情态动词用法顺口溜

情态动词用法顺口溜（通用8篇）

情态动词用法顺口溜 篇1

1. can 的用法：

(1).表示能力、许可、可能性。 表示能力时一般译为“能、会”， 即有种能力，尤其是生来具备的能力，此时may 和must均不可代替它。如：She can swim fast, but I can’t . 她能游得很快，但我不能。I can see with my eyes. 我用眼睛看。

(2).表示许可，常在口语中。如：You can use my dictionary. 你可以用我的字典。

(3).表示推测，意为“可能”， 常用于否定句和疑问句中， 此时can’t 译为“ 不可能”。 如：Can the news be true? 这个消息会是真的吗?—Can it be our teacher?那个人有可能是我们老师吗?—No, it can’t be our teacher. He is on a visit to the Great Wall.不可能。咱们老师正在游览长城呢。

【例题】—I think Miss Gao must be in the library. She said she would go there. —No. She __be there, I have just been there. A.can’t B.mustn’t C.needn’t D.wouldn’t

【解析】根据下文“我刚去过那儿”可知，应为“ 不可能”， can’t 表示推测[答案] A

2. could的用法：

(1).can的过去式，意为“ 能、会”，表示过去的能力。如：He could write poems when he was 10. 他十岁时就会写诗。

(2). could在疑问句中，表示委婉的语气，此时 could 没有过去式的意思。如:Could you do me a favour? 你能帮我个忙吗?—Could I use your pen? 我能用一下你的钢笔吗? —Yes, you can.可以。(注意回答)

3. may的用法：

(1).表示请求、许可，比can 正式，如：May I borrow your bike? 我可以借你的自行车吗?You may go home now. 现在你可以回家了。

【例题】—_______ I borrow your MP3? —Sure . Here you are. A. May B.Should C.Must D. Would

【解析】 在此处表示请求，意为“ 做……可以吗”。 答案：A

(2) .表示推测，谈论可能性，意为“ 可能， 或许”，一般用于肯定句中。 如：It may rain tomorrow . 明天可能会下雨。She may be at home. 她可能在家呢.

(3) .may的过去式为might ，表示推测时。可能性低于may。 如：He is away from school. He might be sick.

他离开学校了，可能是他生病了。

(4) . 表示希望、祈求、祝愿，常可译为“祝愿”。通常是用may +主+V 例如：May you have a good time. 祝你过得愉快。May you be happy! 祝你幸福! May you succeed!祝你成功!

4. must的用法：

(1).must 表示主观看法，意为“必须、一定”。 如：You must stay here until I come back.在我回来之前你必须呆在这儿。Must I hand in my homework right now? 我必须现在交作业吗?

(2) 其否定形式mustn’t表示“ 一定不要 ” “千万别” “禁止, 不许”. 如：You mustn’t play with fire. 你不许玩火。You mustn’t be late. 你一定不要迟到。

(3)对must引导的疑问句，肯定回答为must，否定回答为needn’t 或 don’t have to .如：—Must I finish my homework?我现在必须完成作业吗?—No, you needn’t.不，你不必。

(4)must表示有把握的推测，用于肯定句。如: The light is on, so he must be at home now.灯亮着，他现在肯定在家。

注意其反意问句的构成形式：

当must表示肯定的判断、推测时，其反意疑问句要用实际问句的助动词来构成。如：She must have seen the film before，hasn’t she?(注意反意疑问句的后半部分)You must have met uncle Wang in the shop yesterday，didn’t you? (注意反意疑问句的后半部分)

5. need的用法：

(1).need 表示需要、必须，主要用于否定句和疑问句中，其否定形式为needn’t，意为“没有必要，不必”。 用need 提问时，肯定回答为 must，否定回答为 needn’t或don’t have to。 如：—Need I stay here any longer? 我还有必要留在这儿吗?—Yes, you must .是的。—No. you needn’t /don’t have to. 不， 你不必。

(2).need 还可以作实义动词，此时有人称、数和时态的变化，如果是人作主语后边多接动词不定式。如：I need to do it right now. 我需要马上做这件事。He needs to learn more about the girl.他需要多了解那个女孩。

