情态动词讲解can,may,should,must,oughtto区别及用法,,练习加详解
、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：
①Two eyes can see more than one. 两只眼比一只眼看得清。
②Could the girl read before she went to school? 这女孩上学前能识字吗？因为can 不能和其他助动词连用，所以表示将来
式时用will be able to
例：You will be able to skate after you have practiced it two or three times.
注意：Can 表示一贯的能力，be able to 表示客观能力和通过努力可以达到的能力
I can ' t swim. But I am sure I will be able to swim through more practicing.
The fire spread through the hotel, but everyone was able to get out
2) 表示允许。例如：
①Can I have a look at your new pen? 我可以看一看你的新钢笔吗？
②He 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 tod恐ay怕. 我们今天不能给你答复。
Could/can+have done 结构表示对过去发生的事情的“怀疑”或“不肯定”。could 加完成式还用于肯定句时一般表过去可能完成而却未完成的动作。
Can they have won the basketball match？他们赢了那场篮球赛吗？
What you referred to just now can have made her very sad. 你刚刚所谈到的可能令他很伤心。
You could have completed the task a little earlier. 你本来能早点完成任务的。 (但事实上并没有提前完成任务)
I could have passed my examination easily but I made too many stupid mistakes. 我本可以轻易通过考试，但我犯了太多不该犯的错误。如表具体做某一件事的能力时，则须用be able to .
He was able to translate the article without a dictionary. 他可以不用词典翻译那篇文章。
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 等，以免'显t得. 太严峻或不客气。
3) may /might 推测性用法可能
He may be right. He may not come today ( 可能不) He may /might come tomorrow. 注意: (1)只用于肯定和否定句中,不用于疑问句中。
(2) might 比may 可能性更小
He might get a job. He may get a job.
（3） may no 可能不can not 不可能
He may not come . He can 't come
4）表建议（可和as well 连用）
You may（might）as well stay where you are. 你还是原地待着好。
（may as well 有―还是??的好‖的含义）
5）表祝愿
May you be happy!
6）. might 表过去的―可能‖和―允许‖多用于间接引语。
She said that he might take her dictionary. 她说他可以拿她的词典去用。
除在间接引语中外，might 一般不表示过去的“可能”与“许可”。表过去的“可能”可用could，表过去的“许可”可用were （was） allowed to。
7）might 表现在的“可能‖，其可能性要比may 小。
Electric irons could be dangerous; they might give you a severe shock.
8）may （might） + have +done 表示对过去发生行为的推测，含有―想必‖、―也许是‖的意思。
It may have been true. 这事也许是真的。He might not have settled the question. 他可能尚未解决那个问题。
3. must
1）表示义务。意为―必须‖（主观意志）。例如：
We must do everything step by step .我们必须按部就班地做一切事情。
Why must you always bother me? 为什么你偏要打扰我呢。
2）must be + 表语的结构，通常表示猜测，含有―一定‖之意。（只用在肯定句中）
He must be an honest boy.他一定是个诚实的男孩This must be your room. 这一定是你的房间。
3）must 的否定式有两个：当回答由must 引起的问题时，否定答复要用needn'或t don' t have to表示―不必‖、―无须‖、―用不着‖、―不一定‖的意义。当表示―不应该‖、―不许可‖、―禁止‖时，就用must not。
Must I go tomorrow? 明天我必须去吗？Yes, please. No , you needn ' t.
4）must +have +过去分词的结构，常用在肯定句中，表示对过去发生行为的推测，含有―一定‖、―准是‖的意
思。否定和疑问句用can。
She must have studied English before.她以前一定学过英语。
5）区别：have to 的含义与must 是很接近的,只是have to 比较强调客观需要，must 着重说明主观看法。
I must clean the room. （主观想法）I have to clean the room.（客观需要）另外，have to 能用于更多时态：
We had to be there at ten .我们得在十点钟到那里。We will have to reconsider the whole thing.
have to 的否定式：don't have to do表示―不必做??‖之意。
4. 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）
③He shall be sorry for it one day, I tell you. 有一天他会后悔的，我告诉你。（警告）
④Nothing 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）
5. should
1）用于第一人称疑问句中询问对方的意愿，但语气较委婉温和，如：
What should we do now? 我们现在该怎么办？
2）表示应该、必须，常与must 换用。例如：We should （must） master a foreign language at least.
3）（表示不确定）万一。例如：
① If I should see him, I'll 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。。。
4）― should+be表+语‖的结构，表示推测或惊奇。例如：They should be back by now. 他们现在应该回来了吧。
I am sorry that she should be so careless. 我感到遗憾她竟会那样粗心。
5）― should+have过+去分词‖的结构，表示过去该做而实际上尚未做的动作或行为；其否定则表示发生了不应该发生的行为。其同义结构―ought to have +过去分词‖表,示过去―早应该‖、―本当‖之意，语气较强。例如：
I should have thought of that. 这一点我是应当想到的。（但没想到）
They should not have left so soon. 他们不应当走得这么早。（但已走了）
6）在― It is natural （strange, natural, necessary, surprised, impossible, important ） that 句型中，主语从句中的??‖谓语动词要用should +动词原形‖表示―理所当然‖、―奇怪‖、―必要‖、―惊异‖等的意思。在les（t 以免）、for fear （that）（以防）、in case（以备万一）等之后也要用should+动词原形;在advise, sugest, order, demand, request 等的从句中should+do ‖例如：
It is necessary that he（should） be sent there at once.
