初中英语情态动词PPT

初中英语语法情态动词知识
can表示能力，意为“能会”
表示推测，意为“可能”，常用于否定句和疑问句中
表示请求，允许，意为“可以”
could can的过去式，意为“能、会”，
表示过去的能力，在疑问句中表示委婉请求
may表示请求、许可，意为“可以”
表示推测，常用于肯定句中，意为“可能、也许”might may的过去式
表示推测，常用于肯定句中，意为“可能、也许”must表示主观看法，意为“必须、应该”
表示有把握的推测，用语肯定句
need表示需要、必须，主要用于否定句和疑问句中dare表示敢于，主要用于否定句和疑问句中should意为“应该”，表示要求和命令
表示劝告、建议
had better意为“最好”，表示建议
used to意为“过去常常，表示过去的动作、行为。

初中英语语法大全——情态动词情态动词用来表示说话人对某一个动作成状态的看法，态度，即说话人认为某事“可能、或许、应该“发生等。

情态动词和助动词一样不能单独作谓语，后面只他跟动词原形，没有人称和数的变化。

有些情态动词有过去式，但是它们并不完表示时间上的概念，有时只是表示某种语气。

常见的情态动词如下所示:used to ①过去习惯②习惯于can/could ①能力②可能③许可④推测had better 忠告may/might ①许可②推测③能力④祝愿⑤请求need 必要will/would ①将来②意愿③提议④习惯⑤推测ought to 义务shall/should ①意志②许可、命令③法律及规则④义务dare 敢于must ①责任、义务等②意志③推测④惊讶eg: He goes to hospital.他去医院看病了。

(表示一般事实)eg: He should go to hospital. 他应当去医院着病。

eg: He should not go to hospital. 他不应当去医院看病。

一、can/could的用法1.表示可能性(1) 表示说话者主观猜测的可能性时, can/could常用于否定句和疑问句中。

could 既可以表示过去的可能性，又可以表示现在的可能性，其语气更弱一些。

Who's the man over there? Is it Mr. Black? 那边那个男人是谁?是布莱克先生吗?--- It can't be him. He's much taller.不可能是他。

他更高一些。

(表示推测时用于否定句)eg: Could he still be alive after all this time? 过了这么长时间，他还可能活着吗? (表示推测时用于疑问句)(2)can用于肯定句中时表示理论上的可能性，即从理论上看有可但实际未必会发生。

有时指一时的情况，常意为“有时会”。

初中英语复习--情态动词ltzzjr情态动词的特点：1.具有一定的意义，但不能单独作谓语其后必须跟动词原形。

2.没有人称和数的变化。

3.时态性不强，可用于过去，现在或将来 .4.可以直接构成否定或疑问。

情态动词的形式：初中要求掌握的情态动词有：can, may, must, could, should, need.一．情态动词的基本用法：can1.表示做某事的能力. “能, 能够”The little boy can sing English songs.The old man can’t carry the heavy box.2.表示允许或请求“可以”All has done. You can go home now.Can I go out with my friends tonight?may1.表示允许. “可以”=canYou may have a rest, then do it.You _____ have a rest, then do it.2.用于一般疑问句中表请求“可以”=canMay I watch TV, mum?_____I watch TV, mum?must表主观看法“必须，一定”.加not “绝不能“You must finish the work today.Boys , you mustn’t play here.could1.表过去的能力“能，会”。

He could swim when he was five.2.用于表请求的问句中代替can,语气更委婉。

Could you help me? (更委婉）Can you help me?should用于发表看法或提出建议“应该”。

In my opinion, you should do it again.You should ask you parents for advice before you do it.need”。

情态动词情态动词的特点：1.从词义的角度来看，情态动词有其自身的词汇意义，如用来表示可能、建议、愿望、必要、允许、能力、怀疑等等，以表示说话者对某种行为或状态的看法或态度。

从在谓语中的作用的角度来看，与助动词一样，情态动词在句中不能单独作句子的谓语，而必须和实义动词一起构成复合谓语。

1．最基本的情态动词有五个：can，may，must，shall和will；2．除了must以外，其他四个情态动词都有对应的一般过去式，分别是：could，might，should和would；3．这五个情态动词都有对应的情态动词短语，分别是：be able to，be allowed to，have（got）to，be supposed to/ought to和be going to。

需要注意的是，四个情态动词的过去形式could，might，would和should只是在形式上是can，may，will 和shall的过去式，而在意义上并不是完全对应于can，may，will和shall。