如果是物作主语，一般用need doing 与 need to be done这种情况下应注意两点：

①.主动形式的动名词doing具有被动的含义;②.该动名词可以改为其动词不定式的被动形式而句子的意义不变。例如：. The door needs painting. = The door needs to be painted. 那扇门需要油漆一下。Your car needs mending. = Your car needs to be repaired. 你的车需要维修了。

6. dare 的用法：dare意为“敢、敢于”, 用法近似于need，有两种词性：

(1)dare 作为情态动词，多用于否定句、疑问句或条件句中，无第三人称单数形式，只有一般现在时和一般过去时。如：Dare he tell them what he knows? 他敢告诉他们所知道的情况吗?I daren’t ask her – will you do it for me? 我可不敢问她，你能帮我问问吗?

(2)dare 作为实义动词，此时有人称、数及时态的变化。如：He doesn’t dare to break his promise.他不敢食言。

注意：在口语中，dare 的各种形式常与不带to 的不定式连用。如：Do you dare tell her what I said?

你敢告诉她我说的话吗?I didn’t dare look at him.我不敢看他。

情态动词用法顺口溜 篇2

一情态动词的基本用法

第一, 表示征求对方意见或许可的情态动词有must, can, could, may, might, shall等, 如:

——Must I hand in my homework today?——Yes, you must.Yes, you have to.

——No, you needn’t.No, you don’t have to (用mustn’t是讲不通的)

Can I come in and have a good look at your house with my girlfriend now? (比较口语化)

——Could I use your mobile phone as mine is power off? (语气委婉)

——Yes, you can. (回答不能用could)

MayMight I use your bicycle? (比较正式, 用might语气更委婉)

Shall I open the window to let in some fresh air? (shall此用法只用于第一和第三人称)

Shall he come to sit in this seat and listen to your speech? (同上)

第二, 表示邀请或请求的情态动词有can, will, would, could, 一般用于第二人称;用would和could时表示语气更加委婉, 如:

CanCould you lend me some money to buy some books and dictionaries?

WillWould you please tell us a story or joke for pleasure?

第三, 表示允许或许可的情态动词有can, may, 如:

You can sit here and do your homework because the seat is not occupied.

You may go to bed and get up as late as you like;nobody cares about that.

第四, 表示禁止的情态动词有can’t, mustn’t, shan’t等否定形式, shan’t多表按照某规定“不能”如:

They can’t wear whatever they like when they are at school.

Anybody mustn’t take books out of the library without permission.

You shan’t hand in your papers ahead of time in the examinations according to the regulations.

第五, 表示建议或劝告的情态动词有ought to, should, had better, need等, 如:

Parents ought to take care of their children when they are young and children ought to look after their parents when they are old. (ought to表示义务, 为别人做某事)

You should do a lot of exercise regularly to improve your health. (should表建议, 多指为自己做某事)

You had better put more clothes in case it is cold on the mountain, boy! (多用于上级对下级, 长辈对晚辈之间)

In order to learn English well, you need practice speaking English more often besides reading. (比较口语化)

第六, 表示能力的情态动词有can, could, be able to等。can表示现在的“能力”, could表示过去的“能力”, be able to用来填充can, could没有的时态, 但waswere able to除了表示过去的能力以外还表示“过去设法做成功某事”, 等于managed to do something或succeeded in doing something, 此用法不能被could代替, 如:

When I was in China I couldn’t speak English, but now in USA I can speak it fluently.

I am sure that this promising young man will be able to support his family in the future.

They charged 20 thousand dollars for the car but I was able to bring the price down. (managed tosucceeded in…)

第七, 表示推测的情态动词有may, might, must, can, could, should, ought to等。must表推测语气最强, 但只用于肯定式, 否定式中用can’t或couldn’t代替;mustmaymightcan’tcouldcouldn’t+have done表示对过去发生事情的推测;should, ought to表示“按理说应该”, 如:

It may be the headmaster’s office.I am not sure. (把握性不大)

He was careless.He might have won the first place otherwise. (过去的可能性很小)

——Who can it be? (can代替must)

——It must be our manager.