It is strange that he should say so. 他会说这样的话真是奇怪。
6. will 和would 的用法
1）表示意志，决心或愿望。例如：
Surely we will support all the people in the world in their struggle for peace.
He would not let me try it . 他不肯让我去试。
2）will 表示经常性、习惯性、倾向性，would 表示过去的习惯行为。
He will sit there hour after hour looking at the traffic go by.
He would come to see me when he was in Beijing.
3）用于第二人称作主语的疑问句中，表示对对方的请求，would 的语气比will 委碗
Would/will you kindly tell me the way to the station? 请问到火车站怎么走？
4）表可能性
This will be the book you are looking for. 这可能就是你要找的书。She would be about 60 when she died.
7.ought to
表义务，意为―应该‖（因责任、义务等该做），口气比should 稍轻。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 smo kseo much. 你不应该抽这么多烟。
8. used to
1）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.
② I usedn ' t （didn ' t use） to smo我ke过. 去不抽烟。j }F
③Used you （Did you use） to go to school on foot? 你过去常步行去学校吗？
2）used to +v, be used to +v-ing和be used to +v
used to +v 意为―过去常常‖，―过去一直‖；be used to +v-ing / n （名词）意为―习惯于‖；be used to +v 意为―被用来（做某事）‖。
例：He used to smoke. Now he doesn 'Ht. e's quite used to hard work / working hard.
The knife is used to cut bread.
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：|
You needn 't telephone him now. She dare not go out alone at night. 她晚上不敢一个人出去。
2) 用作实义动词。例如：
You don ' t need to do it yourself. I dare say he 我'想ll他co会m再e 来ag(ain.I dare say 为?固定
二、情态动词表推测：
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 c他ar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。
① He may be at home. 他可能在家。② She may not know about it.
3. must 表示揣测。意为―想必、准是、一定‖等，只用于肯定句。
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.
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。表示可能性大小的顺序为：must > will > would > ought to > should > can > could> may> might
7. would rather, would sooner, would (just) as soon, had rather, had better, had sooner, can not but, may (just) as well等可用作情态动词。例如：
1)The soldier would sooner die than surrender. The brave soldier would as soon die as yield to such an enemy. I'd rather walk than take a bus.
If you don 't like to sw, iymou may just as well stay at home.
2)would (had) rather, would (had) sooner, would (just) as soon 后可跟that 引导的从句，that 常省去，从句要用虚拟语气。对现在和将来的假设用过去时，对过去的假设用过去完成时。例如：
I would rather you came on Sunday. I would sooner you hadn 't asked me to speak yesterday.
8. 表推测的情态动词句子的反意疑问句
He must/may be in the room, isn 'Het hcea?n 't be in the room, is h？e
He must have finished the work, hasn 't he? He may have done the work last night, didn 't he?
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 本不必干了某事表示过去做了某事，但没有做的必要，意为―本没必要?‖You needn 't have waken me up; I don 't have to go to work today
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：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never 等否定词)与enough 表示再??也不为过You cannot be careful enough.
情态动词练习题
1. Jack described his father, who _________ a brave boy many years ago, as a strong–willed man
A. would be
B. would have been
C. must be
D. must have been
2. _________ You buy a gift, but you can if you want to.
A. must
B. mustn't
C. have to
D. don't have to
3. I have told you the truth. _______ I keep repeating it?
A Must
B Can
C May
D Will
4. I ________ have watched that movie —it'll give me horrible dreams.
A. shouldn ' t
B. needn ' t
C. couldn ' t
D. mustn 't
5. Mark _______ have hurried. After driving at top speed, he arrived half an hour early.
A. needn ' t
B. wouldn ' t
C. mustn ' t
D. couldn ' t
6. _______ I take the book out?
—I'm afraid not.
A. Will
B. May
C. Must
D. Need
7. ______________________ Just be patient .You expect the world to change so soon .
A. can ' t
B. needn ' t
C. may not
D. whether
8. —I haven ' t got the reference book yet, but I ' ll have
a test on the subject next month.
—Don' wt orry. You ______ have it by Friday.
A. could
B. shall
C. must
D. may
9. May I take this book out of the reading room?
No, you ________ . You read it in here.
A. mightn ' t
B. won ' t
C. needn ' t
D. mustn 't
10. _________________________________________________ Doctors say that exercise is important for health, but it ____________________________________________________________________ be regular exercise.
A．can B ．will C ．must D ．may
11. ---Good morning. I've got an appointment with Miss Smith in the Personnel Department.
--Ah, good morning. You _________ be Mrs. Peters.
A. might
B. must
C. would
D. Can
12. _________ ― You have a wrong number, ‖ she said. ________ ―There ' s no one of that name here. ‖
A. need
B. can
C. must
D. would
13. ---Sorry, Professor Smith. I didn't finish the assignment yesterday.
---Oh, you ____ have done it as yesterday was the deadline.
A. must
B. mustn't
C. should
D. shouldn't
14. Bob would have helped us yesterday, but he- __________
A. was busy
B. is busy
C. had been busy.
D. will be busy
15. John went to the hospital alone. If he _________ me about it, I would have gone with him.
A. should tell
B. tells
C. told
D. had told
16. George is going to talk about the g eography of his country, but I ' d rather he ___________ more on
its culture.
