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【英语】英语情态动词练习题及答案及解析

【英语】英语情态动词练习题及答案及解析
【英语】英语情态动词练习题及答案及解析

【英语】英语情态动词练习题及答案及解析

一、单项选择情态动词

1.—What’s wrong with you?

—Oh, I am sick. I ________ so much ice cream just now.

A.shouldn’t eat B.mustn’t eat

C.couldn’t have eaten D.shouldn’t have eaten

【答案】D

【解析】

【详解】

考查情态动词和虚拟语气。句意:——你怎么了?——我生病了,我刚才不应该吃那么多冰激凌。A. should n’t eat不应该吃;B. mustn’t eat禁止吃;C. couldn’t have eaten不可能吃;D. shouldn’t have eaten本来不应该吃。根据just now可知,是发生在过去,故选D。

2.Our English teacher is considerate,helpful,and warm-hearted,but sometimes

she________________ be angry at our silly mistakes.

A.should B.must

C.can D.shall

【答案】C

【解析】

【详解】

考查情态动词。句意:我们的英语老师很体贴、乐于助人、热心肠,但有时她可能为我们愚蠢的错误而发火。can表示一种客观的可能性,但不一定会发生,故C项正确。

3.We’ll make the final decision on our scheme. ______ you change your mind, please inform us as soon as possible.

A.Should B.Were C.Would D.Had

【答案】A

【解析】

【分析】

【详解】

考查虚拟语气。句意:我们将对我们的计划做最后决定。如果你改变主意,请尽快通知我们。根据语境,此处用虚拟语气,表示与将来相反,从句用should+动词原形,省略if,should提前,陈述句是:If you should change your mind……。故选A。

【点睛】

虚拟语气中的倒装

当虚拟条件句中含有 were,had,should时,可以将if省略,然后将 were,had,should,移至句首:

1)If he should fail, he would kill himself.

→Should he fail, he would kill himself.

万一失败,他就会自杀。

2)If I were you, I would do it at once.

→Were I you, I would do it at once.

假若我是你,我就会马上做。

要是我能做此事,我一定会做。

3)If he had seen you yesterday, he would have asked you about it.

→Had he seen you y esterday, he would have asked you about it.

他昨天要是看到了你,他就会问你这事了。

该小题属于上述的第一种情况。should作为情态动词,有一种特殊的用法:在虚拟条件状语从句中表示与将来事实相反的虚拟语气,可以把should放在句首,即主语前,从而省略从属连词if。原来的表述为:If you should change your mind。故选A。

4.My sister met him in the street yesterday afternoon, so he ______ your lecture. A.shouldn’t have attended B.couldn’t have attended

C.mustn’t have attended D.needn’t have attended

【答案】B

【解析】

试题分析:考查情态动词用法。Shouldn’t have done本不应该做某事,实际上却做了(虚拟语气);couldn’t have done不可能做某事(对过去情况的推测);needn’t have done本不需要做某事,实际上却做了(虚拟语气);句意:我的姐姐昨天下午在街上遇见了他,所以他不可能去听了你的演讲。故B正确。

考点:考查情态动词用法

点评:考本题是高考必考考点,一定要牢记句型意思。must have done过去肯定做了某事。should have done 本应该做而实际未做。can’t have done 过去不可能做了某事;shouldn’t have done 本不应该做而实际做了。 need have done 本有必要做某事;needn’t have done 本没有必要做某事;注意没有mustn’t have done的形式。

5.—I don’t really like Janes. Why did you invite him?

—Don’t worry. He come. He said he was’t certain what his plans were.

A.must not B.need not C.would not D.might not

【答案】D

【解析】

考察情态动词,题干中的he wasn’t certain说明他可能不来,可能来,因此使用不完全否定,might not。

6.The weather turned out to be fine. I _____________ the trouble to carry the umbrella with me.

