find, know, make ?I know it impossible to finish so much homework in one day. 我知道在一天中完成这么多的作业是不可能的。 ●不定式作表语 ◎不定式作表语时，一般紧跟在系动词后，说明主语的内容 ?The first step is to check the victim’s breathing.

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情态动词用于推测的情况，指对某事情的发生与否进行推测，后面接不同的内容表示对不同的时态所发生的事情与否进行推测。 1.情态动词+动词原形对应于一般现在时，表示对经常发生的，有规律的事情的推测 2.情态动词+be+v-ing 对应于现在进行时，表示对正在发生的事情的推测 3.情态动词+have+v-ed 对应于现在完成时及一般过去时，表示对过去的或已经完成的事情的推测对某事情的发生与否进行推测常用的情态动词： 1.对事情的肯定的，完全有把握的推测用must，意思为“一定” 2.对事情的肯定的，不是完全有把握的推测，依照对其发生概率的肯定程度的强弱大小，依次用could, may, might,其肯定程度逐渐减弱，意思为“可能”。 3.对事情的否定的，完全有把握的推测用can't，表示“一定不，不可能” 4.而疑问句中表示推测时，用can, could, 表示“可能” 所以两个部分结合起来 1. must be 一定是 could/may/might be 可能是 can’t be 一定不是，不可能是

must do sth 一定... could/may/might do sth 可能... can’t do sth 一定不/不可能... You must be hungry, you haven’t had anything since yesterday. They must be twins. They look quite the same. That can’t be Mary. She is in hospital. You can’t be hungry, you have just had lunch. There is someone outside. Who can it be? Can he still be alive after these years? He is not at home, he could/may/might be at school. Anna could/may/might know her address. He said he could/may/might be a little late. I guess he could/may/might come tomorrow. 2.must be doing sth 一定在做某事 could/may/might be doing sth 可能在做某事 can’t be doing sth一定不在做某事 There is a lot of noise from next door. They must be having a party. The police are stopping all the cars. They must be looking for the bad man. What can she be doing now? She can’t be telling the truth.

(完整版)语法精讲：be+动词不定式(用法9种)

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动词不定式讲解

非谓语动词一、英语句子需要遵循一个总原则：一个句子只能有一个动词。当一个句子必须要出现两个或两个以上的动词才能完整表达一个意思时，为了不违法总原则，英语有四种处理方式： 1. 切分成两个或者多个句子 She is a girl. She likes English 2. 将一个谓语动词做主句，其余动词改成从句 She is the girl who likes singing. 3. 添加and, but, or, when, because, not only..but also, either..or 等连词变成并列结构 She got off the bus, but left her handbag on her seat. 4. 将其中一个动词变成非谓语动词形式 She got off the bus, leaving her handbag on her seat. 二、非谓语动词使用条件：一个句子当中，已经存在一个主句（谓语动词），又没有连词(and,but,or等)的情况下，还有别的动词出现时，这时就要用非谓语动词三、非谓语除了不能做谓语外，其他成分都可以做不定式（to do）四、非谓语动词三种形式分词现在分词（doing）过去分词( done ) 动名词(doing) 五、非谓语动词解题技巧： 1. 判断是不是用非谓语动词（1.看有没有逗号 2.看有没有谓语 3.看有没有连词。要牢记英语中逗号不能连接两个句子，一个句子如果没有连词只能有一个谓语） 2. 判断是主语和动词是主动还是被动关系 3. 判断时间, 确定非谓语动词和主句动词谁先发生，谁后发生不定式的用法不定式构成一般式完成式进行式主动关系to do to have done to be doing 被动关系to be done to have been done 不定式动词和谓语动词发生的时间关系不定式的动作和谓语动作同时发生，或发生谓语动作之后 he seems to know a lot 不定式的动作发生在谓语动作之前 I regretted to have told you a lie. 不定式的动作和谓语动作同时发生 I’m glad to be talking with you 不定式否定形式在to前加not. 即not to..... 不定式充当的成分主语，宾语，表语，定语，状语，宾补