——No, it can’t he him.He is in Japan at the moment. (must不能用于否定句, 由can’t代替)

——Was it in the street that he played football yesterday?

——It could be in the street, but I am not sure. (可能性不大)

There were five men in your car during the long journey.It must have been uncomfortable. (=It couldn’t have been comfortable.可能性很大)

He was with me in the class at that time yesterday.He couldn’t have played basketball on the playground yesterday. (动词是过去式时用couldn’t have done, 不用can’t have done)

He should be over fifteen years old, because he is a student in the 11th grade.

She ought to turn up at any moment, for she is always on time for work.

第八, 表示轻微埋怨、责备或后悔的情态动词有shouldought toneedn’tcouldmight+have done, 如:

The movie star has died.You shouldought to have come here earlier. (过去该做而没做)

She is unhappy now.I shouldn’toughtn’t to have told her the bad news. (过去不该做而做了)

I needn’t have carried so much cash.All my bank cards could be available actually. (做了没必要做的事)

You could have married me at that time.I loved and love you but he doesn’t. (过去本可以做但没做)

She was out of mind.She might have passed the exam otherwise. (过去也许会但没有)

第九, 表示警告、允诺、命令或威胁的情态动词是shall, 常用于第二、三人称, 如:

You shall take the book to read as long as I finish it before Friday.

All the candidates shall remain at their seats until the bell rings announcing the end of the exam.

第十, 表示偏执的情态动词是must, 如:

If you must want to know my age, which is a privacy, let me tell you unwillingly.

Must you smoke at a no-smoking area?You will be punished seriously.

第十一, 表示怀疑的情态动词有should (竟然) , dare, can’t, 如:

Such a high official should be so rude to that little girl.What a shame!

How dare you say that I treated you unfairly?Actually I did it right.

Why can’t you know my telephone number and email address?We are good friends.

第十二, 表示习惯性的情态动词有will, would, will表示现在反复, would表示过去反复, 如:

After work he will go to the caféto have a cup of coffee every day.

Whenever and wherever he met him, he would stop the soldier and ask the same questions again and again in the army.

二情态动词用法区别

第一, must&have to。must表示主观上“必须”, have to表示客观逼迫“不得不”, 如:

We must study English very hard, which I like very much.

I have to study English very hard, because I have to pass the exam in the NMET.

第二, would, used to, be used to doing&be used to do sth。would表示过去反复的动作, 而uesd to则侧重“过去如此, 现在已经不是那样了”以及“过去存在的状态”;be used to doing是表示“习惯于做某事”, 其中be有时态和人称的变化, 后跟动名词;be used to do something表示“某东西被用来做某事”, 如:

When he was in that factory, he would go to that coffee shop at the corner after work every day.

He used to smoke and drink a lot, but now he doesn’t.

There used to be a big temple where there is a school now. (过去的状态)

He has been used to working in such bad conditions.

Wood can be used to make desks and chairs as well houses.

第三, didn’t need to do&needn’t have done。didn’t need to do表示“过去没必要做也没做”, 而needn’t have done表示“过去没必要做但已经做了”, 如:

It was raining yesterday.I didn’t need to work in the fields, so I stayed at home. (没去工作)

It was Sunday yesterday.I needn’t have gone to school.But I forgot it and went as usual. (去学校了)

第四, need&dare。这两个词既可用作情态动词, 也可用作实义动词, 一般来说, 情态动词多用于否定和疑问句;实义动词用于各种句式, 后跟动词不定式, I dare say是固定短语, 意为“我认为、我相信”, 如:

——Need I finish my report by six o’clock today? (情态动词)

——Yes, you mustyou have to.

——No, you needn’tyou don’t have to.

