2020年高考英语语法考点讲解与真题分析专题12：情态动词(二)
2020年高考语法考点讲解与真题分析12情态动词(二)考点二表示推测的情态动词大多数情态动词都可以表示推测（即可能性）。
情态动词的这一用法要注意两个方面：一是不同情态动词可能性的大小不同；二是有些情态动词只能用于肯定句，有些只能用于否定句或疑问句，有些既可以用于肯定句，也可以用于否定句和疑问句，注意其不同含义。
常用的表示推测的情态动词可能性的大小及在不同句子中的意义见下表：can × 不可能可能吗？1. In today’s information age, the loss of data ________ cause serious problems for a company.（2018北京）A. needB. shouldC. canD. must【答案】C【解析】句意：在当今信息时代，数据的丢失可能会给企业带来严重的问题。
表示肯定推测，can意为“可能”，符合句意。
2. Although you ___ find bargains in London, it’s not generally a cheap place to shop. (2014全国)A. shouldB. needC. mustD. can【答案】D【解析】句意：虽然你在伦敦可能会找到便宜货，但是它不是便宜的购物地方。
can意为“可能，会”，表示可能性。
3. Life is unpredictable; even the poorest _______ become the richest. （2014江西）A. shallB. mustC. needD. might【答案】D【解析】句意：生活无法预测，甚至是最穷的人也可能会变成最富有的人。
might表示“有可能”，符合句意。
4. —You needn’t take an umbrella. It isn’t going to rain. (2013北京)—Well, I don’t know. It ______ do.A. mightB. needC. wouldD. should【答案】A【解析】由语境可知，这里表示非常不肯定的语气，故用might。
5. It ______ be the vocabulary that caused you the problem in the exercise because you know a lot of words.(2013安徽)A. mayB. couldn’tC. shouldD. needn’t【答案】B【解析】句意：你练习题里面的问题不可能是词汇量引起的，因为你认识很多词。
couldn’t表示否定的推测。
6. —Good morning. I’ve got an appointment with Miss Smith in the Personnel Department.— Ah, good morning. You ______ be Mrs. Peters. (2010北京)A. mightB. mustC. wouldD. can【答案】B【解析】根据语境可知，答语的意思是“你一定是彼得夫人了。
”must表示非常肯定的推测。
考点三情态动词的完成式情态动词的完成式表示对过去发生的事情的态度。
弄清楚各个情态动词的完成式的具体含义是解此类题的关键。
主要情态动词完成式的意义见下表：1.Kelly failed Mr. Brown’s literature course. She ________ have handed in the report earlier.（朝阳区2019届高三上学期期中统测）A. mightB. shouldC. wouldD. must【答案】B【解析】should表示“本来应该做但是没有做”，含有责备的口吻。
2. I can't find my purse. I_______ it in the supermarket yesterday, but I'm not sure. (2018天津)A. should leaveB. must have leftC. might leaveD. could have left【答案】D【解析】句意：我找不到我的钱包了。
我可能昨天丢在超市了，但是我不肯定。
由I'm not sure可知，应用could，must表示非常肯定的推测。
3. I ______ have worried before I came to the new school, for my classmates here are very friendly to me. (2015天津)A. mightn’tB. mustn’tC. needn’tD. couldn’t【答案】C【解析】句意：来新学校之前我本不必担心，因为同学们对我都很友好。
4. — Sorry, Mum! I failed the job interview again.—Oh, it’s too bad. You ______ have made full preparations. (2015福建)A. mustB. canC. wouldD. should【答案】D【解析】由语境可知，这里表示“本来应该做但是没有做”，是母亲对孩子的责备。
5. Since nobody gave him any help, he ______ have done the research on his own. (2013全国)A. canB. mustC. wouldD. need【答案】B【解析】句意：既然没有人帮他，他一定是独立完成研究的。
这里表示对过去发生的事情的肯定推测，应用must have done。
6. I ______ myself more—it was a perfect day. (2013浙江)A shouldn’t have enjoyedB needn’t have enjoyedC wouldn’t have enjoyedD couldn’t have enjoyed【答案】D【解析】句意：我玩得太开心了——那天天气真好。
比较级用于否定式表示最高级含义。
即：没有比这更开心的了。
7. —Why are your eyes so red? You _______ have slept well last night. (2013四川)—Yeah, I stayed up late writing a report.A. can’tB. mustn’tC. needn’tD. won’t【答案】A【解析】表示非常肯定的推测用must，否定推测用can’t。
8. I _________ to my cousin’s birthday party last night, but I was not available(2013安徽)A. wentB. had goneC. would goD. would have gone【答案】D【解析】句意：我昨晚本来要去参加我表兄弟的生日晚会，但是没能去成。
would have done表示“本来要做但是没有做”。