A.should have taken B.must have taken

C.couldn't have taken D.needn't have taken

【答案】D

【解析】

【详解】

考查情态动词 + have done。句意:天气转晴了。我本不必费心把伞带在身边。A. should have taken本应该做某事,而实际上没做; B. must have taken对过去发生的事情的肯定猜测;C. couldn't have taken不可能;D. needn't have taken本来不需要,故选D。

7.—Can I pay the bill by check?

—Sorry,sir.But it is the management rules of our hotel that payment _____ be made in cash.

A.shall B.need

C.will D.can

【答案】A

【解析】

【详解】

考察情态动词用法。句意:——我能用支票付账吗?——对不起,先生。但这是我们酒店的管理规定,支付要用现金。shall可以表示命令,警告,强制,或者指规则和法律要求做的事情。本题正是考察了shall表示按照规则和法律要求做的事情。故A正确。

8.It has been announced that all the students ________ put on masks before going to school in case they are infected with SARS virus.

A.shall B.will C.need D.may

【答案】A

【解析】

【详解】

【详解】

考查情态动词。句意:所有学生们应在去学校之前带上口罩以防感染非典病毒,这已经被宣布。shall用于第二、第三人称,表示说话人给对方命令、警告、允诺或威胁,故选A 项。

9.I still find it hard to imagine that such a clever child __________ make such a foolish mistake. A.shall B.must

C.can D.should

【答案】D

【解析】

【详解】

考查情态动词。句意:我仍然难以想象这样聪明的孩子竟然犯这样愚蠢的错误。should 作为情态动词,可以用来表示意外、惊喜或者在说话人看来是不可思议的,常常译为"竟会"、"居然",这么聪明的孩子竟然犯这样愚蠢的错误。表示意外,shall表示允诺,命令等,

must表示必须,can表示能力及可能性。所以答案选D。

10.—________ the woman with the baby come over? We have a seat here.

—Thank you, sir. Actually I do have my seat here. But my baby likes to look out of the window. A.Would B.Shall

C.Must D.May

【答案】A

【解析】

【详解】

考查情态动词。句意:——那位抱小孩的女士,要不来这边吧?这儿有个座位。——谢谢,实际上我有座位的,只是我的孩子喜欢看窗外。would表示婉转的请求,征求对方的意见,Shall提问一般只用于第一人称,我们常说Shall I.或者 Shall we;may表示请求对方允许。故选A。

【点睛】

would的用法

1.would 最常见的用法是:相对于一个过去时间点的后来“将要”做什么,比如:He said he would meet me at the station. 他说他会在车站接我的。这句中的 would meet 是相对于 said (过去说)之后要做的事情。又如:She thought she would have to ask someone for help. 她当时想,她得找个人帮忙。

11.The professor warned the students that on no account ________ use mobile phones in his class.

A.should they B.they should

C.dare they D.they dare

【答案】A

【解析】

【详解】

考查部分倒装和情态动词。句意:这位教授警告学生们,在他的课堂上,决不应该使用手机。on no account意为“决不”,否定词放在句首,句子使用部分倒装,排除B、D项;这里表示应该,故选A。

12.He is a bad-tempered fellow, but he ________ be quite charming when he wishes. A.shall B.should

C.can D.must

【答案】C

【解析】

【详解】

考查情态动词辨析。句意:他是个脾气不好的家伙,但当他希望自己有魅力的时候,他可以变得相当可爱。此处表示“能、可以”,故C项正确。

13.—It’s really great to have a computer to store my photos.

—Don’t count on it too much. It ________ break down and you’d better make a copy of them. A.must B.can

C.should D.will

【答案】B

【解析】

【详解】

考查情态动词。句意:——有一台计算机来储存照片真是太棒了。——不要过度依赖它。它有时候也会出故障,你最好做一个备份。计算机出故障这是可能的事情,表示客观可能性用can。must肯定,必须;should应该;will表意愿。故B选项正确。

14.—I have something important to tell John. But I can’t find him.

—His cell phone is here, so he ________ have gone too far.