A. focus
B. focused
C. would focus
D. had focused
17.If we ___ the other road, we might have arrived here in time for the meeting.
A. take
B. had taken
C. took
D. have taken
18.--The weather has been very hot and dry.
--Yes. If it had rained even a drop, things would be much better now! And my vegetables .
A. wouldn't die
B. didn't die
C. hadn't died
D. wouldn't have died
19．Had I known about this computer program, a huge amount of time and energy .
A ．would have been saved B．had been saved C.will be saved D ．was saved
20. It ' s the office! So you__ k_now eating is not allowed here. — Oh, sorry.
A. must
B. will
C. may
D. need
21. What do you mean, there are only ten tickets? There___ be twelve.
A. should
B. would
C. will
D. shall
22. — I don ' t care what people think.— Well, you __________
A. could
B. would
C. should
D. might
23.I can ' t find my purse anywhere. — You have lost it while shopping.
A.may
B.can
C.should
D.would
24.It is usually warm in my hometown in March ， but it
be rather cold sometimes.
A.must
B.can
C.should
D.would
25. — How 's your tour around the North Lake? Is it beautiful? —It _____ be ， but it is now heavily polluted.
A.will
B.would
C.should
D.must
26. ___________________________ What 's the name? Khulaifi.
27. ______________________ John ， look at the time.
you play the piano at such a late hour?
A.Must
B.Can
C.May
D.Need
28. _____________________________________________________ C atherine ，I have cleaned the room for you. — Thanks. You _____________________________________________ it.I could manage it myself.
A. needn ' t do
B. needn ' t have done
C.mustn 't do
D.shouldn ' t have done 29.I ' ll tell Mary about her new job tomorrow. — You ___________ her last week.
A.ought to tell
B.would have told
C.must tell
D.should have told
30.— Excuse me.Is this the right way to the Summer Palace?
—Sorry ，I am not sure. But it ______ be.
A.might
B.will
C.must
D.can
1. D. 考查情态动词推测用法。句意为“杰克把他的父亲描述为一个意志坚强的人，他的 父亲多
年前肯定很勇敢。 ”用 must have been 表示对过去事情的肯定推测。
2. D 情态动词 don 't have to 意为“没有必要” ，符合语境，句意为： “你没有必要买礼物， 但如果你想买的话，你也可以买。 ”
I spell that for you?
D.Might A.Shall B.Would C.Can
情态动词should的用法
情态动词should的用法 情态动词should和can ，may ，must一样，没有人称和数的变化，有词意，但都不能单独作谓语，必须和后面的动词原形一起构成谓语。基本意思是“应当，应该”，常用来表示建议或命令等。如： You should work harder. 你应该更努力地工作。 否定式和疑问式的构成与can ，may ，must一样。如： You shouldn’t play soccer in the street.你们不应该在街上踢足球。 Who should pay the taxi driver? 谁应该付出租车钱？ 注意： 常用句型You should /shouldn’t do sth 表示“建议某人（不）做某事”。其他表示“建议”的句型还有：Why not do sth? /Why don’t you do sth? /How about doing sth? /What about doing sth? /It’s a good idea to do sth /You’d better do sth等。 should作为情态动词用，常常表示意外、惊奇、不能理解等，有“竟会”的意思，例如： How should I know? 我怎么知道？ Why should you be so late today? 你今天为什么来得这么晚？ should有时表示应当做或发生的事，例如： We should help each other.我们应当互相帮助。 我们在使用时要注意以下几点： 1. 用于表示“应该”或“不应该”的概念。此时常指长辈教导或责备晚辈。例如： You should be here with clean hands. 你应该把手洗干净了再来。 2. 用于提出意见劝导别人。例如： You should go to the doctor if you feel ill. 如果你感觉不舒服，你最好去看医生。 3. 用于表示可能性。should的这一用法是考试中常常出现的考点之一。例如： We should arrive by supper time. 我们在晚饭前就能到了。 She should be here any moment. 她随时都可能来。 1. We _________ keep the new traffic law(交通法). A. may B. should C. can D. need 2.I’d like to buy a new shirt , but I don’t know __________ . A. where could buy it B. I should take which C. which I should take D. where can I get it 写出同义表达 Why not have a rest? (1) Why _______ ________ have a rest? (2) You’d _________ _________ a rest. (3) You _______ ________ a rest. (4) ________ _________ having a rest?