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最高考高考英语语法精讲精练专题七情态动词和虚拟语气常考点

最高考届高考英语语法精讲精练-专题七-情态动词和虚拟语气常考点

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专题七情态动词和虚拟语气常考点近两年考查情态动词和虚拟语气的频率呈上升趋势。从整体上把握情态动词的语法特征和语义特征，能够准确理解不同情态动词的细微差异，认真区别具有相同功能、意思相近的情态动词的用法，在真实的交际情景中印证和领悟情态动词的用法和特征。 1情态动词所表示的多种含义 1. can和could的用法 ①表示能力。如： I can run fast. ②表示客观可能性。如： An experienced driver can have an accident at times. ③表示请求和允许。用could 语气更委婉。如： —Can/Could I go now? —Yes，you can. ④表示猜测、惊异、怀疑、不相信的态度(主要用于否定句、疑问句或惊叹句中)。如： Can this be true?

How can you be so careless! This cannot be done by him. 2. may和might的用法 ①表示许可。如： You may drive the car. —May/Might I use your pen? —No，you mustn't. ②用于祈使句中表示祝愿。如： May you succeed! ③表示推测、可能(疑问句不能用于此意)。表推测的might并不是指过去时间，而表示比may把握性略小些。如： He may be very busy now. ④用于表示目的或让步状语从句中。如： No matter what difficulties you may come across，you shouldn't give up. 3. will和would的用法 ①用于各种人称，表示“意志”“意愿”“决心”等。如： I told her to stop crying，but she just would not listen. ②用于第二人称的疑问句，表示说话人向对方提出请求。用would比用will语气更客气。如： Will/Would you please keep the door open? ③表示真理或习惯，意为“惯于，总是”。如： She will listen to music alone in her room for hours. He would get up early when he lived in the country. 4. should的用法 ①表示现在或将来的责任或义务，意为“应该，应当”，这时它可以和 ought to，be supposed to 互换使用。如： You should(＝are supposed to ) complete your test in time. ②表示有较大可能实现的猜测、推论，通常意为“可能；总该……吧”，相当于 be expected to。如： They should be home by now，I think. ③用于第一人称时可以表示说话人的一种谦逊、客气、委婉的语气。如： I should think it would be better to try it again. ④用在条件状语从句中，表示语气较强的假设，意为“万一”，这时也可将should置于从句之首，即将should放在主语前面，而省略从属连词if，主句谓语却不一定用虚拟语气。如： Should I (＝If I should) be free tomorrow I will come. ⑤用来表示意外、惊喜或者在说话人看来是不可思议的。尤其在以 why，who，how 等开头的修辞疑问句或某些感叹句中常常意为“竟会，居然”。如： A gentleman like him should be rude to a lady! ⑥用于虚拟语气句中(略)。 5. ought to的用法表示应该、推测，相当于should。如： You ought to take care of him. 6. shall的用法

动词不定式用法讲解

动词不定式用法小结动词不定式用法小结动词不定式是一种非谓语动词形式，其结构为“to＋动词原形”，其中to不是介词，而是动词不定式的符号，称为小品词，动词不定式没有人称和数的变化。动词不定式和其后面的名词等构成不定式短语，在句子中可以用作主语、表语、宾语、补足语、定语、状语等。一. 作主语例如： To be a doctor is hard. 做医生很难。 To learn English well is not easy. 学好英语不容易。动词不定式（短语）作主语时，为了避免句子的头重脚轻，可以用“it”作形式主语，而把真正的主语－－动词不定式（短语）放在句子的后部。例如上面的句子可以表示为： It is hard to be a doctor. It is not easy to learn English well. 再如： It’s important to plant trees in spring. 如果动词不定式的动作是谁做的，可以在动词不定式前面加一个由介词for 引导的短语，称为不定式的复合结构。例： It’s good for us to read English aloud in the morning. 对我们来说每天早晨大声读英语是很有益的。 It is important for students to use English every day. 对学生来说每天使用英语是很重要的。二. 作表语：动词不定式（短语）作表语常用于系词be的后面。例： His work is to drive a car. 他的工作是开车。 My job is to feed animals. 我的工作是饲养动物。 Her ambition is to be a doctor. 她的理想是当医生。三. 作宾语动词不定式（短语）可以放在一些动词后面用作宾语，能以动词不定式作宾语的动词有：begin,start, want, forget, remember, show, learn, like, hate, love, ask等。例： I want to tell you a story. 我想给你讲个故事。 They begin to work at eight every morning. 他们每天早晨8点开始工作。 Don’t forget to lock the door. 别忘了锁门。 Would you like to go and have a picnic with us tomorrow? 明天和我们一起去野餐好吗？