9. The children ______ lost in the woods; otherwise, they would have been at the lakeside camp as scheduled. (2013陕西)A. must have gotB. must getC. should have gotD. should get【答案】A【解析】表示对过去发生的事情的肯定推测，应用must have done。
10. They ______ have arrived at lunchtime but their flight was delayed. (2011全国I)A. willB. canC. mustD. should【答案】D【解析】句意：他们本来应该在午饭时间到，但是他们的航班晚点了。
should have done表示“本应该做但是没做”。
注意：may和might的完成式都表示“过去可能……”。
一般情况下，当不清楚这个可能性是否还存在时，may和might 可以互换，但当这个可能性已经不存在时，只能用might的完成式。
试比较：1. —I left my handbag on the train, but luckily someone gave it to a railway official.—How unbelievable to get it back! I mean, someone ______ it. (2011江苏)A. will have stolenB. might have stolenC. should have stolenD. must have stolen【答案】B【解析】由语境可知，这里表示“有人会把它偷走的”，表示过去的可能性，根据上句but luckily someone gave it to a railway official可知，“被偷走”这个可能性现在已经不存在了，应用might have done。
2. —I can’t find my purse anywhere.— You __________ have lost it while shopping. （2010重庆）A. mayB. canC. shouldD. would【答案】A【解析】may的完成式表示过去可能做了某事，符合语境。
这里这个可能性是否还存在还不清楚。
3. — Where is my dictionary? I remember I put it here yesterday.— You __________ it in the wrong place. （2010江西）A. must putB. should have putC. might putD. might have put【答案】D【解析】对过去的推测，要用完成式。
might的完成式表示“也许已做了”，符合句意。
这里这个可能性是否还存在还不清楚。
巩固练习：1. I got close enough to hear them speaking Chinese, and I said “Ni Hao ” just as I ____ do in China.A. mustB. mightC. canD. should【答案】B【解析】might表示“有可能”，符合句意。
高考英语新情态动词知识点知识点总复习有解析(2)
高考英语新情态动词知识点知识点总复习有解析(2)一、选择题1．—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 beenC．could have been D．may have been2．—I can’t think why he________ so angry. I mean no harm.—It’s typical of him to be sensitive(敏感的).A．should have been B．must have beenC．might have been D．can have been3．Schools have been lengthening the school day to raise test marks, which ________ be costly if schools need air conditioning on hot days.A．might B．can C．dare D．need4．His opinion was shared by Chinese director Feng Xiaogang.“Some young actors are feminine （女性化的）and they _____ be more manly,” he said during the Shanghai International Film Festival in June 2017.A．can B．must C．may D．should 5．According to the regulations, anyone who has the intention to be a teacher _______ pass a series of demanding tests.A．can B．would C．might D．shall6．—It’s so hot and uncomfortable here! Why are your windows still closed?—Oh, I’m not to blame. They ________ open.A．shan’t B．mustn’t C．won’t D．wouldn’t7．No student ______go out of school after eleven o’clock at night without the teacher’s permission.A．will B．must C．may D．shall8．--Is Jack still in hospital?--Yes. He _________ the bad food.A．wouldn’t eat B．shouldn’t eatC．wouldn’t have eaten D．shouldn’t have eaten9．I didn’t hear the phone. I ___ asleep.A．must be B．must have beenC．should be D．should have been10．—Isn’t that Ann’s husband over ther e?— No, it ________ be him —I’m sure he doesn’t wear glasses.A．must not B．can’t C．won’t D．may not11．You don’t look well, you __________ see the doctor.A．ought to B．mayC．can D．might12．I can’t thank you more, Tony. But for your timely warning, I into great trouble yesterday.A．had got B．got C．would have got D．