As a Chinese high school student, I need to work at least 10 hours a day. (实义动词)

My car needs repairingto be repaired thoroughly. (实义动词, 后跟动名词主动表被动)

Tom daren’t go out alone when it is dark at night. (情态动词)

Dare you go home to face your parents when you haven’t done well in the exams? (情态动词)

I don’t dare to feel the snake even if it is dead. (实义动词)

第五, can’t have done&couldn’t have donecould have done。can’t have done和couldn’t have done均可表示must的否定推测, 强调从现在角度出发推测过去某事“不可能”;但当主句的谓语动词是过去式时, 就必须用couldn’t have done;could have done表示“过去有能力或有可能做某事但没有做”, 有惋惜、遗憾、批评、责备等意思, 如:

His jacket is still here, so he can’t (couldn’t) have gone home. (must的否定式)

My sister met him at the Grand Theatre yesterday, so he couldn’t have attended your lecture. (过去不可能)

You could have walked here instead of taking a taxi;it is so near.

第六, would like to do&would like to have done。would like to do表示现在或将来“想做某事”, 而would like to have done表示过去“想做某事但没做成”, 如:

I would like to go to the concert tonight, but my parents don’t allow me to.

I would like to have gone to the concert last night but I had to review lessons for the exams.

参考文献

[1]张道真.实用英语语法[M].北京:外语教学与研究出版社, 2002

情态动词的用法 篇3

can是最常用的情态动词之一，表示说话人的语气或情感，没有人称和数的变化，在句子中不能单独作谓语，只能和紧挨着它的动词原形一起构成复合谓语。基本意思是“能；会”。can的否定式为can not，缩写为can’t。过去式为could。 具体用法是：

1. 表示能力（如体力和脑力方面），意为“能；会”等。如：

①Can you speak English? 你会讲英语吗？

②Can you play the piano? 你会弹钢琴吗？

2. 表示请求或允许，多用在口语中，意为“可以；能”等。用于疑问句中用来提出要求，如：Can I…？“我可以……吗？”用来征求对方是否允许自己做某事，Can you…？“请你……好吗？”表示说话人的请求，如在句末加上please一词就显得更有礼貌了；用于否定句中表示不允许。如：

①Can I help you? 我能帮助你吗？

②Can you help me, please? 请你帮助我好吗？

③You can’t play basketball. 你不能玩篮球。

3. 表示可能。如：

①He can be at home now. 他现在可能在家。

②The moon can’t always be full. 月亮不可能常圆。

4. 表示怀疑。只能用于一般疑问句中，带有感情色彩。如：

Can it be true? 那会是真的吗？

5. 变否定句时，直接在后面加上“not”,可缩写成can’t或cannot, 但不能写成cann’t。 如：

①He can swim.→He can’t swim.

②Emma can see the pen on the desk.→Emma cannot see the pen on the desk.

6. 变一般疑问句时，将can直接移到主语前（原主语的首字母改成小写，第一人称应变为第二人称）即可。如：

I can see an orange on the table.→Can you see an orange on the table?

其回答可用Yes. OK或Certainly等作肯定回答；用No或Sorry等作否定回答。如：

——Can you look after my books, please? 你能照看一下我的书吗？

——OK. 可以。

用Certainly回答。此时语气更为肯定。如：

——Can I see your guitar? 我能看看你的吉他吗？

——Certainly. 当然可以。

情态动词have to

have to意为“必须，不得不”，表示外界的客观要求，含有迫不得已的意味。这是一个比较特殊的情态动词，与其它的情态动词can, may, must等用法基本相同。不同之处是有人称和数的变化，否定式和疑问式的构成方式。

have to与别的情态动词一样也是后接动词原形，这是情态动词的共同特点。一般的情态动词所用的时态受到一定的限制，而且没有人称和数的变化。 have to可用于多种时态，而且不同的时态有不同的形式：一般现在时中主语为第三人称单数时，要用has to；一般过去时中，要用had to；一般将来时中，要用will have to。如：

①I have to take Bill to hospital． 我必须带比尔去医院。

②Jill has to stay in the bed when she is sick．

当吉尔有病的时候，她不得不躺在床上。

③I had to sit down and rest every five minutes．

我不得不每五分钟坐下来休息一下。

④I’ll have to take you to see a doctor if you don’t feel well．

如果你觉得不舒服的话，我将不得不带你去看病。

have to的否定式一般要借助于助动词来构成。have to， has to，had to和will have to的否定式分别为don’t have to， doesn’t have to， didn’t have to和won’t have to。它的疑问式也要用助动词的相应形式构成。如：