情态动词must用法详解
情态动词must用法详解 (1) 表示“必须” 此时可用于肯定句、否定句或疑问句，用于否定句时，mustn’t的意思是“一定不要”“不能”，而不表示“不必”。如： Water must be pure if it is to be drunk. 水如供饮用必须净化。 Must I finish the work tonight? 我必须今晚完成这项工作吗? Adverbs mustn’t be put between the verb and the object. 副词不能放在动词和宾语之间。 must主要表示现在或将来，但在间接引语中也可表过去(=had to)。如： She asked her boss if she must (had to) work overtime. 她请示上司她是否要加班。 对于must开头的一般疑问句，若作否定回答，可以用needn’t，不能用mustn’t。如：“Must I clean all the rooms?” “No, you needn’t.” “这些房间我都得清扫吗?”“不必。” (2) 表示推测 意为“准是”“一定是”，通常只用于肯定句。若用于否定句或疑问句，则用can 代之。如： That can’t be the only way. There must be other ways of solving the problem. 那不可能是解决问题的唯一办法，肯定有另外的办法。 Jane’s light is on. She must be at home. She can’t be out. 简的房间里开着灯。她一定在家，不会出去的。 若要谈论过去或完成的情况，必须用“must+have+过去分词”。如： You must have mistaken my intention. 你一定是误会了我的意图。 She must have been very young when she got married. 她结婚时一定很年轻。 He must have come this way; here are his footprints. 他一定是走这条路来的，这里还有他的脚印呢。 They must have finished their homework, for they are playing happily on the playground. 他们一定是写完作业了，他们在操场上玩得多开心呢。 (3) 表示“偏偏” 有时must可表示某事发生得不早不迟，就在某个当紧的时候，多指某些不受欢迎的事情的发生。如： The car must break down just we were starting our holidays. 我们刚刚开始休假，汽车偏偏坏了。 Must you worry her with questions, just when she is busy cooking dinner? 她正忙着做饭你干吗偏偏问她问题? Just when I was busy, the neighbor must come and chatter. 正当我忙碌的时候，邻居偏偏过来聊天。 有时还可指主观上的偏执或固执，常可译为“偏”“偏要”。如： After I gave her my advice，she must go and do the opposite. 在我给她出主意之后她偏要反着干。 Must you make so much noise? 你就非得弄出这么大的声音吗？ (4) must 与have to 的区别 两者都表示“必须”，但must 侧重于说话者的主观看法，认为有必要或有义务去做某事；have to 则重于客观需要，含有“不得不”“被迫”之意。如： Everyone must keep the law. 人人都要守法。 The last train has gone. We’ll have to walk home. 最后一班车已经开了，我们得走回家了。
情态动词can的用法及一般疑问句whatquestions
情态动词＂can“的用法 情态动词不能独立作谓语，不以人称和数量的变化而变化，后接动词原形，也就是说情态动词和动词原形一起构成谓语。我们常见的情态动词有：can，must，would等。接下来，我们就来学习一下情态动词"can"的用法。 ①表示能力，"can"译为"能；会" 例句：I can speak English. 译：我会说英语。 She can dance. 译：她会跳舞。 ②表示可能性，"can"译为"可能；会" 例句：Can you sing 译：你会唱歌吗 Can you swim 译：你会游泳吗 ③"can"用在肯定句中：主语＋can＋动词原形 例句：I can play the guitar. 译：我会弹吉他。 I can join the music club. 译：我可以加入音乐俱乐部。 ④"can"用在一般疑问句中：Can＋主语＋动词原形 肯定回答：Yes，主语＋can 否定回答：No，主语＋can't 例句：Can he play chess 译：他会下国际象棋吗 Yes,he can. 译：是的，他会。 NO,he can't. 译：不，她不会。 ⑤"can"用在否定句中：主语＋can't＋动词原形（can't 是 can not 的缩写） 例句：She can't play the piano well. 译：她弹不好钢琴。 I can't sing. 译：我不会唱歌。 ⑥"can"用在特殊疑问句中：特殊疑问词＋can＋主语＋动词原形 例句：What can you see in the room 译：在房间里你能看见什么 ⑦当特殊疑问词是句子的主语时：特殊疑问词＋can＋动词原形 例句：Who can answer my question 译：谁能回答我的问题 注意事项 "can"后一定要接动词原形。 "can" 不以人称和数量的变化而变化。
英语中情态动词can和could的用法及例句
英语中情态动词can和could的用法及例句I．情态动词can可以用来： 1．表示“能够”： Two eyes can see more than one． 两只眼睛比一只眼睛看得清楚。(谚) Can you say this in English? 你能用英文表达这个意思吗? I’m sorry I can’t help you． 戏不起我没有能力帮助你。 2．表示“可能”，“可以”： You can sit here． 你可以坐这里。 We can come over to fetch you． 我们可以过来接你。 Can I come in?