A.mustn’t B.needn’t

C.wouldn’t D.can’t

【答案】D

【解析】

【详解】

考查情态动词。句意:——我有重要的事情要告诉John,但是我找不到他。——他的手机在这儿,所以他不可能走得太远。根据句意可知,此处是对过去的一种猜测,此处是表达不可能……,用can’t have done。故选D。

15.Mr. Baker, some students want to see you. ______ they wait here or outside?

A.May B.Should C.Shall D.Will

【答案】C

【解析】

【详解】

考查Shall的用法。句意:贝克先生,有些学生想见你。他们是在这里等还是在外面

等?Shall用于第一、第三人称疑问句中,表示说话人征求对方的意见或向对方请示。故选C。

【点睛】

Shall的用法

Shall作为助动词,一般用于第一人称Ⅰ和We,表示一个将来的动作,构成将来时态。Shall后面接动词原形。例如:

(1)I shall think it over and Let you know my idea.我将考虑一下此事,然后告诉你我的想法。

(2)We shall have a good time in the park.我们在公园里会玩得很高兴的。常考的特殊用法1. Shall用于第一人称,表示征求对方的意愿。如:What shall we do this evening?

2. Shall用于第一、第三人称疑问句中,表示说话人征求对方的意见或向对方请示。如:Shall we begin our lesson?When shall he be able to leave the hospital?

3. Shall用于第二、第三人称,表示说话人给对方命令、警告、允诺或威胁。如:You shall fail if you don't work harder. (警告)

He shall have the book when I finish reading. (允诺)

He shall be punished. (威胁)

16.---Can I pay the bill by credit card?

---Sorry, sir. But it is the management rules of our hotel that payment ______________ be made in cash.

A.shall B.need

C.will D.must

【答案】A

【解析】

【详解】

考查情态动词词义辨析。A. shall用于法律法规或条文中,表示义务、规定等;B. need需要;C. will会;D. must必须。句意:——我能用信用卡支付么?——对不起,先生,现金支付是我们酒店的管理规定。故A项正确。

17.—Are you going on a holiday after the exam?

—Well, I haven’t decided yet. I ________ find some other choices.

A.would B.might C.must D.should

【答案】B

【解析】

【详解】

考查情态动词辨析。句意:——考试后你要去度假吗?——嗯,我还没有决定。我可能会发现一些其他的选择。A. would将会;B. might可能;C. must必须;D. should应该。根据上文“ I haven't decided yet”可推断,我可能还有别的选择,表示可能性,might符合语境,故选B。

18.What a pity! Considering his ability and experience, he ___________ it better.

A.need have done B.must have done

C.can have done D.might have done

【答案】D

【解析】

【详解】

考查虚拟语气中的情态动词。句意:真遗憾啊!考虑到他的能力和经验,他也许可以做得更好。can have done较少使用此结构,表示对过去行为的怀疑;用于疑问句时意为“难道真的做了吗”,表示怀疑;need have done需要做某事,实际上却未做(表示虚拟语气);

must have done一定做了某事(表示对过去发生的事情的肯定推测);might have done表示对发生过的事情的推测,意思是“可能已经”或“也许已经”,用于肯定句中。故D正确。【点睛】

本题是高考必考考点,一定要牢记句型意思。must have done过去肯定做了某事。should have done本应该做而实际未做。can’t have done过去不可能做了某事;shouldn’t have done 本不应该做而实际做了。need have done本有必要做某事而没做;needn’t have done本没有必要做某事;注意没有mustn’t have done的形式。

19.We ________ take clean drinking water for granted. One day we may run out of it. A.needn't B.can't

C.won't D.shouldn't

【答案】D

【解析】

【详解】

考查情态动词。句意:我们不应该把拥有洁净的饮用水看作是理所当然的。也许有一天,我们会用完它。shouldn't“不应该”,符合句意。needn't不必;can't不可能;won't将不。故选D。

20.—Where is my dictionary?I remember I put it here yesterday.

—You___it in the wrong place.