would get 13．Mary is a bit shy and ____ a speech in public, which makes her lose the precious chance to do the voluntary job.A．dares not make B．doesn’t dare makeC．dare not to make D．dares not to make14．The heavy rain may ______ the landslide last night.A．accounts for B．accounted forC．have accounted for D．accounting for15．—You look so tired. You________ late last night.—Yes. I had to to do an important report and stayed up till I completed it.A．should sleep B．must sleepC．should have slept D．must have slept16．Louis Cha (金庸) passed away. As for his achievement, there is such a comment, “He ______ the Nobel Prize for Literature with his written works translated into English.”A．could have been rewarded B．must have been rewardedC．should be rewarded D．need have been rewarded17．She looks very happy. She_________ the exam.A．can have passed B．should have passed C．must have passed D．could have passed 18．More and more countries have come to realize that the world____ do without Huawei and its "more advanced" technology.A．can’t B．needn’t C．mustn’t D．shouldn't19．—I’m sorry, I ________ have been so rude to you that way.—Forget it, but I was a bit out of control yesterday.A．mustn’t B．shouldn’tC．couldn’t D．needn’t20．He ______ writing the paper now. He hadn’t written a single word when I left him ten minutes ago.A．shouldn’t be B．can’t have finishedC．can’t be D．mustn’t have finished21．The weather turned out to be fine yesterday. I ____________ the trouble to carry my umbrella with me.A．should have taken B．could have takenC．needn’t have taken D．mustn’t have taken22．There’s no light on --- they _______ be at home.A．can’t B．mustn’t C．needn’t D．wouldn’t23．He plays basketball very well. He_________ it a lot.A．may practise B．must practiseC．must have practised D．should have practiced24．—Do you know where Tony is?—He _________ in the living room. I saw him there just now.A．shall be B．should have been C．might have been D．must be25．Sir, you ____ be sitting in this waiting room. It is for women and children only. A．shouldn’t B．will C．won’t D．needn’t【参考答案】***试卷处理标记，请不要删除一、选择题1．A解析：A【解析】【分析】【详解】考查情态动词。
高考英语最新情态动词知识点真题汇编附解析(2)
高考英语最新情态动词知识点真题汇编附解析(2)一、选择题1．(2018·天津) I can't find my purse. I___________ it in the supermarket yesterday, but I'm not sure.A．should leave B．must have leftC．might leave D．could have left2．—I can’t think why he________ so angry. I mean no harm.—It’s typical of him to be sensitive(敏感的).A．should have been B．must have beenC．might have been D．can have been3．You ______ feel all the training a waste of time, but I'm a hundred percent sure later you'll be grateful you did it.A．may B．can C．should D．would4．If you behave well from now on, you ___ have an Apple Watch for your 18th birthday. A．will B．shall C．can D．must5．You ________ give me a lift. I want to walk home for exercise.A．needn’t B．couldn’t C．can’t D．mustn’t 6．According to the regulations, anyone who has the intention to be a teacher _______ pass a series of demanding tests.A．can B．would C．might D．shall7．-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 takeC．must have taken D．can take8．