我可以进来吗? 3．（用在疑问及否定句中)表示惊异不可能等(后面有时可跟完成及进行形式)： She can’t be serious． 她不可能是当真的。 How call you be so silly? 你怎么这样傻? Where can he have gone? 他能到哪里去了呢? What can she be doing now? 她现在能在干什么呢? II．情态动词could可以用来表示： 1)能够： Nobody conld answer that question．
没人能回答那个问题。 It was so dark，we couldn’t see anything． 天那样黑我们什么也看不见。 2)可能，可以： He said he couldn’t come． 他说他不能来。 I said we could go by boat． 我说我们可以坐船去。 2．可以用来代替can，比较委婉地提出请求用法等(a)或是表示惊异不相信等(b)： a．Could you do me a favor? 你能帮我一个忙吗? We could send the parcel by air mail． 这包裹可以航空寄去。
英语人教版八年级下册一、情态动词 should的用法 情态动词should有自己
一、情态动词should的用法 情态动词should有自己的意义，但不能单独作谓语，只能和其他动词一起构成谓语，表示说话人的态度或看法，后接动词原形。常见用法有以下几点： 1.表示劝告、建议等，意为“应该”，常指根据常理认为对的事或应该去做的事。 当劝某人做或不做某事时，常用“should do sth.”或“shouldn't do sth.”。should 比must 和ought to 语气更加委婉。 例句:You should brush your teeth before you go to bed.你在睡觉前应该刷牙。 You shouldn't watch TV every day.你不应该每天看电视。 2.通常用来表示现在或将来的责任或义务。 例句:Children should obey their parents.孩子们应该听从他们的父母。 We should respect the old.我们应该尊敬老人。 3.表示推断，意为“应该；可能”。 例句:They should be there by now，I think.我觉得现在他们应该都已经到了。 4.用于第一人称疑问句，询问对方的意愿，表示说话人的一种谦
逊、客气、委婉的语气。 例句:Should I open the window? 我可以打开窗户吗？ What should we do now? 我们现在该干什么呢？ 5.表示某种感情色彩，意为“竟会”，常用于以how, why开头引导的特殊疑问句中。 例句:Why should you be so early today? 你今天为什么会如此早
初一英语：情态动词canmustmay的用法
初一英语：情态动词can-must-may的用法
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学员编号：年级：初一课时数及课时进度：学员姓名：辅导科目：英语学科教师： 学科组长/带头人签名及 日期 课题情态动词 授课时间：备课时间： 情态动词can，must，may的用法 教学目标 掌握三个情态动词的用法 重点、难点 掌握情态动词的用法并能灵活运用 考点及考试要求 教学内容 Step 1: homework checking and dictation Step 2: 情态动词 一、概念：情态动词是一种本身有一定的词义，表示说话人的情绪、态度或语气的动词，但不能单独作谓语，只能和其他动词原形构成复合谓语，没有人称和数的变化。 情态动词数量不多，但用途广泛，主要有：can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would) . 二、can/could 1. 表示能力（如体力和脑力方面），意为“能、会” Can you speak Chinese? Can you play basketball? 2. 表示请求或者允许，多用在口语中，意为“可以、能”等客观条件的允许。用于疑问句中用来提出要求，用于否定句中表示不允许。 Can you help me? You can’t play the computer 3. 表示可能，理论上的可能。 He can be out now. It can’t bu sunny all the time.
can与could的用法详解及情态动词有关习题
c a n与c o u l d的用法详解及情态动词有关习题 Company Document number：WTUT-WT88Y-W8BBGB-BWYTT-19998
can与could的用法详解 一、表示能力 (1)表示现在的能力，用can： My sister can drive. 我妹妹会开车。 Everyone here can speak English. 这儿人人会说英语。 (2)表示将来的能力，通常不用can或could，而用be able to的将来时态： I’ll be able to speak French in another few months. 再过几个月我就会讲法语了。 One day people will be able to go to the moon on holiday. 总有一天人们可以到月球上去度假。 但是，若表示现在决定将来是否有能力做某事，则可用 can： Can you come to the party tomorrow 你明天能来参加我们的聚会吗 (3)表示过去的能力，有时可用could，有时不能用could，具体应注意以下几点： ①若表示过去一般的能力(即想做某事就随时可做某事的能力)，可用could： Could you speak English then 那时候你会说英语吗 ②若表示过去的特定能力(即在过去特定场合做某事的能力)，则不能用could，而用w as (were) able to do sth，或用 managed to do sth，或用 succeeded in doing sth 等。 He studied hard and was able to pass the exam. 他学习很努力，所以考试能及格。 At last he succeeded in solving the problem. 他终于把那个问题解决了。 【注】could 不用来表示过去特定能力通常只限于肯定句，否定句或疑问句中，它则可以表示过去特定的能力： I managed to find the street, but I couldn’t find her house. 我想法找到了那条街，但没找到她的房子。(前句为肯定句用managed to，不用could，后句为否定句，可用could)另外，could还可与表示感知的动词(如see, hear, smell, taste, feel, understand等)连用表示的特定能力： Looking down from the plane, we could see lights on the runway. 从飞机上向下看，我们可以看见机场跑道上的点点灯火。 还有在中，could也可表示： He said he could see me next week. 他说他下周能见我。 二、表示许可 (1)对于现在或将来的“许可”，要区分以下两种情况： ①表示(即请求别人允许自己做某事)，两者均可用，但用could 语气更委婉： Can [Could] I come in 我可以进来吗
情态动词should的用法
should的用法： should用来提出建议和忠告，后边加动词原形，否定句直接在should后边加not. 例如：I think you should eat less junk food. 我认为你应该少吃垃圾食品。 She drives a lot and she seldom walks. So I think she should walk a lot. 她经常开车，很少走路。所以我认为她应该多走路。 Students shouldn’t sp end too much time playing computer games. 学生们不应当花太多的时间玩计算机游戏。 学习向别人提建议的几种句式： （1）I think you should… （2）Well, you could… （3）Maybe you should … （4）Why don’t you…? （5）What about doing sth.? （6）You’d better do sth. 练一练 用should或shouldn’t填空 1. I can’t sleep the night before exams. You ______ take a warm shower before you go to bed. 2. Good friends ______ argue each other. 3. There is little milk in the glass. We _______ buy some. 4. They didn’t invite you? Ma ybe you ______ be friendlier. 5. I am a little bit overweight. So I think I _______ do exercises every day. 答案：1. should 2. shouldn’t 3. should 4. should 5. should