A.must put B.should have put

C.might put D.might have put

【答案】D

【解析】

【详解】

考查情态动词。句意:——我的词典在哪里?我记得昨天放在这里了。——你或许放错了地方。“might have +动词+ed形式”表示过去可能完成的动作。根据所提供的情景Where is my dictionary? I remember I put it here yesterday.可判断出把词典放在某个地方发生在过去,所以要用“might have +动词+ed形式”。“should have + 动词+ed形式”表示“(过去)本来应该做某事”。must意为“一定”,是肯定的推测,与所提供的情景的矛盾。might put表示现在发生的事。故选D。

21.—What does the sign over there read?

—“No person___smoke or carry a lighted cigarette,cigar or pipe in this area.”

A.will B.may

C.shall D.must

【答案】C

【详解】

考查情态动词辨析。句意:---那边的牌子上写的是什么?---任何人不得在本地区吸烟或携带点燃的香烟、雪茄或烟斗。A. will表示现在的意志、愿望等,意为要,希望; B. may表示许可,或用于请求许可,意为可,可以;C. shall在陈述句中用于第二人称或第三人称,表示说话者的意志、命令、约定、决心、警告、威胁、预言等,意为必须,应该,要,得,给; D. must意为必须, 要,应当。分析句意可知,词句表示任何都不准在这个区域吸烟或携带点着的香烟、雪茄或烟斗。故选C项。

22.He ______ writing the paper now. He hadn’t written a single word when I left him te n minutes ago.

A.shouldn’t be B.can’t have finished

C.can’t be D.mustn’t have finished

【答案】B

【解析】

【详解】

考查推测句。句意:他现在不可能写完了卷子。我十分钟之前留下他时,他还没有写一个字。根据句意可知,此处考查对过去情况的否定推测,其表达为can’t have done不可能做某事,故选B项。

【点睛】

本题考查推测句

对过去情况的肯定推测是must have done

对过去情况的否定推测是can’t/couldn’t have done

例如:

The ground is wet, so it must have rained last night.

He can’t have finished his work, because he played basketball all day yesterday.

23.Tom, you _____ leave all your clothes on the floor like this!

A.wouldn’t B.mustn’t C.needn’t D.may not

【答案】B

【解析】

【详解】

考查情态动词辨析。句意:汤姆,你不要把所有的衣服都这样扔在地板上! A. wouldn’t 不会; B. mustn’t 禁止;C. needn’t不需要;D. may not不可以。本句为祈使句,所以mustn’t “禁止”符合句意。故选B项。

24.—I heard they went skiing in the mountains last winter.

—It true because there was little snow there.

A.may be not B.won’t be C.couldn’t be D.mustn’t be

【解析】

【详解】

考查情态动词辨析。句意:我听说他们去年冬天去山里滑雪。--不可能是真的,因为那里几乎没有雪。A. may be not可能不;B. won’t be 不会;C. couldn’t be不可能是;D. mustn’t be禁止。根据because there was little snow there.可知这里是否定推测,couldn’t be“不可能是”符合句意,故选C项。

25.Peter searched all the places where he________have left her iPad but it was all in vain. A.might B.would C.must D.should

【答案】A

【解析】

【详解】

考查情态动词辨析。句意:彼得找遍了所有他可能放她的iPad的地方,但都没有找到。A. might可能;B. would将会;C. must必须,一定;D. should应该。might have done表示对发生过的事情的推测,意思是“可能已经”或“也许已经”,用于肯定句中。故选A。

26.Traveling by subway ______ sometimes be quite an adventure, especially during the rush hour.

A.must B.can C.shall D.should

【答案】B

【解析】

【详解】

考查情态动词。句意:乘地铁旅行有时可能相当冒险,尤其是在交通高峰期。A. must必须;一定;B. can能够;可能;C. shall将会;D. should应该;应当。本句中can表示客观可能性(客观原因形成的能力),故选B。

27.He _____ his stay in France, didn't he? He looks amazingly different.