No student ______go out of school after eleven o’clock at night without the teacher’s permission.A．will B．must C．may D．shall9．--Is Jack still in hospital?--Yes. He _________ the bad food.A．wouldn’t eat B．shouldn’t eatC．wouldn’t have eaten D．shouldn’t have eaten10．—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 11．You ___________ a b etter mark, but you didn’t work hard.A．could have had B．would have had C．must have had D．must have12．I can’t thank you more, Tony. But for your timely warning, I into great trouble yesterday. A．had got B．got C．would have got D．would get 13．There are still 30 minutes ____, so we ____ hurry with lunch.A．going…needn’t B．to leave…don’t needC．leaving…needn’t to D．to go…needn’t14．Mr. White _______ to hospital for an examination yesterday but he was too busy to come. A．should come B．should have come C．should be coming D．should had come 15．Louis Cha (金庸) passed away. As for his achievement, there is such a comment, “He ______ the Nobel Prize for Literature with his written works translated into English.”A．could have been rewarded B．must have been rewardedC．should be rewarded D．need have been rewarded16．More and more countries have come to realize that the world____ do without Huawei and its "more advanced" technology.A．can’t B．needn’t C．mustn’t D．shouldn't17．—I’m sorry, I ________ have been so rude to you that way.—Forget it, but I was a bit out of control yesterday.A．mustn’t B．shouldn’tC．couldn’t D．needn’t18．(2018·北京) In today’s information age, the loss of data _________ cause serious problems for a company.A．need B．shouldC．can D．must19．You _________ me about it earlier, but you didn't.A．should have told B．would have toldC．must have told D．should tell20．Although passing the driving test ________ be difficult now, it’s worth the efforts. A．need B．shallC．can D．should21．I____________ go to a summer camp during the summer vacation, but I am not sure. A．might B．can C．must D．need22．—Do you know where Tony is?—He _________ in the living room. I saw him there just now.A．shall be B．should have been C．might have been D．must be23．It was so noisy that we hear ourselves speak.A．couldn’t B．shouldn’tC．mustn’t D．needn’t24．—May I smoke here?—If you _______, choose a seat in the smoking section.A．must B．should C．may D．can25．—Is Robert coming by coach?—He should, but he ___________ not. He likes driving his car.A．may B．could C．need D．must【参考答案】***试卷处理标记，请不要删除一、选择题1．D解析：D【解析】【详解】考查情态动词表推测。
情态动词详解
情态动词详解情态动词是英语语法中的重要组成部分，起到表达说话者的意愿、能力、可能性、推测等作用。
本文将详细解析情态动词的定义、特点和常见用法，帮助读者更好地理解和运用情态动词。
一、情态动词的定义及特点情态动词（Modal Verbs）是一类特殊的助动词，用来表达情感、态度、推测、条件、意愿、建议、能力、必要性等。
情态动词有以下几个特点：1. 情态动词没有人称和数的变化，即不论主语是第一人称、第二人称还是第三人称，情态动词的形式不变；2. 情态动词后面直接接动词原形，不加“to”；3. 情态动词没有时态和语态的变化，即不论句子时态如何，情态动词的形式不变；4. 情态动词没有完成式，因此无法在句子中出现“have + 过去分词”的结构。
二、常见情态动词及其用法下面是常见的情态动词及其用法的详细解析：1. Can“Can”表示能力、许可和可能性。
能力：用于表达某人在某方面具有的能力或技能。
例句：He can speak three languages.许可：用于征求或给予许可。
例句：Can I borrow your pen, please?可能性：用于表达可能发生的情况。
例句：It can rain tomorrow.2. Could“Could”是Can的过去式，表示过去或虚拟条件下的能力、许可和可能性。
能力（过去）：用于表达过去具备的能力或技能。
例句：When I was young, I could run very fast.许可（过去）：用于过去征求或给予许可。
