情态动词与虚拟语气
篇1：情态动词与虚拟语气
Ⅰ. 单句语法填空
1．The only thing that I__could__do was that I wished her a long life.
解析：句意：我唯一能做的事情是希望她能长寿。所填词表示能力，此处要表达我唯一“能”做的，而且根据wished判断句子应该用一般过去时，所以填could。
2．Since you have such good preparations， there__should__not be any problem about passing the coming job interview.
解析：句意：既然你准备得很充分，通过即将到来的工作面试应该没问题。根据since提供的原因“准备充分”可以判断出，此处表示“按理说应该发生”的，故本空填情态动词should。
3．It has been accepted that all the students__shall__put on masks before going to school in case they are infected with flu virus.
解析：句意：为防止学生感染流感病毒，学生们在进校前要戴上口罩，这一点大家都已接受。在第三人称作主语的陈述句中，表示规定、规则，用shall。
4．Now I__would__like to ask you to look at some photographs if you don't mind.
解析：句意：如果你愿意的话，现在我想让你看一些照片。I would like to do...是固定句式，意为“我想做……”。
5．Anyone__can__be in a rough life time，whether he is“Bai Fumei”or“Gao Fushuai”.
解析：句意：任何人都会有困难的时候，无论他是“白富美”还是“高富帅”。此处是情态动词用于陈述句中，表示“一时的情况”，故用情态动词can。
6．(·福建，32)__Were__(be) there no modern telecommunications，we would have to wait for weeks to get news from around the world.
解析：句意：如果没有现代通信手段，我们需要等待数周才能获得来自世界各地的新闻。由句意和主句中的“would＋动词原形”可知，逗号前是一个表示与现在事实相反的从句，应为if there were...。此处条件句中的if省略，把were提到主语前，故填Were。
7．(·陕西)We would rather our daughter__stayed__(stay) at home with us， but it is her choice， and she is not a child any longer.
解析：句意：我们宁愿让女儿和我们一起待在家里，可那是她的选择，而且她也不再是个孩子了。would rather后的宾语从句要用虚拟语气，用一般过去时表示与现在或将来相反的事实。
8．(·重庆，13)It was John who broke the window. Why are you talking to me as if I__had_done__(do) it？
解析：句意：是约翰打破了窗户。你为什么以好像是我打破了的语气对我说话？as if引导的状语从句中，谓语动词与wish引导的宾语从句的虚拟语气形式相同。结合语境可知，此处表示对过去的虚拟，填had done。
9．(·石家庄二模)—What a slow bus this is！
—Yes， we__may/might__just as well walk.
解析：may/might as well不妨……。
10．(·四川，6)I still remember my happy childhood when my mother__would__(will) take me to Disneyland at weekends.
解析：句意：我仍然记得我的幸福童年，那时我母亲总会在周末带我去迪士尼乐园。would表示过去的一种习惯。
Ⅱ. 语法填空
在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
Drunk driving， a major concern currently， is not a funny thing， __1. which__ has killed many people and ruined the lives of many others. At present， traffic accidents become“the world's first harm”．
Two months ago， after __2. drinking__(drink) a lot of alcohol， my friend's uncle drove his car home. He was __3. heavily__(heavy) drunk， but he still drove home by himself. On the road near his home， an old lady was going across the road， __4. but__ his uncle didn't notice her and he was still moving on under the influence of alcohol. And __5. the__ old lady didn't see his uncle， either. In the end， the lady died.
__6. Had__ it not been for his uncle's drunkenness， the terrible accident would not have happened. If the lady __7. hadn't_died__(die)， she would live a happy life with her daughters and sons. And his uncle's home was also destroyed by his uncle. Therefore， two __8. families__(family) were destroyed.
I wish more people __9. could__(can) realize the seriousness of drunk driving and obey the traffic regulations faithfully. Always remember： refuse __10. to_drink__(drink) and drive， and give a safe world to you and me！
解析：
1．thing后是非限制性定语从句，引导词在从句中作主语，故填which。
2．after在此是介词，后跟动名词。
3．修饰was drunk用副词。
4．由didn't notice判断，该空所用词表示转折，故填but。
5．特指上文提到的lady，故填定冠词。
6．根据主句中的would not have happened判断，逗号前面是一个虚拟语气的条件句，句子的谓语应用had done形式；但是因为省略了if，所以要把had提前到句首，由此可判断出该空填Had。
7．if引导的是一个与过去事实相反的虚拟语气句子，故应用过去完成时，填hadn't died。
8．集体名词family在此是被看作整体，此处指“两个家庭”，应用其复数形式families。
9．wish后的从句用虚拟语气，此处表示与现在事实相反的情况，所以填could。
10．refuse后用动词不定式作宾语，refuse to do sth.“拒绝做某事”。
Ⅲ.单句改错
1．(·新课标Ⅱ)Some classmates suggest we can go to places of interest nearby.