具体来说，一方面，现在式和过去式这两类情态动词的意义并不完全对等。

例如，can和could的意义并不完全等同，它们既有共同的用法，如表示能力，也有各自不同的用法。

另一方面，这四个过去形式的情态动词并不一定表示过去的时间（实际上通常都不是）。

情态动词的用法大致可以分为以下两大类：一类是各个情态动词有各自基本的用法，比如，can意为能够，must意为必须，should意为应该等。

常用“情态动词＋动词原形”的结构一类是表示“可能性”或“推测”，即表示人们对于某件事情发生的可能性大小所作的判断。

常用“情态动词＋动词原形”（对现在进行推测）和“情态动词＋完成式”（对过去进行推测）结构情态动词各自的基本意义及用法：1.can与could用法对比点can could1、表“能力”Can you lift this heavy box?I couldn’t understand what he said at all.2、表“许可”You can use a different materialinstead.He said I could borrow his bike.3、“怀疑”No,no,it can’t be true.What on earth can this mean?We thought the story could not be true.How could you be so careless?4、can与be able to 区别1.could代替can，表示语气更为婉转。

初中英语语法：情态动词讲解及练习情态动词讲解及练习（Modal Verbs）情态动词是初中英语里的一个重要语法项目，也是全国各省市中考试题的一个考查热点。

* 情态动词也可称为“情态助动词（Modal Auxiliaries）”，因为它和基本助动词（be,do, have）都属于助动词类。

* 情态动词和其他动词连用，可表示说话人的语气。

* 情态动词可表达建议、要求、可能和意愿等。

* 情态动词没有人称和数的变化。

* 常用的情态动词有：can, could, may, might, shall, should,will, would，must,这九大情态动词；其他的还有ought to, need, dare等。

一、九大情态动词的时态关系：1. 现在式 can -- 过去式 could2. 现在式 may -- 过去式 might3. 现在式 shall -- 过去式 should4. 现在式 will -- 过去式 would5. 现在式 must -- 过去式 must （常用had to来代替）二、情态动词表示“可能”或“预测”（can, could, will, would, shall, should, must, ought to）（1）can 和 could 用于表示“可能”或“预测”：1. He can't be at home. 他不可能在家。

（否定句）2. Can the news be true? 这消息可能是真的吗? （将情态动词can 置于主语 the news 前就成疑问句）3. Anybody can make mistake. 任何人都可能犯错误。

（只表示理论上的可能性）（2）may 和 might 用于表示“事实上的可能性”或“预测”：1. It may rain tomorrow. （表示可能会发生）明天可能会下雨。