例句：Could I use your phone yesterday?可能性（虚拟条件）：用于表示虚拟情况下的可能性。
例句：If I had enough money, I could travel around the world.3. May“May”表示允许、可能性、祝愿和推测。
允许：用于征求或给予许可。
例句：May I come in?可能性：用于表达主观推测的可能性。
专题12语法填空(二)——语法复习高考英语备考艺体生百日突围系列含解析
专题12 语法填空（二）——语法复习方法与知识艺体生在进行了基础知识复习之后，把重点转到：1.熟悉高考题型；2.梳理正确的做题方法和技巧；3.精选难度适中的训练题。
动词的时态和语态命题规律时态与语态一直是热点，也是广大考生复习备考的难点。
考纲要求考生应该具备较强的语言应用能力，能在具体语境中恰当、准确地使用某一特定时态；熟练掌握常见的8种时态，弄清16种时态，同时还要熟练运用特殊时态句式和用法以及不用被动式但表示被动的动词和短语。
高考对时态的考查非常灵活且难度较大，不易把握。
大部分时态题答案的选择取决于语境；但也有部分时态试题较易把握，其用法相对固定，常见于特定句式结构中；还有部分常见时态用法特殊。
时态和语态高考常考点：（1）一般现在时考点分析：①表示客观事实或普通真理（不受时态限制）。
②表示现状、性质、状态时多用系动词或状态动词；表示经常或习惯性的动作，多用动作动词，且常与表频率的时间状语连用。
③表示知觉、态度、感情、某种抽象的关系或概念的词常用一般现在时：see、hear、smell、taste、feel、notice、agree、believe、like、hate、want、think、belong seem等。
④在时间、条件状语从句中常用一般现在时代替将来时。
但要注意由if 引导的条件状语从句中可以用shall或will表“意愿”，但不表示时态。
⑤少数用于表示起止的动词如come、go、leave、arrive、fly、return、start、begin、pen、close、end、stop等常用一般现在时代替将来时，表示一个按规定、计划或安排要发生的动作。
当be表示根据时间或事先安排，肯定会出现的状态，只用一般现在时。
（2）一般过去时的考点分析：①一般过去时的基本用法：表示过去的事情、动作或状态常与表示过去具体的时间状语连用（或有上下文语境暗示）；用于表达过去的习惯；表示说话人原来没有料到、想到或希望的事通常用过去式。
高考英语情态动词知识点真题汇编含答案解析(2)
高考英语情态动词知识点真题汇编含答案解析(2)一、选择题1．AI will surely be a feature of future life, but it _____ be used responsibly and in a proper way. A．can B．need C．must D．will2．You ______ feel all the training a waste of time, but I'm a hundred percent sure later you'll be grateful you did it.A．may B．can C．should D．would3．---We want someone to design the new art museum for me.---_____ the young fellow have a try?A．Shall B．May C．Will D．Need4．Home is not just the place where you grow up. It ________ be a warm smile, a sincere hug, and a shoulder for you to cry on.A．must B．can C．will D．should5．You ________ be Carol. You haven’t changed a bit after all these years.A．must B．can C．will D．shall6．I didn’t hear the phone. I ___ asleep.A．must be B．must have beenC．should be D．should have been7．Peter searched all the places where he________have left her iPad but it was all in vain. A．might B．would C．must D．should8．It ___________ last night, for the road was very muddy.A．would have rained B．must have rained C．should have rained D．must rain 9．Although you ______ find bargains in London, it’s not generally a cheap place to shop. A．should B．need C．must D．can10．—You look so tired. You________ late last night.—Yes. I had to to do an important report and stayed up till I completed it.A．should sleep B．must sleepC．should have slept D．must have slept11．(2018·天津) I can't find my purse. I___________ it in the supermarket yesterday, but I'm not sure.A．should leave B．must have leftC．might leave D．could have left12．—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．needC．will D．can13．She looks very happy. She_________ the exam.A．can have passed B．should have passed C．must have passed D．could have passed 14．He did not regret saying what he did but felt that he _________ it differently.A．could express B．would expressC．could have expressed D．must have expressed15．The girl _________ out alone at night.A．dare not go B．dare not to go C．dares not go D．not dare go 16．