情态动词can、must用法
情态动词can，must的用法:1. 不随着主语变化而变化；2.后跟动词原形； 1.Can 表示能，会。 1.不随着主语变化而变化； 后跟动词原形； 否定形式can not= can’t不能，不会 提can到句首，句末加“”，其肯否定回答：Yes，** can. No, ** can’t. Must，必须; 不随着主语变化而变化； 后跟动词原形； 否定形式must not = mustn’t 不允许，不准，禁止 提must到句首，句末加“”，其肯否定回答：Yes，** must. No, ** needn’t. （不，**不必）
练习题： 一．翻译 我能从墙上跳下来。 Sue 会骑自行车。 Sandy 和Sue 能打印这份信。 他们能看见那只鸟。 我必须回家。 Emma必须写作业。 我们必须从墙上跳下来。 他们必须写字。 不允许他们在街上玩。 禁止他们玩火。 二．改写句型。 1. I can sing. 改否定句: _____________ 改一般疑问句：________________ 作肯否定回答：______________________________ 划提：_____________________________ can ride a bike. 改否定句: ______________________
改一般疑问句：_____________________作肯否定回答：____________________ 划提：_____________________________ and Billy must do their homework. 改否定句: ______________________ 改一般疑问句：_____________________作肯否定回答：__________________ 划提：_____________________________ must stay at home. 改否定句: ______________________ 改一般疑问句：_____________________作肯否定回答：__________________ 划提：_____________________________ Sophie must read a novel. 改否定句: ______________________ 改一般疑问句：_____________________作肯否定回答：__________________ 划提：_____________________________ He can see that nest. 改否定句: ______________________ 改一般疑问句：_____________________作肯否定回答：__________________ 划提：_____________________________ They must listen to the stereo. 改否定句: ______________________ 改一般疑问句：_____________________作肯否定回答：__________________ 划提：_____________________________ 三．Must，mustn’t ，can ，can’t 填空 “________ I come at 6 o’clock””Oh no, you needn’t.” A blind man ________ judge colours. “May I go there””No,you_______.” Two eyes ________ see more than one. I _______ be off. Thank you very much for supper. You _______ be careful. You _______ be careless. ______ I stay up till mid-night, please The teacher _______ favour some children more than others.
情态动词must和should
must. (表示必要、命令或强制)必须,得 You mustn't talk like that. 你可不能这样说话。 You must do as you are told. 你必须遵嘱行事。 We must be home by six. 我们必须在六点以前回家。 2. (表示肯定的推测)一定是,谅必,八成 This must be your room. 这一定是你的房间了。 He must be eighty now. 他现在很可能有八十岁了。 3. (表示不可避免性)必然要,必定会 All men must die. 人总有一死。 4. (表示主张)一定要,坚持要 If you must go, at least wait till the rain stops. 如果你坚持要走,至少也要等雨停了再走。 5. (表示与说话人愿望相反)偏要 The machine must break down at this busy hour. 正忙的时候机器偏偏坏了。n.[S] 1. 必须做的事;不可少的事物 A walking stick is a must for me now. 如今我行走离不开手杖了。 2. 一定要看(或听、读)的东西 a. 1. 绝对必要的,必须的[B] Shall 1. (shall的过去式,表示过去将来)将 We hoped that we should be able to do that.我们希望我们能这样做。 2. (表示语气较强的假设)万一,竟然 If the car should break down on the way, you would have to walk back. 万一汽车中途抛锚,你就得走回来。 3. (表示可能性、推测、推论或期待)可能,该 She should be here any minute.她该马上就到。 Dinner should be ready by now.此刻晚饭应该做好了。 4. (表示义务、责任)应该,应当 You should do as she says.你应当照她说的去做。 He should work harder.应该更加努力。 You should help your mother with the housework.你应该帮你母亲做家务。 5. (表示委婉、谦逊)可,倒 6. (表示感情、意志等)竟然会;应该 I'm sorry it should be this way.很遗憾,事情竟会是这个样子。 It's strange that he should be absent.真奇怪,他竟会缺席。 You shouldn't have told him about it.你不该把这件事告诉他的。 7. (表示建议、命令、决定等)应该,必须 Crime should be punished.犯罪应受惩罚。 8. (表示目的)会,可以 He stood away so that we should enter the room first.他让开一步,让我们先进屋。 9. (表示结果、意愿等)就,该
情态动词can的用法