2. It may snow later this afternoon. （表示预测）今天下午可能会下雪。

初中英语情态动词讲义全及答案一、选择题1．If you buy your mum an iRobot floor cleaner, she ________ sweep the floor every day. A．can’t B．mustn’t C．needn’t D．shouldn’t 2．Don’t cross the road until the traffic lights turn green. A car_______hit you.A．need B．may C．should D．must3．You ________ be careful with the camera. It costs!A．can B．will C．should D．may 4．—Who’s singing next door? Is it Miss Wang?—It ________ be her. She’s having the board meeting.A．can’t B．shouldn’t C．mustn’t D．needn’t 5．—Do we have to finish this today?—Yes, you ________ . Today is the last day.A．would B．may C．can D．must 6．Sorry, smoking is not allowed here. If you ________ , you will be fined according to the rules. A．can B．will C．may D．must7．—The high school entrance examination is coming!— Yes, our teacher tells us we ________ be too careful while taking exams.A．mustn’t B．shouldn’t C．needn’t D．can’t 8．—There is a knock at the door.—It ________ be my mom. She always comes back home at this time.A．may B．may not C．must D．can’t9．—Will my car be ready by the end of the day?—It ________ be, sir. I’ll call if there’s any problem.A．must B．could C．shall D．should10．We shouldn’t throw any objects from the building. Even a small object ________ cause serious injuries or death, when dropped from a great height.A．must B．should C．may D．need 11．—Dad, must we wait until the light becomes green?—Yes, I am afraid we ________. That’s the traffic rule.A．may B．can C．have to D．need12．You ________ drive after drinking alcohol(酒). It’s against the law.A．mustn’t B．needn’t C．couldn’t D．wouldn’t 13．— Mom, must I clean my room now?— No, you ________. You can do it after dinner.A．needn’t B．mustn’t C．shouldn’t D．can’t14．—________ I see your ID card? We have to check your personal information.—Sure. Here you are.A．May B．Need C．Should D．Must15．— Zoe, what do you think is the greatest advantage of shopping online?— At least I ______ spend much time going from shop to shop.A．shouldn’t B．can’t C．needn’t D．mustn’t 16．Please don't make so much noise. I ________ hear the speaker very well.A．needn't B．can't C．shouldn't D．mustn't 17．The boy is very brave．I ________ he ________ the tall tree．A．dare say; dares to climbB．dare to say; dare climbingC．dare saying; dares climbD．dare to say; dares climbed18．---Will you be back early this evening?---Yes, but I ________ be a little late. Our boss sometimes has extra work for us.A．may B．must C．need D．will19．We’ve discussed every detail of this plan and have got everything ready. But still something __________ go wrong. We still have to be very careful.A．must B．should C．would D．may 20．—Amy, I hear you've got many foreign coins．_______ I have a look?—Of course, I'll fetch them for you．A．May B．MustC．Should D．Need21．—Shall we go camping this summer holiday?—Nothing________be better.A．should B．could C．must D．may22．My bike was broken yesterday，so I____walk home．A．might B．had to C．must D．could 23．—Would you please________in that way? That’s not safe!—Sorry. I won’t do it any more.A．not driving B．not to drive C．no driving D．not drive 24．Think twice before making a decision, or you __________ get into trouble.A．may B．can't C．shouldn't D．mustn't25．I ________ hear you clearly. Would you please repeat it?A．mustn’t B．can’t C．needn’t D．shouldn’t26．I think all the students love the weekends because, to them, they ________ get up early on Saturdays or Sundays.A．mustn’t B．don’t need C．needn’t D．can’t27．—I must go to school today, ________?—No, you ________.You can go as soon as you get well.A．mustn’t I;needn’t B．needn’t I;needn’tC．mustn’t I;mustn’t D．needn’t I;mustn’t28．—How do you like my new dress?—Well, if I ________ say, it is not suitable for you.A．may B．must C．have to D．should29．— Excuse me, could you tell me where the Nanjing Brocade Museum is?— Go along this roa d for five minutes. You ________ miss it. It’s a huge building.A．mustn’t B．can’t C．needn’t D．shouldn’t 30．—Why didn’t you tell it to me earlier?— Why ________ I? I want to have my own secret.A．can B．may C．should D．shall31．A hard-working man ________ become a great scientist, but a great scientist ________ be a hard-working man.A．can’t; can B．may not; must C．can’t; must D．may not; can 32．According to the rule, used batteries ________ be dropped in the red bin for harmful wastes. A．may B．would C．should D．might33．You _________ smoke here! Look at the sign. It says "No smoking".A．needn't B．mustn't C．can D．may34．— Listen! Tom ________ be listening to the music while doing his homework.—Let’s go upstairs to remind him to turn it off.A．should B．could C．would D．must35．—Suzy described every detail of the accident just now.—Her memory ________ be completely back.A．shall B．need C．must D．could36．—Is that Mr Zhou?—It ________ be him. He has gone to Beijing.A．can B．may C．can’t D．shouldn’t37．—I think they are enough. We ________ make so many chairs.—I don’t think so. Because nearly a quarter of them need ________.A．don’t need to; mending B．needed; to be mendedC．don’t need; mend D．need; to mend38．— Mum, why do I have to wash hands so many times a day?—You ________ be too careful, for your health.A．can’t B．mustn’t C．may not D．needn’t 39．Hurry up, or we ________ miss the beginning of the film.A．should B．must C．may D．have to40．—Is it usually warm in Yancheng in May?—Yes. But it _______ be rather cold sometimes.A．must B．should C．would D．can41．—Must we stop the Japanese government discharging nuclear waste water (排放核污水) into the Pacific Ocean?—________. Because everyone should protect our earth and it is bad ________ us to eat the polluted seafood and drink the waste water.A．Yes, we can; of B．No, we mustn’t; of C．Yes, we must; for D．No, we needn’t; for42．Look at the floor, Tom! ________ you watch TV while having a meal?A．Should B．Could C．Must D．May 43．—Excuse me. I haven’t finished reading the book yet. May I keep it a bit longer?— Sorry, you ________. You must return it on time.A．needn’t B．can’t C．won’t D．shouldn’t 44．Cars ________ give way to walkers on some roads in Binhai, or the drivers will be fined. A．may B．will C．can D．must45．You’ve got a n A in the maths test again. You ________ be good at it.A．can B．may C．must D．should46．Mr. Black ________ be at home now. He went abroad on vacation last Friday.A．can’t B．mustn’t C．needn’t D．shouldn’t 47．—The article says that a person’s animal sign deci des his personality.—You ________ read it for fun, but don’t believe in that.A．can B．must C．shouldn’t D．needn’t 48．—Mum, I bought some strawberries on my way home.—Oh, you’re so sweet. But the strawberries ________ be put into the fridge for freshness. A．must B．can C．may D．need49．—In China, many students have to stay up late to do their homework.—No worries. The government has realized the problem. I’m sure there ________ be good news soon.A．can B．should C．must D．need50．Most young people like shopping online because they ________ spend much time going from shop to shop.A．needn’t B．can’t C．mustn’t D．shouldn’t【参考答案】***试卷处理标记，请不要删除一、选择题1．C解析：C【详解】句意：如果你给你妈妈买一台扫地机器人，她就不必每天扫地了。