A.will have enjoyed B.should have enjoyed

C.can have enjoyed D.must have enjoyed

【答案】D

【解析】

【详解】

考查情态动词+have done。句意:他在法国一定过得很愉快,是吗?他看起来很不一样。must have done一定做某事。表示对过去事情的较有把握的推测。由“ He looks amazingly different.”可知,他在法国一定过得很愉快。所以这是对过去事情的较有把握的推测。故选D项。

28.--- Oh, my God! I just missed the last bus back home.

--- That’s really bad. I’m sure you ______ it, but you just didn’t hurry up.

A.had caught B.could have caught C.could catch D.can catch

【答案】B

【解析】

【详解】

考查情态动词+have done结构。句意:——哦,我的上帝!我刚好错过了回家的末班车。——这是非常糟糕的。我肯定你能赶上,但你就是不抓紧。could have done“本来能做而没有做”。故选B。

29.-- Turn off the TV, Jack. _______ your homework now?

-- Mum, just ten more minutes, please.

A.Will you be doing B.Should you be doing

C.Shouldn't you be doing D.Couldn’t you be doing

【答案】C

【解析】

【详解】

考查含情态动词的进行时态。句意:——把电视关掉,杰克。你现在不应该做作业吗?——妈妈,请再给我十分钟。此处表示目前应该在做某事,should“应该”,这里用含情态动词的进行时态,故选C。

30.---He was satisfied with the result, wasn't he?

---No. It was so difficult that he __________have passed it.

A.shouldn't B.mustn't

C.couldn' t D.wouldn't

【答案】C

【解析】

【详解】

考查情态动词。A. shouldn't 不应该;B. mustn't禁止,不允许;C. couldn' t 不可能;D. wouldn't不会。句意:---他对结果很满意,是吗? ---不。考试太难了,他不可能通过。固定结构:couldn' t have don e“不可能做某事”,此处是对过去事情有把握的否定推测。故选C。

【点睛】

情态动词+ have done结构:

1.“must + have + 过去分词”表示对过去发生的事情或状态进行推测,语气比较坚定,通常只用于肯定句.如:It must have rained last night,for the ground is wet.

2.“can / could + have + 过去分词”表示对过去某种情况的怀疑或不确定.can和could一般用于否定句和疑问句,could的语气较can弱.如:He can't have finished the work so soon.

3.“may / might + have + 过去分词”表示对已发生的动作或存在的状态进行不肯定的推

测,might的语气比may弱一点.这种结构主要用于肯定句和否定句,疑问句改用can或could.

如:They may not have known it beforehand.

4.“need + have + 过去分词”表示过去做了不必做或不需要做的事情,或过去做某事纯属多余.如:I needn't have bought so much wine—only five people came.

5.“should / ought to + have + 过去分词”表示过去本该做某事但没做,其否定式表示过去不该做某事但做了,这种句式含有不满或责备之意,ought to的语气比should强一些.如:

You ought to / should have studied harder.你本应该更努力学习的.(但没有)

He oughtn't to / shouldn't have done that.他本来就不该做那件事.(可是做了)

6.“would + have +过去分词”表示对过去的某种情况进行猜测,或本来要做某事却因某种原因未做成,通常用来说明某一情况,但不像用should或ought to那样含有责备之意.如:

I guess the poet would have been about twenty when she wrote her first poem.

Another worker wouldn't have acted like that.

31.—What happened to the young trees we planted last week?

—The trees ________ well, but I didn’t water them.

A.might grow B.needn’t have grown

C.would have grown D.would grow

【答案】C

【解析】

考查虚拟语气。——我们上周种的小树怎么了?——这些小树本来会长得很好,但是我们没有给它们浇水。根据语境可知,此处是对过去的事实进行假设,故本题选C。

32.Days later, my brother called to say he was all right, but _______say where he was. A.mustn’t B.shouldn’t C.wouldn’t D.mightn’t

【答案】C

【解析】

考查情态动词。句意:“数天后,我弟弟打电话说他很好,但不肯告诉我他在哪

里。”mustn’t“禁止”;shouldn’t“不应该”;wouldn’t“不情愿”;mightn’t“不可能”。

33.The new supermarket has announced that the first to purchase goods on the opening day ________ get a big prize.