情态动词can 的用法： 一.定义： 情态动词是一种本身有一定的词义，他不能独立做句子的谓语，一般要和动词原形一起使用，给谓语动词增添情态色彩，表示说话人对有关行为或事物的态度和看法，认为其可能、应该或必要等。 注意：情态动词无人称和数的变化，情态动词后面跟的动词需用原形。 二．具体用法： 1. “能,会”(表示能力、功能)，即有某种能力。 Eg, I can play volleyball. 我会打排球。 He can speak English. 我会说英语。 I can be good with children. 我会和孩子们相处得好。 2. “可以”（表示允许、许可、请求)，常在口语中。 Eg，Can I have a hamburger? 可以吃一个汉堡吗？ Alice can watch TV on the weekend. 在周末Alice可以看电视。 3.表示提出邀请，或者是表示说话时的礼貌，客气，委婉。 Eg，Can I help you? / What can I do for you? 我能为你效劳吗？ Can you come to my birthday party? 你能来我的生日聚会吗？ (这样的句子在回答时肯定通常用：Y es/ Sure/ nice /great/…等回答。否定时通常用：No/ sorry, I can’t/ No, thanks…等回答。） 4.另外还可以表示推测，某种可能性，意为“可能”，常用于否定句和疑问句中，此时can’t 译为“不可能”。 5. can 的过去式是could, could 用在过去时态中。 三．Can的句型结构： 1.含有情态动词can的肯定句：can 后用动词原形do / be… “主语+ 情态动词+动词原形+其他” Eg，(1)I can play sports. 我会体育运动。 （2）She can speak Chinese. 她会说汉语。 （3）They can have lunch at school. 他们可以再学校吃午饭。 2. 含有情态动词can的否定句：在情态动词can后面加"not"。否定式为can not= can’t “主语+ 情态动词+not +动词原形+其他” Eg，（1）I can not play sports. 我不会体育运动。 （2）She can’t speak Chinese. 她不会说汉语。 （3）They can’t have lunch at school. 他们不可以在学校吃午饭。 3. 含有情态动词can的一般疑问句：把can 提到句首，句首大写C,句末问号别忘记。一般情况下，用can提问，用can回答。肯定回答用Y es,…否定回答用No,…
初中英语语法教学微课教案(情态动词can和could)
初中英语语法教学微课教案（情态动词can和could） 教学思路: 本节课我教的是情态动词can和could作“能力”解时的区别。这节课我打算通过复习以前学过的情态动词can的用法，以及通过做游戏，让学生在轻松愉快的氛围中掌握can的用法，以及了解can和could 的区别。 一、Teaching Content: Topic:Unit5Can you play the guitar? Grammar：Using “can”/ “could” to talk about ability 二、Teaching Aims: https://www.360docs.net/doc/5c7116084.html,e can talk about the ability at present. https://www.360docs.net/doc/5c7116084.html,e could talk about ability in the past. 三、Teaching Key and Difficult Points: How to use “can” and “could” to express ability in the present and past. 四、Teaching Methods: Task-Based Language Teaching Method 五、Teaching Procedures: Step 1：Warming up Task 1: Revision T: What can you do now? S1: I can sing. S2: I can draw S3: I can dance. T: Can you ride a bike / swim / fly a kite / play football / play chess? Ss:Yes , I can. / No, I can’t. Task 2: Playing a game
第17练 情态动词should的用法(原卷版)
第17练情态动词should的用法 1. As middle school students, we_____ fllw the public nules whereverwe go. A. would B. should C. might D. could 2. Ants are pretty small. You might think that they______ be rather weak. But what you might not know is that ants are actually very strong for their size. A. need B. can’t C. must 3.We don’t alow taking magazines out, butyou____ copy the article you needon the machine over there. A. can B. must C. should D. would 4. -- Mum may I go to see a film with my cousin? -- You______ go if you have finished your homework. A. must B. need C. should D. can 5.According to the notice, guests at this hotel____ _use the sports center at no extra cost. A. can B. should C. must D. need 6.---Mum, it’s too hot.__ I swim in the lake? ---No, you That’s too dangerous! A. Should; can’t B. Need; mustn’t C. Must; needn’t D. Could; mustn’t 7.- -The expeniment semns difiult. Would yourmind doing it for me? ---Why not do it by yoursel? I____ show you how to do it if necessary. A.can B. needn’t C. must D. shouldn’t 8.Dog___ run though soccer games at the park. It’s dangerous. A. should B. shouldn’t C. need D. needn’t 9.When a virus comes into our body, we get ill The same thing_____also happen to a computer. A. should B. need C. can D. must 10- Look! The man at the school gate____be our headmaster. He is always standing there to welco
情态动词must--can--could--may--might表推测的用法
情态动词must, can, could, may, might 表推测的用法： 情态动词中的must, can, could, may, might都表推测。其中must的可能性最大，can / could次之，may / might最小。具体用法如下： 1. must的用法 （1）表示推测“可能性”时，意思是“一定、准是”，语气较肯定，较有把握。 He must be American. = It is certain that he is American. 他准是个美国人。 （2）must表推测只能用于肯定句。如果要表示“一定不、肯定不”的意思时，应用can`t,如询问某种可能时，应用can。 He must know my address. 他肯定知道我的地址。（一定） He can`t know my address. 他肯定不知道我的地址。（一定不） Can he know my address? 他知道我的地址吗？（询问可能性） （3）must表示推测时，可以推测现在/正在发生的动作/过去发生的动作。 He must have a car now. （现在）他一定有辆小汽车。 He must be doing his exercises in the classroom.（正在进行）他一定在教室里做练习。 He must have finished the work.（过去发生）他一定已完成了工作。注：must表示推测时很少用于将来的情况。一般不用He must come tomorrow.可用It`s certain / I`m sure that he will come tomorrow.
