课件14张PPT。第十节情态动词情态动词从用法上来说，它有以下几个特点：
1.各个情态动词自身都有一定的词义；
2.情态动词不能在句中独立担当谓语；3.情态动词在句中不受任何人称和数的变化的影响(have to除外)；4.情态动词后接的不定式都不带 to ，即接动词原形(have to和 ought to 除外)。 英文中的情态动词主要有：can, could, may, might, must,
ought, need, dare, have to。另外，shall, will, should, would 在一定
的场合也可用作情态动词。一、can 的用法1.表示能力，意为“能，会”，否定式为 can't，过去式为could。如：—Can you dance？你会跳舞吗？—Yes, I can./No, I can't.是的，我会。/不，我不会。2.表示请求、许可，意为“可以”，此时与 may 同义。如：
Can/May I borrow your umbrella？我能借你的雨伞用吗？
3.表示客观可能性或推测，意为“可能”，常用于否定句和疑问句中。如：It can't be Mary.She has gone to the library.那不可能是玛丽，她已经去了图书馆。Can it be true？这可能是真的吗？注意：could 在下列情况时不表示过去时态：(1)提出委婉的请求时，could 比 can 客气、委婉，但在回答时不可用 could。如：—Could I have a look at the bracelet？我可以看一看这个手镯吗？—Yes, you can./No, you can't.是的，你可以。/不，不行。
(2)在否定句、疑问句中表示推测或怀疑时，相当于 might，表示“可能，也许”。如：He couldn't be a bad man.他不大可能是坏人。二、may 的用法1.表示请求、许可，意为“可以，允许”，比 can 正式，常用于肯定句、一般疑问句中。如：May I take a seat here？我可以坐这里吗？ 注意：以 May I 开头的一般疑问句的肯定回答用“Yes, you
may.”或“Yes, please.”或“Certainly./OK./Sure.”等；否定回答用“No,
you can't.”或“No, you mustn't (不可以).”或“Please don't.”等。
2.表示可能性较小或把握性不大的推测，意为“可能，也许”，常用于肯定句，有时也用于否定句。如：He may help you.他也许会帮你。三、must 的用法 1.表示“必须，应该”，在陈述句中带有有义务、有必要
的主观意愿或命令、要求的语气，在疑问句中则表示询问对方
的意见。否定式 mustn't 表示“禁止，不准，不允许”。如：I must study hard.我必须努力学习。Must I hand in my composition today ？我今天必须交作文吗？You mustn't smoke here.你不准在这儿吸烟。2.表示非常肯定的猜测，意为“一定，准是”，只用于肯定句。如：The book has John's name on it.It must be his.这本书有约翰的名字在上面，它肯定是他的。 3. 以 Must sb. 开 头 的 一 般 疑 问 句 的 肯 定 回 答 用 “Yes,
sb.must.” ； 否定回答用 “No, sb.needn't.” 或 “No, sb.don't/doesn't
have to.”。如：—Must I finish it today？今天我必须完成这项工作吗？
—No, you needn't./No, you don't have to.不，你不必/不，你没必要。四、need 的用法 need 意为“需要”，既可作情态动词，也可作实义动词。
作情态动词时多用于疑问句和否定句中，否定式为 needn't，表
示“不必”。作实义动词时，后接 to do 或名词，即：need/don't
need to do sth., need/don't need sth.；当主语是物时，用 need doing
表示被动的含义，相当于 need to be done。以 Need I 开头的一
般疑问句的肯定回答用“Yes, you must.”；否定回答用“No, you
needn't.”。如：—Need I go there？我需要去那里吗？(作情态动词)—Yes, you must./No, you needn't.是的，你必须去。/不，你没必要去。I don't need to buy a new backpack.(作实义动词)＝I needn'tbuy a new backpack.(作情态动词)我不必买新书包。The trees need watering.( 主动形式表被动) ＝The trees needto be watered.这些树需要浇水。五、should 的用法should 意为“应该”，表示义务、责任，可用于各种人称。否定式为 shouldn't。如：You shouldn't give it up.You should try your best.你不应该放弃，你应该竭尽全力。
六、had better 的用法had better 意为“最好”，否定式为 had better not，表示劝告、忠告，后接动词原形。如：You'd better not play soccer near the road.你最好不要在公路边踢球。We had better let him go.我们最好让他走吧。一、can 和 be able to can 和 be able to 表示能力时用法相同，can 只能用于一般现
在时和一般过去时(could)，没有人称和数的变化； be able to 可
用于各种时态，有人称和数的变化。如：Jim couldn't speak Chinese last year, but now he can. 吉姆去年不会说汉语，但现在他会了。We will be able to come back next week.我们下周能回来。二、can 和 may 表示可能性1.在肯定句中用 may 表示“可能”。如：You had better ask the policeman.He may know. 你最好问那个警察，他可能知道。2.在否定句中，若语气肯定，表示“不可能”时用 can't；若语气不肯定，表示“可能不”时用 may not。如：Mr.Li can't be in.He has gone to Beijing for a holiday.李老师不可能在家，他去北京度假了。三、would, should, could 和 might 表委婉语气would, should, could, might 等过去式有时不表示过去，而是表示更委婉客气的语气。如：Would you tell me the way to the park？您可以告诉我怎么去公园吗？四、must 和 have (has) to must 和 have (has) to 的意思均为“必须”，常可互换使用。
但 have (has) to 用于强调客观需要，意为“必须，不得不”；
must 用于表示主观看法，意为“必须，应该”。如：
We'll have to ask Zhang Hong instead.我们必须去问张红了。
We must work hard at school.在学校我们必须努力学习。五、may be 和 maybe may 为情态动词，后加动词原形 be，用在句中作谓语；
maybe为副词，意为“大概，也许”，相当于 perhaps，用于句首
作状语。六、can't 和 mustn't 表示否定推测时应用 can't，是“不可能”的意思；mustn't
是“禁止，不允许”的意思，不能用来表推测，而 must 在肯定
句中表推测，意为“一定”。第十节 情态动词
( )1.(2013年随州，22)—Hello, Lisa.What's the matter?