①——Do you have to give up eating ice cream？

你必须放弃吃冰淇淋吗？

——No， I don’t have to， but I must eat less of it．

不，我不必，但是我必须少吃一点。

②What does she have to eat and drink？她必须吃什么，喝什么？

③We won’t have to worry about them． 我们不必为他们担心。

情态动词must

must是最常用的情态动词之一，虽有词义，但不完整，不能单独在句中作谓语，必须与动词一起构成谓语，没有人称和数的变化，而且只有一种形式，表示强烈的感情。其主要用法归纳如下：

1.表示主观看法。常译为“必须、应当”。如：

①The students must obey the school rules． 学生必须遵守校规。

②We must finish our homework every day.

我们每天都必须完成作业。

2.否定形式mustn’t表示“不应该”、“不可”、“不许”的意思，给人一种不能讲任何条件和借口的感觉。如：

①You mustn’t waste your time. 你不应该浪费时间。

②You mustn’t tell her about it. 你一定不要把这事告诉她。

3.否定回答用needn’t（不必），不用mustn’t。如：

——Must I hand in my exercise today? 我必须今天交练习吗？

——No, you needn’t. 不，不必。

4.表示说话人对事物的推断，只能用于肯定句，意为“一定；准是”，比may的语气肯定得多，否定句中多用can’t。如：

①Mr Smith must be a teacher． 史密斯先生肯定是教师。

②Mr Li Yang must be over forty years old.

李阳老师一定是四十多岁了。

情态动词have to和must在用法上的区别

have to强调客观需要做的事情，即表示由于外界条件的要求而不得不去做某事；而must则强调说话者主观上应该去做某事。如：

①Mother is ill． I have to look after her at home．

妈妈病了，我不得不在家照看她。

②All of us must work hard at English．

我们大家都必须努力学习英语。

have to的否定形式不能在have后加not，而应借助于助动词do来构成。同样，其疑问形式也不可将have移到主语前，而应借助于助动词do来帮助。而must则可变化自身构成疑问和否定。且以must开头的一般疑问句，其肯定回答应用Yes，…must．其否定回答应用No，…needn’t．而不可用No，…mustn’t．。如：

①They don’t have to clean the classroom now．

他们不必现在打扫教室。

②——Must we finish our homework now？

我们必须现在完成家庭作业吗？

——Yes， you must． （No， you needn’t．）

英语情态动词的用法与探讨 篇4

英语情态动词从意义上可以分为两类,以had或may为情态动词的“建议”和以would为情态动词的.“愿望”类.这是在学习和使用英语时的难点,在学习英语过程中,解决了这一难点,就可以正确的使用英语的情态动词.

作 者：杨军  作者单位：哈尔滨理工大学公共外语教学部,黑龙江,哈尔滨,150080 刊 名：科技信息（学术版） 英文刊名：SCIENCE & TECHNOLOGY INFORMATION 年，卷(期)： “”(20) 分类号：H3 关键词：情态动词   学习过程   用法  

情态动词用法顺口溜 篇5

4.must的用法

must表示“必须”：

You must tell us the truth.

你必须给我们讲真话。

must表示推测，即“肯定、准是”，限用于肯定句：

This bag must be your sister’s.

这袋子肯定是你妹妹的

They must have done it many times.

他们肯定做过许多次了。

must表示“偏偏”

We must meet with a traffic jam when we needed to hurry up.

当我们需要赶时间的时候，偏偏遇上堵车。

Just as every family turns on their lights, the power must be cut off.

正当家人开灯时，偏偏断电了。

5.need的用法

need表示“需要”，主要用于疑问句和否定句。

Need I tell you the secret?

需要我告诉你这个秘密?

She needn’t pretend to be rich.

她不需要装阔。

You needn’t advance the date.

你们不需要把日期提前。

注意：

need也常用作实义动词。例如：

Does he need to tell lies?

他需要撒谎吗?

6.ought to的用法

ought to表示“应该”，语气比should稍重一些：

You are a grown-up now, you ought to know how to take care of yourself.