Although passing the driving test ________ be difficult now, it’s worth the efforts. A．need B．shallC．can D．should17．We lost our way in that small village, otherwise we ________more places of interest yesterday.A．visited B．had visitedC．would visit D．would have visited18．—Peter, you delivered a wonderful speech today.—Thanks, but I think I ______ more attention to my stage manners during that time.A．must pay B．should payC．must have paid D．should have paid19．There’s no light on --- they _______ be at home.A．can’t B．mustn’t C．needn’t D．wouldn’t 20．Word that you _________ enjoy a three-day holiday has come if you do complete the task on time.A．may B．should C．could D．shall21．—Is there a holiday recently?—There_____ be. It has been informed that we will continue to study for another three weeks. A．won’t B．mustn’t C．may not D．can’t 22．—Sorry, Mum! I failed the job interview again.—Oh, it's too bad. You________ have made full preparations.A．must B．can C．would D．should 23．—May I smoke here?—If you _______, choose a seat in the smoking section.A．must B．should C．may D．can24．Mr. White _______ to hospital for an examination yesterday but he was too busy to come. A．should come B．should have come C．should be coming D．should had come 25．He didn’t follow the doctor’s suggestions as required, but he _________.A．ought B．ought to C．ought to be D．ought to have 【参考答案】***试卷处理标记，请不要删除一、选择题1．C解析：C【解析】【详解】考查情态动词。
高考情态动词重点讲解
高考情态动词重点讲解高考情态动词重点讲解 (一) 情态动词的语法特征情态动词主要有can, may, must, could, might, shall , should, will, would, ought to, need, dare等。
1) 情态动词不能表示正在发生或已经发生的事情，只表示期待或估计某事的发生。
2) 情态动词除ought 和have 外，后面只能接不带to 的不定式,即动词原形。
3) 情态动词没有人称，数的变化，即情态动词第三人称单数不加-s。
4) 情态动词没有非谓语形式，即没有不定式，分词等形式。
(二) 情态动词表推测1. 形式肯定的推测:must否定的推测:can’t couldn’t可能的推测:may might can could疑问的推测:can could2. 时间对过去:情态动词+完成式(have done\have been done)对正在进行:情态动词+be doing对现在或将来:情态动词+do不同的“肯定”程度可按下列层次排列:He is at home. (事实)He must be at home.(非常肯定的推断)He could be at home.(很可能)He ought to be at home.(很可能)He may be at home.(仅仅可能而已)He might be at home.(或许, 非常不确定)He might not be at home.(也许不在家)He may not be at home. (比might可能)He couldn’t be at home.(很可能不在家)He can’t be at hom e.(一定不在家)He isn't at home.(事实)(三) 高考常用情态动词辨析1. can\ could\ be able to表示能力can和be able to都表示能力(Ability)，意思上没多大区别。
高考英语情态动词知识梳理与精题分析
高考英语情态动词知识梳理与精题分析内容解读1．准确把握情态动本身的意义和用法。
包括can, may, must, will, shall, would, should, could, ought to, might, dare, need等。
2．准确把握情态动词的推测、判断用法。
3．准确把握情态动词在虚拟语气句子结构中的使用。
能力解读1．了解常见情态动词的语法特征、语义特征及相互间的区别：2．能够根据上下文的意思来确定情态动词的应用。
命题规律1．情态动词和虚拟语气在近几年高考中均是重点项目。
根据对以上各题的分析，高考的热点依次是：①推测和可能性；②"情态动词+ have done"结构；③虚拟语气；④shall, should, can 和must 表示特定语气。
2．试题的立意不偏不怪，但是有效信息越来越隐蔽，情景越来越生动、真实，考查角度越来越细微化、综合化，而这些因素都增加了试题的难度。
每年高考的单项填空部分必然有一道考查情态动词的题目，这一点是不会动摇的。
试题的特征不会有显著变化，即：立意仍将不偏不怪，情景仍将逼近真实，设问角度仍将综合化和细微化。
突破方法1．学习和掌握情态动词的意义和用法，应遵循如下步骤：①阅读语法参考书，首先从整体上把握情态动词的语法特征和语义特征；②逐个学习，了解每个情态动词的用法特征；③认真区别具有相同功能的、意思相近的情态动词的用法；④收集大量真实的口语材料（如教材中的对话材料及听力材料），在真实的实际情景中印证和领悟它们的用法特征。
2．解答情态动词类的题目时，一定要细细领会情景特征，情景中没有废话，不要放过任何细节。
只有这样，才会找到足够的有效信息，做出最佳选择。
3．一定要将上面的提到的高考热点落到实处，反复咀嚼，反复演练，确保精通。