(完整版)语法精讲：be+动词不定式(用法9种)

be+不定式动词 be+不定式动词”在不同情况下，可以表示很多种不同的语义。下面便是其中九种：一、表示坚决的命令。例如： 1. This naughty boy is to stay here until the class is over. 2. No one is to enter this building without the permission of the security guard. 二、表示计划”或安排的事项”例如： 3. Betty is to be married soon. 4. An in sura nee age nt is to meet us this after noon. 三、表示可能性”例如： 5. Are you to pay the debt for your wife? 6. The lovely puppy is no where to be found. 四、表示意图”或打算”例如： 7. If you are to be there on time, you had better hurry. 8. If all of us are to rema in frie ndly, we must be sin cere with one ano ther. 五、表示应该”例如： 9. You have done so well. You are to be rewarded. 10. Such n asty questi ons are to be avoided. 六、表示不可避免”例如： 11. Anne was won deri ng what was to become of her boy frie nd. Tommy. 12. The murderer was senten ced to life impris onment and was n ever to see his family aga in. 七、表示假设”例如： 13. If I were to do it, I would do it well. 14. Even if you were to take a taxi now, you would not be able to arrive at your destination on time. 八、有期待将来”的含意。例如： 15. The actual usef uln ess of the n ewly inven ted equipme nt is still to be

Unit8 语法精讲精练

Demi Moore is famous__________her film Ghost and Michael but Jordan is famous__________a basketball player. （搭配；介词） A.for；for B.for；as C.as；as D.as；for They brought some food and drink___________they could have them on the way. A.though B.since C.so that D.because （目状） Earth Day__________in 1970 to tell us to protect the earth. A.sets up B.set up C.is set up D.was set up （语态/时态） It’s our duty to save___________energy and produce_________waste. A.more；less B.less；more C.more；fewer D.most；least（比较） —What about going on a trip this weekend? —Well，it all_____________the weather. A.belongs to B.happens to C.depends on D.carries on（搭配） I’ve used up all my paper and I need to buy some. Here“used up”means_____________. A.ate up B.ran out C.ran of D.ran out of（搭配） According to one of our school rules，students are not__________to smoke. A.ordered B.refused C.allowed D.told （语态/搭配） My dream hometown is a place_________any pollution. A.with B.without C.out D.in（介词） If you want to join the club，you will__________pay a lot of money. A.be made B.be made to C.make D.make to（语态/搭配） Loss of health is more__________than loss of money. A.difficult B.easy C.funny D.serious （比较） —You don’t want others to drop litter around，do you？ —____________. It ’s not good to pollute the environment. A.Yes，I do B.I don’t. C.Yes，I don’t D.No，I do（反意） She didn’t use the plastic bag.__________，she took a lovelu shopping basket with her. A.And B.Or C.Instead D.So（副词） Jimmy didn’t go to the party last night because he____________. A.aren’t invited B.hasn’t invited C.didn’t invite D.wasn’t invited（语态） It’s________interesting subject among them. Few students choose it. A.most B.the most C.least D.the least（最高级） —Look at the clouds！Is it going to rain？ —_________.he radio says that we’re getting into the rainy season now. A.I’m afraid so B.I’m afraid not C.That’s impossible D.Of course not（末） —__________ I borrow these magazines？ —Sorry，only the magazines over there can be borrowed. A.Must B.Would C.May D.Need（情态动词） It’s really a good way to save water__________reusing it. A.in B.by C.with D.for（介词） More and more people are used to__________their own bag to go shopping. A.take B.taking C.taken D.took（搭配） Don’t be sad about missing the competition. You____________a second chance. A.will give B.will be given C.have given D.were given（将/语态） What a waste it is if the paper is thrown away without__________?