你已是大人了，应该知道如何照料自己了。

They ought not to cheat kids.

他们不应该欺骗小孩子。

ought to表示很可能的事：

They ought to be finished now.

他们应该完成了。

She ought to pass the test this time.

她这次应该能通过测试了。

7.had better的用法

had better表示“最好”，它作为情态动词没有人称或者数的变化，否定式是在better后面加not,不是在had后面加not。往往缩写成’d better，表示建议、劝告。

You had better give up smoking.

你是好戒烟。

She’d better not be proud.

情态动词复习教案 篇6

情态动词复习教案

情态动词复习教案 高考考点： 1. 情态动词主要用来表示说话人的看法、态度等， 2. 情态动词表推测 所需课时：三课时 内容讲解： 一、情态动词主要用来表示说话人的看法、态度等， 1. can (could) 1) 表示能力，could主要指过去时间。例如： ① Two eyes can see more than one. 两只眼比一只眼看得清。 ② Could the girl read before she went to school? 这女孩上学前能识字吗? 2) 表示允许。例如： ① Can I have a look at your new pen? 我可以看一看你的新钢笔吗? ② He asked whether he could take the book out of the reading―room. 他问他可不可以把书带出阅览室。 3) 表惊异、怀疑、不相信等态度。主要用于否定句、疑问句或感叹句中。例如： ① Where can (could) they have gone to? 他们会去哪儿了呢? ② How can you be so careless? 你怎么这么粗心? 4) 比较委婉客气地提出问题或陈述看法。例如： ① Can (Could) you lend me a hand? 帮我一把好吗?. ② I’m afraid we couldn’t give you an answer today. 恐怕我们今天不能给你答复。 2.may (might) 1) 表允许，might可以指过去时间，也可指现在时间，语气更委婉。例如： ① You may take whatever you like.你喜欢什么就拿什么。 ② May (Might) I ask for a photo of your baby? 我可以要一张你宝宝的照片吗? 2)在回答以may引起的问句时，多避免用这个词，而用其它方式，如Yes, please. / Certainly. / Please don’t. / You’d better not. / No, you mustn’t.等，以免显得太严峻或不客气。 3 must 表示义务。意为“必须”(主观意志)。例如： ① We must do everything step by step. 我们一切都必须循序渐进地做。 ② --Must we hand in our exercise books now?我们现在就要交练习本吗? --No, you needn’t. / No, you don’t have to. 不必。 3.shall 1) 表征询意见，用于第一、第三人称疑问句。例如： ① Shall I get you some tea? 我给你点茶好吗? ② Shall the boy wait outside? 让那男孩在外面等吗? 2) 表说话人的意愿，有“命令、允诺、警告、决心”等意思，用于第二、第三人称陈述句。 例如： ① You shall do as I say. 按我说的做。(命令) ② You shall have my answer tomorrow. 你明天可以得到我的答复。(允诺) ③ He shall be sorry for it one day, I tell you. 有一天他会后悔的，我告诉你。(警告) ④ Nothing shall stop us from carrying out the plan. 什么也不能阻止我们执行这项计划。(决心) 4.will 1) 表意愿，用于各种人称陈述句。例如： ① I will do anything for you. 我愿为你做任何事。 ② None is so blind as those who won’t see. 不愿看的人眼最瞎。 ③ If you will read the book, I’ll lend it to you. 如果你愿意读这本书，我会把它借给你。 2) 表请求，用于疑问句。例如： ① Will you close the window? 请你把窗户关上好吗? ② Won’t you drink some more coffee? 再来一点咖啡好吗? 3) 表示某种倾向或习惯性动作。例如： ① Fish will die out of water. 鱼离开水就不能活。 ② The door won’t open. 这门打不开。 5. should 1) 表义务。意为“应该”(某件事宜于做)，用于各种人称。例如： ① You should be polite to your teachers. 你对老师应该有礼貌。 ② You shouldn’t waste any time. 你不应该浪费时间。 2)(表示不确定)万一。例如： ① If I should see him, Ill tell him. 万一我见到他，我就告诉他。 ② If it should rain tomorrow, the sports meeting would be postponed. 万一明天下雨,比赛就延期举行。 6. would 1) 表意愿。例如：: ① They would not let him in because he was poorly dressed. 他们不让他进去因为他衣着破旧。 ② I said I would do anything for you. 我说过我愿意为你做任何事。 2) 表委婉地提出请求、建议或看法。例如： ① Would you mind cleaning the window? 请把窗户擦一下好吗? ② They wouldn’t have anything against it. 他们不会有什么反对意见。 3) 表过去反复发生的动作或过去的一种倾向。例如：: Every time she was in trouble, she would go to him for help. 她每遇到麻烦都会向她求助。