知识梳理梳理一情态动词的类型和特征一、情态动词的类型1．只作情态动词用的有：must, can (could), may (might), ought to；2．可作情态动词也可作实义动词的有：need, dare (美语中常用作实义动词)；3．可作情态动词也可作实义动词的有：shall (should), will (would)；4．具有情态动词的某些特征的有：have (had) to, used to。
2020年高考英语语法考点讲解与真题分析专题12：情态动词(二)
2020年高考语法考点讲解与真题分析12情态动词(二)考点二表示推测的情态动词大多数情态动词都可以表示推测（即可能性）。
情态动词的这一用法要注意两个方面：一是不同情态动词可能性的大小不同；二是有些情态动词只能用于肯定句，有些只能用于否定句或疑问句，有些既可以用于肯定句，也可以用于否定句和疑问句，注意其不同含义。
常用的表示推测的情态动词可能性的大小及在不同句子中的意义见下表：can × 不可能可能吗？1. In today’s information age, the loss of data ________ cause serious problems for a company.（2018北京）A. needB. shouldC. canD. must【答案】C【解析】句意：在当今信息时代，数据的丢失可能会给企业带来严重的问题。
表示肯定推测，can意为“可能”，符合句意。
2. Although you ___ find bargains in London, it’s not generally a cheap place to shop. (2014全国)A. shouldB. needC. mustD. can【答案】D【解析】句意：虽然你在伦敦可能会找到便宜货，但是它不是便宜的购物地方。
can意为“可能，会”，表示可能性。
3. Life is unpredictable; even the poorest _______ become the richest. （2014江西）A. shallB. mustC. needD. might【答案】D【解析】句意：生活无法预测，甚至是最穷的人也可能会变成最富有的人。
might表示“有可能”，符合句意。
4. —You needn’t take an umbrella. It isn’t going to rain. (2013北京)—Well, I don’t know. It ______ do.A. mightB. needC. wouldD. should【答案】A【解析】由语境可知，这里表示非常不肯定的语气，故用might。
【高中英语】高考英语语法复习讲解：情态动词英语语法讲解
【高中英语】高考英语语法复习讲解：情态动词英语语法讲解高考英语语法复习讲解：情态动词英语语法讲解”，希望能给您带来帮助。
本文题目：高考英语语法复习讲解：情态动词英语语法讲解根据以往英语取得高分同学的经验和海文英语辅导名师的建议，他们都一致认为英语语法和词汇是学好、考好英语的重要基础，其实完形填空是对语法、词汇的综合考查，但更关键的是学好此部分有助于对英语句子结构的分析和理解，有助于学生掌握灵活多变的句式，这样不仅有助于学生做好阅读理解，而且有助于学生做好英译汉，写好作文。
因此，我们在此编写了有关重点语法的知识点，并将陆续登出，同时将刊登一些试题。
希望同学们认真掌握，切不可因不靠它们而忽视了对英语基础知识的掌握。
(一)情态动词一.情态动词的现在完成式的用法情态动词现在完成式主要有两个功能：表示已经发生的情况和表示虚拟语气。
在这两个方面must/mustn’t,;can/cann’t;need/needn’t;may/mayn’t;might/mightn’t;should/sh ouldn’t;ougtht等情态动词+完成式表示的意思是有一定区别的1.表示已经发生的情况。
1)must have+过去分词，表示对已发生情况的肯定推测，译为“(昨天)一定……”。
如：My pain apparent the moment I walked into the room, for the first man Imet asked sympathetically:” Are you feeling all right?”[A] must be [B] had been [C] must have been [D] had to be(答案为C)2)can’t / couldn’t have+过去分词，表示对已发生情况的否定推测，译为“(昨天)一定没……”。
如：Mary my letter; otherwise she would have replied before now.[A] couldn’t have received [B] ought to have received[C] has received [D] shouldn’t have received(答案为A)3)may / might have +过去分词，表示对已发生的事情做不肯定、可能性很小的推测，或事实上根本没发生，译为“也许……”。
情态动词英语语法知识精讲
情态动词英语语法知识精讲情态动词(modal verb)本身有词义，表示说话人的语气或情态，但词义不完全，不能单独用作谓语动词，一般只能和动词原形一起构成谓语动词。
小编在这里整理了相关资料，希望能帮助到您。
情态动词概述特征1)情态动词(modal verb)本身有词义，表示说话人的语气或情态，但词义不完全，不能单独用作谓语动词，一般只能和动词原形一起构成谓语动词。
2)情态动词所表示的情态有：命令、允诺、请求、拒绝、愿望、愿意、义务、必要、可能、能力、敢于、需要等。
3)情态动词(ought除外)和助动词shall，will，should，would 一样，后面的动词不定式一般皆不带。
形式变化1)没有人称和数的变化，第三人称单数的现在时也无变化。
如：I can We canYou can You canHeThey canShe canIt2)有些情态动词有过去式，有少数过去式和它的原形相同。
a)有过去式的情态动词有：may -- wouldcan ―― couldmay―― nightshall -- shouldhave to -- had tob)过去式不变的情态动词有：must - must (或had to)ought to - ought toneed---needdare - dare(亦可用dared)3)大多数情态动词后面可用动词的进行式、完成式和被动形式，如：can(may，must)be doing，can(may，must) have done，can(may，must)be done等。
否定式情态动词和助动词一样，后面可直接跟否定词not。
现将情态动词的否定式及其否定式的简略式(简略式用于口语中)列举如下：shall not--shan't [FB:nt]will not---won't [wEunt]can not-can't [kB:nt]must not-mustn't [5mQsnt]should not-- shouldn'twould not-- wouldn'tcould not-- couldn'tdare not- daren't [dZEnt]need not-- needn't在疑问句中的用法情态动词在疑问句中的用法和助动词相同。