—I ________ find my mobile phone.________ you seen it?
A．couldn't; Did B．can't; Have C．need; Had D．must; Are
( )2.(2013年武汉，34)—Honey, stay home before I return.
—I ________， mum.
A．must B．can C．will D．should
( )3.(2013年孝感，30)—Look at the young lady in red.Is it Mrs.King?
—No, it ________ be her.She is wearing a white dress today.
A．can B．may C．must D．can't
( )4.(2013年宜昌，31)—Difficulties always go with me!
—Cheer up! If God closes a door in front of you, there ________ be a window opened for you.
A．would B．must C．could D．can
( )5.(2013年常州，4)—Shall I take my swimming suit?
—No, you ________.We will just go hiking on the mountain.
A．mustn't B．couldn't C．needn't D．can't
( )6.(2013年连云港，7)From March 23rd, 2013, anyone under the age of 14 ________ go into Disney's US parks alone.
A．couldn't B．mustn't C．needn't D．mightn't
( )7.(2013年梅州，35)—Amy, I hear you've got many foreign coins.________ I have a look?
—Of course, I'll fetch them for you.
A．May B．Must C．Should D．Need
( )8.(2013年广东，37)—Someone is knocking at the door.Is it Ann?
—It ________ be her.She is giving a performance at the theatre now.
A．may B．must C．can't D．mustn't
( )9.(2014年北京，27)—Must I hand in my homework now, Mr.Smith?
—No, you ________.
A．can't B．shouldn't C．wouldn't D．needn't
( )10.(2014年广东，37)—________ you come with me to Lang Lang's piano concert this evening?
—I'd love to, but I have to study for my math test.
A．Should B．May C．Must D．Can
( )1.—It's raining hard outside.You'd better ________.
—OK.
A．to go out B．going out C．not to go out D．not go out
( )2.I am afraid that I________ finish the task in such a short time.Could you help me, please?
A．can B．am going to C．am not able to D．am not going to
( )3.You ________ be late for school again next time.
A．mustn't B．needn't C．don't have to D．don't need to
( )4.—Shall we go swimming this afternoon?
—Sorry, I ________.I have lots of homework to do.
A．needn't B．mustn't C．may not D．can't
( )5.His arm is all right.He ________ go and see the doctor.
A．has not to B．don't have to C．haven't to D．doesn't have to
( )6.He had to give up the plan, ________ he?
A．did B．didn't C．does D．doesn't
( )7.He had better stay here, ________ he?
A．didn't B．don't C．hadn't D．isn't
( )8.You'd better ________ your bike ________ at once.
A．had; repaired B．have; repaired
C．had; repair D．have; repair
( )9.—Why don't you ask Mike to go with us?
—Thanks, ________.
A．I will B．I won't C．I can D．I may
( )10.—________ I take the newspaper away?
—No, you mustn't.You ________ read it only here.
A．Must; can B．May; can C．Need; must D．Must; must
( )11.Excuse me.________ you please pass me that cup?
A．Do B．Should C．Would D．Must
( )12.________ you like to have another try?
A．Could B．Will C．Would D．Do
( )13.—Would you like to go boating with us?
—Yes, ________.
A．I'd like B．I want C．I'd like to D．I do
( )14.You ________ worry about your son.He will get well soon.
A．needn't B．can't C．mustn't D．have to
( )15.The poor man needs our help, ________ he?
A．need B．needn't C．does D．doesn't
第十节 情态动词
真题·体验感悟
1—5 BCDBC 6—10 BACDD
演练·巩固提升
1—5 DCADD 6—10 BCBAB 11—15 CCCAD