A.must B.could

C.would D.shall

【答案】D

【解析】

【详解】

考查情态动词的用法。句意:新开业的超市宣布,开业当天首先购物的人会得到大奖。shall 用于二三人称的陈述句中可以表示说话人的承诺,命令,警告等,此处表示超市的承诺,故选D。

34.— Excuse me, could you please tell me how to get to the nearest Wenfeng Supermarket?—OK, It’s two blocks straight ahead. You ________ miss it.

A.can’t B.mustn’t

C.needn’t D.wouldn’t

【答案】A

【解析】

【详解】

考查情态动词。句意:——劳驾,你能告诉我最近的Wenfeng Supermarket怎么走吗?——好的,一直往前走两个街区就到了。你不会错过的。A. can’t不可能;B. mustn’t禁止,不允许;C. needn’t不必;D. wouldn’t不会。故选A。

35.—______ you sing and dance at this late hour of the night?

—Sorry, I will stop right now.

A.May B.Shall

C.Will D.Must

【答案】D

【解析】

试题分析:考查情态动词的用法。 May可以,可能 Shall: 用于第一三人称的疑问句,表示说话人征求对方的意见或向对方请示。?用于二三人称的陈述句表示说话人给对方的命令、警告、允诺、威胁或决心等。?用于法律、法规条文、合同等,按规定应该履行的义务等。Will 表示请求或建议;表示意愿或表示现在的习惯D. Must表示“必须”“一定”“偏要”之意。此处must表示“偏要,偏偏”。句意:——你偏要在深夜又唱又跳吗?——很抱歉,我会马上停止。

考点:考查情态动词的用法。

36.-Jenny took the 8:00 bus to Guangzhou this morning.

-Really? He__the 9:00 train. It's much more comfortable and safer to travel by train. A.could have taken B.should take

C.must have taken D.can take

【答案】A

【解析】

【详解】

考查情态动词。句意:Jenny今天早上坐8:00的客车去广州了。真的吗?她本能够坐9:00火车的,乘火车去旅游更安全舒适。情态动词加have done表示对过去的猜测,A.表本可能做了某事;B.表应该做某事;C.表过去一定做了某事D.可能,能够做某事。根据句意,此处是对过去的虚拟,故选A。

37.–Will you read me a story, Mummy?

--OK. You ______have one if you go to bed as soon as possible.

A.might B.must C.could D.shall

【答案】D

【解析】

【分析】

【详解】

考查情态动词。句意:——妈妈,给我讲个故事好吗?——好,如果你尽快上床睡觉,我就给你讲一个。might表示“或许”;must表示“必须”;could表示“可能”;shall在此处表示“允诺”,符合句意,故选择D项。

38.—Life ____ be very hard for people living in the north of Canada as it is very cold there in winter.

—Yes, the weather there _____ be as low as 60℃ below zero.

A.must; can B.shall; must C.will; should D.has to; can

【答案】A

【解析】

【详解】

考查情态动词。根据句意:——对于生活在加拿大北方的人来说生活肯定很艰难,因为冬天那儿很冷。——是的,那儿的天气可能会达到零下60度。must表肯定推测,意为“肯定,一定”,can表客观上的可能性,意为“可能”。根据语境及选项可知,A选项正确。故选A。

39.—How long shall we wait here?

—The first bus set out earlier than usual today and _____ be here any time, I think. A.should B.might C.can D.must

【答案】A

【解析】

【详解】

考查情态动词表推测。句意:—我们要在这里等多久?—首班车比往常发车的时间早了,我推测可能会在任意时间到达。should 用于表示‘事实上的可能性’或者‘推测’,多用于肯定句。故选A。

40.—I phoned you yesterday morning. A girl answered, but I didn’t recognize the voice.—Oh, it ________ my younger sister. She was in my room at that moment.