他告诉我盒子打不开了。 7.ought to 表义务，意为“应该”(因责任、义务等该做)，口气比should稍重。例如： ① You are his father. You ought to take care of him.你是他父亲，应当管他。 ② You oughtn’t to smoke so much. 你不应该抽这么多烟。 8. used to 表示过去的习惯动作或状态，现在不复发生或存在。疑问式和否定式有两种。例如：i ① There used to be a building at the street corner, but it has been pulled down. 街道拐角处过去有座楼房，现在拆了。 ② I usedn’t (didn’t use) to smoke. 我过去不抽烟。j }F ③ Used you (Did you use) to go to school on foot? 你过去常步行去学校吗? 9.特殊情态动词need和dare的.用法： need和dare既可用作情态动词，也可用作实义动词。用作情态动词时，主要用于否定句和疑问句。用作实义动词时，可用于各种句式。 1) 用作情态动词。例如：| ① You needn’t telephone him now. 你现在不必打电话给他。 ② I don’t think you need worry. 我想你不必发愁。 ③ She dare not go out alone at night. 她晚上不敢一个人出去。 ④ How dare you say I’m unfair? 你竟敢说我不公平?_ 2) 用作实义动词。例如： ① You don’t need to do it yourself. 你不必亲自做这件事。 ② We need to tell them the news. 我们需要把这消息告诉他们。 ③ The table needs painting (to be painted.). 桌子需要油漆一下。 ④ We should dare to give our own opinion. 我们要敢于提出自己的观点。 ⑤ He did not dare (to) look up. 他不敢抬头看。 ⑥ I dare say he’ll come again. 我想他会再来的。 【注意】(I dare say…为固定习语) 二、情态动词表推测 常用表推测情态动词的用法： 1.can 表示可能(理论上或是逻辑判断上)。例如：~,>_K ① He can’t (couldn’t) have enough money for a new car. 他不可能有足够的钱买新车。 ② You mustn’t smoke while you’re walking around in the wood. You could start a fire. 在林子里走时勿吸烟，那样可能会引起火灾。 2.may 表可能(事实上)。可以指过去时间，也可以指现在时间，但语气更加不肯定。 例如： ① He may be at home. 他可能在家。 ② She may not know about it. 她可能不知道这件事。 3. must 表示揣测。意为“想必、准是、一定”等，只用于肯定句。 例如： ① He must be ill. He looks so pale. 他准是病了。他的脸色苍白。 ② She’s wearing a diamond necklace. She must have a lot of money. 她戴着钻石项链，一定很有钱。: 4. should 表推测，意为“想必一定、照说应该、估计”等。例如： ① The film should be very good as it is starring first-class actors. 这部新电影是一流演员主演的，估计拍得很好。 ② They should be home by now. 照说他们现在应当已经到家了。 5. ought to 表推测，暗含很大的可能，语气较弱。例如： ① Han Mei ought to know his telephone number. 韩梅该知道他的电话号码。 ② There’s a fine sunset; it ought to be a fine day tomorrow. 今天有晚霞，明天应该是个好天。 6. could可能性不大，语气较弱。 7 might 可能性最小，语气最弱。 备注： 表示可能性大小的顺序为： must >will >would >ought to >should >can >could>may>might 结构： 1情态动词+ 动词原形 (对现在和将来的动作进行推测) He must understand that we mean business. 2情态动词+ be +doing (对正在发生的动作进行推测) ----Where is LiLei ? ---- He may be studying at school. 3.情态动词+ have +done ( 对过去的动作进行推测) must have done 一定干了某事 could have done 可能干了某是或本可以干了某事 may/might have done 也许已经干了某事 should/ ought to have done 本应该做了某事可是没有做 need not have done 本不必干了某事 had better have done 最好干了某事 would rather have done 宁愿干了某事 would like / love have done 本想干了某事其实未干 Since the road is wet, it must have rained last night. 备注： 情态动词 + have +done 反义问句的结构由有无时间状语来决定。 Lucy must have worked last night, didn’t she? Lucy must have worked , hasn’t she? 4.情态动词+ have been + v-ing形式 (表示推测或评论过去某动作是否正在进行或一直在进行) They should have been meeting to discuss the problem. 三、情态动词其它用法 1. cannot but do sth. 表示不得不，只好 I cannot but choose to go. 2. may well +动词原形 完全能， 很可能 He may well be proud of his son. 3. may as well 最好…… We may as well stay where we are. 4 cannot ( 或neve