动词不定式(基础讲解)

动词不定式【概念引入】 1. 动词不定式名言：（1）动词不定式作表语 To lose is to learn. 失败就是学习。（2）动词不定式作主语 It is better to give than to take. 给予比接受更好。（3）不定式作宾语 Expect to be treated as you have treated others. 你怎样待别人，就指望别人怎样待你。（4）不定式作宾补 Adversity causes some men to break，others to break records. 逆境使一些人崩溃，也使一些人破记录。（5）不定式作定语 There is a time to talk and a time to act. 该说的时候说，该做的时候做。（6）不定式作目的状语 To find the exact answer，one must first ask the exact question. 要找到确切的答案，首先必须提出确切的问题。 2. 动词不定式定义：动词不定式是一种非谓语形式（不能作谓语），基本形式是to do形式(to是不定式符号的标志，无意义，可以不翻译) 肯定式：to + 动词原形否定式：not to + 动词原形【用法讲解】 1.动词不定式的特征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。 2. 动词不定式在句子中的作用动词不定式是由to+动词原形构成，在句中起名词，形容词和副词的作用，可以担任除谓语以外的其它任何成分。（1）动词不定式作主语。例如： To master a language is not an easy thing. 掌握一门语言不是一件容易的事情。 To teach English is my favorite. 教英语是我的爱好。 It's my pleasure to help you. 很乐意帮助你。（2）动词不定式作宾语。某些及物动词可以用动词不定式作宾语，这些动词有decide, begin, help, want, wish, like, forget, learn, ask等。例如： I like to help others if I can. 如果有可能的话，我喜欢帮助别人。 I want to buy a new car when I have enough money. 我有钱时想买一辆新车。

最高考2016届高考英语语法精讲精练专题七情态动词和虚拟语气常考点

实用标准文案文档大全专题七情态动词和虚拟语气常考点近两年考查情态动词和虚拟语气的频率呈上升趋势。从整体上把握情态动词的语法特征和语义特征，能够准确理解不同情态动词的细微差异，认真区别具有相同功能、意思相近的情态动词的用法，在真实的交际情景中印证和领悟情态动词的用法和特征。 1 情态动词所表示的多种含义 1. can和could的用法 ①表示能力。如： I can run fast. ②表示客观可能性。如： An experienced driver can have an accident at times. ③表示请求和允许。用could 语气更委婉。如： —Can/Could I go now? —Yes，you can. ④表示猜测、惊异、怀疑、不相信的态度(主要用于否定句、疑问句或惊叹句中)。如：Can this be true? How can you be so careless! This cannot be done by him. 2. may和might的用法 ①表示许可。如： You may drive the car. —May/Might I use your pen? —No，you mustn't. ②用于祈使句中表示祝愿。如： May you succeed! ③表示推测、可能(疑问句不能用于此意)。表推测的might并不是指过去时间，而表示比may把握性略小些。如： He may be very busy now. ④用于表示目的或让步状语从句中。如： No matter what difficulties you may come across，you shouldn't give up. 3. will 和would的用法 ①用于各种人称，表示“意志”“意愿”“决心”等。如： I told her to stop crying，but she just would not listen. ②用于第二人称的疑问句，表示说话人向对方提出请求。用would比用will语气更客气。如： Will/Would you please keep the door open? ③表示真理或习惯，意为“惯于，总是”。如： She will listen to music alone in her room for hours. He would get up early when