情态动词can和could用法详解
情态动词can 和could 用法详解 can 和could 用法详解 1. 表示能力，could 是can 的过去。如： Can you speak English? 你会说英语吗? Could you speak English then? 那时候你会说英语吗? 2. 表示许可，注意以下用法： （1）对于现在或将来的“许可” ，要区分以下两种情况： a. 表示请求允许（即请求别人允许自己做某事），可用can（=may）或could（=might）（注意：这 里的could 并不表示过去，而是表示现在，只是语气较委婉）。如： Can [May, Could, Might] I come in? 我可以进来吗? b. 表示给予允许（即自己允许别人做某事），一般只用can（=may）， 而不能用could或might。如： A: Could [Can] I use your pen? 我可以借用你的钢笔吗? B: Yes, of course you can. 当然可以。（注意: 此处不用Yes, you could） （2）对于过去的“许可” ，也要区分以下两种情况： a. 表示过去一般性允许（即表示某人随时都可以做某事），用can的过去式（即could）。如：When I lived at home, I could watch TV whenever I wanted to. 我住在家里时，想什么时候看电影就可以什么时候看（一般性允许）。 b. 表示过去特定的允许（即表示在过去某一特定情况下允许进行某一活动），则不用could, 而需换成其它表达（如：had permission 或was [were] allowed to）。如： I was allowed to see the film yesterday evening. 昨天晚上允许我去看了电影（特定的允许，所以不能用could）。 3. 表示推测： （1）对现在或将来的推测，can 通常只用于否定句或疑问句中，一般不用于肯定句： It can't be true. 那不可能是真的。 What can they be doing? 他们会在干什么呢? Can it be Jim? 那会是吉姆吗? 但could（可以表示现在）则可用于肯定句中： We could [may, might] go to Guilin this summer. 今年夏天我们可能要去桂林。（将来可能性）You could [may, might] be right, but I don 't think you are. 你可能是对的，但我并不认为你是
must的用法及练习
情态动词must 的用法 1.must 表示必要性，“必须”（肯定句，疑问句常见） Must I start at once? 例题 你必须现在睡觉。_________________. 2.否定式mustn’t 表示“禁止” 例题 不许我们再迟到了。_________________ 3.由must 引导一般疑问句时，肯定回答用must，否定回答用 needn’t 或don’t have to. ---- Must I stay at home? ---- Yes, you ___ / No, you _________________. 4.当出现反问句式时，如果其陈述部分must 表示“必须，有必要” 时，反问句用needn’t，如果其陈述部分mustn’t 表示“禁止”，反问句用must. 例题 ① ----You must go there, ______you? ---- Yes, I must. / No, I needn’t/don’t have to. ② You mustn’t go there, _________you? 5.must 表示推测时，有3种形式时，反问句与must 后的动词保持 一致。 ⑴对现在的动作进行推测
①You must be hungry now, aren’t you? ②You must have the wrong number. There is no such person, haven’t/ don’t you? ⑵对正在进行的动作进行推测 He must be doing his homework, isn’t he？ ⑶对过去发生的动作进行推测 ① You must have read this book, haven’t you? ②It must have snowed yesterday, didn’t you? 6.must 用于反语，表示劝诫。 -----Must you make so much noise?(你非得吵这么大声吗？) -----Sorry, I’ll try not to. 例题 John, look at the time, ___ you play the piano at such a later hour? A. must B. can C. may D. need 7.与说话人的愿望相反，“偏偏，偏巧”。 友情提示：本资料代表个人观点，如有帮助请下载，谢谢您的浏览！
情态动词can的基本用法
情态动词can的基本用法： 情态动词can有一定的词义，但不能独立存在，它必须与动词原形一起构成谓语。情态动词can没有人称和数的变化。其具体用法如下： 1. 表示"能、会",指脑力或体力方面的"能力"。例如： I can speak En glish. 我会讲英语。 Jim can swim but I can't. 吉姆会游泳，但我不会。 2. 表示"可能",常用于否定句或疑问句中，指某种可能性，此时can 't译为“不可能”。例如： Han Mei ca n't be in the classroom. 韩梅不可能在教室里。 Can he come here today, please? 请问他今天能到这里来吗？ 3. 表示"可以",常用于口语中，指许可或请求做某事，可以代替 may。例如: Can I have a cup of tea, please? 请问我可以喝一杯茶吗？ You can go out. 你可以出去了。 补充：can的过去式could，意为“能、会”，表示过去的能力 女口： He could write poems when he was 10. 他十岁时就会写诗。 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？一 Could I use your pen?我能用一下你的钢笔吗？一Yes, you can.可以。（注意回答） 情态动词can的基本句型:
1. 肯定句型为：主语+can+动词原形+其它。例如： They can play basketball. 他们能打篮球。 She can dance.她会跳舞。 You can go to watch TV. 你可以去看电视了。 2. ........................... 否定句型为：主语+can not（can't/cannot）+ 动词原形+其它。表示"某人不能（不会。不可能）做其中can't是can not的缩略式，英国多写成cannot。例如： You cann ot pass the ball like this. 你不能像这样传球。 I ca n't ride a motorbike. 我不会骑摩托车。 3. 疑问句句型分为：一般疑问句句型和特殊疑问句句型两种类型。 ⑴一般疑问句句型为:Can+主语+动词原形+其它。表示"某人会（能。可以）做吗?",用于口语时，常表示请求或许可。其肯定答语用""Yes,主语+can."作答; 否定答语用"No,主语+can't."作答。注意答语中做主语的人称代词,应根据问句中的主语作相应的变化。其变化规则为：第一人称问，则第二人称答；第二人称问，则第一人称答;第三人称问，第三人称答。例如： ①-Can you sing an En glish song for us? 你可以为我们大家唱一首英语歌吗？