A.must have been B.should have been

C.could have been D.may have been

【答案】A

【解析】

【详解】

考查情态动词。句意:—昨天上午我给你打电话。一个女孩回答的,但我没听出谁的声音。—哦,那一定是我妹妹。她那一刻正在我的房间里。情态动词加动词的现在完成式形式,表示对过去的推测。A. must have been表示一定做了某事。用于肯定推测;B. should have been 本应该,表示应该做而没有做某事。C. could have been用于肯定句时,表示可能做了某事。更常用于否定推测;D. may have been可能做过某事。表示可能性很小。结合语境判断,表示非常肯定的推测,故选A。

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常见情态动词: 情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。 情态动词的基本用法: 一、can, could 1) 表示能力(体力、知识、技能)时,等于be able to 。 a)Can you lift this heavy box?(体力) b)Are you able to lift this heavy box? c)Mary can speak three languages.(知识) d)Is Mary able to speak three languages? e)Can you skate?(技能) 此时可用be able to代替。 2) can表示请求和允许。 -----Can I go now? ----- Yes, you can. / No, you can’t. 此时可与may互换。在疑问句中还可用could, might代替,不是过去式,只是语气更委婉,不能用于肯定句和答语中。(特别注明:这是在表示请求和允许的时候。) ---- Could I come to see you tomorrow? ---- Yes, you can. (No, I’m afraid not. ) can't在否定句中可以表示命令,不允许,但是语气比mustn't弱,具有劝慰的意思. 3)can表示“有时会”: A kind person can lose temper sometimes. 4)表示与五种感官和知觉的动词连用。 I can hear/ see you clearly from here. You can imagine how annoyed she was ! 2 / 17

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高中英语情态动词讲解

一、情态动词用法 1.情态动词的具体用法 A.能干can/could do; (经过努力)能干be able to (have the ability to do, be capable of doing) B.必须干/不得不干must / have to do; 不许干:mustn’t do C.(经允许)可以干may/ might do; 不可以干:may not do D.应该干should /ought to/ be to/ be supposed to do E.将要干will/would/shall do; (按法律,许诺,命令,威胁,第二三人称中) 将干shall do F.(某段具体时间)常干would do; (现在不做,过去常做) used to do G.宁愿做would rather do; 最好做had better do; 不妨做might as well do H.需要做need do ; 敢做dare do 2.情态动词表猜测 A.一定是must be ;一定已经干了某事must have done sth.; 一定不是can’t/couldn’t be ; 一定没干过某事can’t/couldn’t have done sth. B.可能(不)是may/might (not ) be; 可能已经(没)干某事may/might (not) have done sth. 3.情态动词与虚拟语气 A.本应该干某事(带有批评责备之意)should/ ought to have done sth.;本不该做了某事而做了shouldn’t /oughtn’t to have done sth B.本不必干某事needn’t have done sth. C.本可以干某事can/could have done sth. D.本(不会)干某事would (not) have done sth. E.真希望做过某事would like to have done sth. F.Should 在表建议的从句中: (a)It’s high time that sb. should do/did sth (b)It’s important sb. (should) do sth. (c)I suggest sb. (should ) do sth. 二、理解情态动词 Lucy is an outgoing lady. She can play many kinds of musical instruments. Actually, she could play the piano when she was 8 years old. Lucy also keeps taking exercise every day. She says that she has to do some sports because she must keep slim. “You shall get fat soon if you don’t take exercise every day.” She usually says to her friends. As for her, an elegant lady should try to keep fit. However, last week, she found that she might put on weight and she worried and decided to lose her weight. And these days she is always thinking that she may succeed soon if she tries all her best. However, she is always lack of time because she ought to take care of her children. One night after supper, she walked quickly in order to go dancing at the Tomorrow Park and she was late. On her way, she thought that the dancing must have

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