情态动词must的用法 篇7

1. must的意义

(1)表示责任,义务, 意为“必须”。如:

You must tell me the truth.

(2)强调语气的肯定,意为“一定要”。如:

I must ask you about your family.

(3)表示推测,意为“想必”。如:

He must be at home; the light is on.

2. must 的时态

must只有一种形式, 在将来时里,可用must, 也可用 shall(will) have to。如:

I must be at home tomorrow.

I shall have to go there some day.

must 一般不用于过去时态,它的过去式常用had to代替。如:

I had to go there yesterday.

但在下列情况下must也可用过去时:

(1)在间接引语中。如:

He said that he must talk with his teacher.

He decided that he must try to be on the side of the winner.

I said you mustn’t go there.

(2)作推测解时。如:

He must have gone to Beijing yesterday.

(3)作“偏偏”解时。如:

Just when they were about to go there, they must catch a bad cold.

3. must的否定式及其答语

(1)当must意为“必须”时否定式是needn’t。如:

You must pay the money, but you needn’t do so at once.

Must I finish my homework now?

Yes, you must./No, you needn’t.

其否定也可用don’t have to。如:

You must be back by 12 o’clock. 变为否定句应是:

You needn’t be back by 12 o’clock. 或 You don’t have to be back by 12 o’clock.

(2)当要表达“绝对不可,不许”时,其否定式是mustn’t。如:

You mustn’t do that.

You mustn’t smoke, must you?

I mustn’t let anyone know.

I must save money, mustn’t I?

(3)表示“推测”时 其否定式为can’t。如:

He must be there.

He can’t be there.

(4)——May I come in?

——No, you mustn’t.

4. must 与 have to

一般情况下可以通用。如:

You must(have to) do as you are told.

但:(1)表示主观上认为的责任或义务时用must。如:

We must try our best to do it.

(2)表示命令时用must。如:

You must answer my question in English.

(3)表示客观条件不得不如此时,用 have to。如:

He missed the bus and had to walk home.

(4)must的否定式表示“绝对不可,不许, 禁止”,have to的否定式表示“不必”。如:

You mustn’t smoke in class.

情态动词的词语分析 篇8

dare(普通动词)，dare(情态动词)

Dare的意思是敢于、冒险，它既可用作普通动词，又可作情态动词用(modal verb/auxiliary verb)。

作普通动词用时，有各种时态形式的.变化，第三人称单数现在时要加s，可以和带to或不带to的不定式连用。例如：

He dares to go to Africa alone.

他敢独自去非洲。

Does he dare to tell her?

他敢告诉她吗?

He doesnt dare(to)tell her.

他不敢告诉她。

He dared to go there.

他敢去那儿。

He didnt dare(to) take the risk.

他不敢冒这个险。

作为普通动词，dare也能表示挑战的意思。例如：

He dared me to my face.

他当面向我挑战。

作情态动词用时，一般只用于疑问句和否定句中，第三人称单数现在时不加s，无各种时态形式变化。例：

Dare he tell you the truth?

他敢不敢对你说出事实来?

He dare not tell me that sort of thing.