答案与解析：can→should或去掉can 句意：一些同学建议我们去附近的名胜古迹。suggest作动词，表示“建议”时，宾语从句的谓语通常用虚拟语气“(should＋)动词原形”，故此处可把can改为should，也可去掉can。
2．(·新课标Ⅰ)We must found ways to protect our environment.
答案与解析：found→find 句意：我们必须要找到保护环境的方法。情态动词must后接动词原形。
3．(·湖南衡阳八中二模)It is true that no one should live without money in modern society.
答案与解析：should→can 句意：的确，在当代社会，没有钱就不能生活。根据句意可知，表示“能，能够”须用can。
4．(·山西四校模拟)But for the rain，we should have a pleasant journey yesterday.
答案与解析：have后加had 句意： 要不是下雨，我们昨天会有一次愉快的旅行。对过去的虚拟用should have done结构。
5．(·海口二模)He had telephoned to inform me of your birthday，or I would have known nothing about it.
答案与解析：去掉had or前的句子不是虚拟条件句。
篇2：情态动词与虚拟语气
情态动词是每年高考的热点也是难点，每年单项填空题必考一题。考点集中在：情态动词表示推测的基本用法及区别;情态动词否定式的用法辨析：情态动词+have done的用法区别等。
虚拟语气在高考命题中不是重点，但是难点。考点常集中在含蓄条件句以及主语、宾语从句等特定句型中虚拟语气的使用上，因此考生应熟练掌握含蓄条件句中主从句的时态要求以及一些典型句型中虚拟语气的具体形式。
虚拟语气考点透析
考点一、虚拟语气的基本用法
1.与现在事实相反的虚拟语气，基本结构为：主语+动词的一般过去时(be动词用were)+其他成分+if+should/would/could...+动词原形+其他成分。例如：
①If it were not for the fact that she ______ sing，I would invite her to the party.
A.couldnt B.shouldnt C.cant D.might not
解析 句意为：如果不是因为她不会唱歌的事实，我会邀请她来参加那次聚会的。that从句为同位语从句，描述的是事实，用陈述语气。正确答案为C。
2.与过去事实相反的虚拟语气，基本结构为：主语+动词的过去完成时+其他成分+if+should/would/could...+have done+其他成分。例如：
If the weather had been better，we could have had a picnic.But it ______ all day.
A.rained B.rains C.has rained D.is raining
解析 句意为：如果天气好的话，我们是能够去野餐的，但是下了一天的雨。句子前半部分陈述的是与过去事实相反的事情，所以用了虚拟语气。下了一天的雨是事实，所以用陈述语气。因为是发生在过去的事实，所以正确答案为A。
3.与将来事实相反的虚拟语气，基本结构为：主语+动词的一般过去时/should do/were to do+其他成分+if+should/would/could...+动词原形+其他成分。例如：
If I ______ plan to do anything I want to，Id like to go to Tibet and travel through as much of it as possible.
A.would B.could C.had to D.ought to
解析 句意为：如果我能够计划做我想做的事情，我想去西藏并且尽可能多玩一些地方。句子描述的是与将来事实相反的事情，所以正确答案为B。
考点二、含蓄虚拟条件句
这样的虚拟句不含有if从句，而是以but for/without/or/otherwise等引导的句子代替if从句，主句的谓语动词的形式与前面虚拟语气的基本用法相同。例如：
Thank you for all your hard work last week.I dont think we ______ it without you.
A.can manage B.could have managed
C.could managed D.can have managed
解析 由语境可知这里要表达的意思是：如果没有你们辛勤的工作，我们不可能处理好这件事。很显然，这是对过去发生的事实的虚拟，所以要用could have done，故应选B。
考点三、主从句时间不一致的虚拟条件句
在有些虚拟条件句中，主从句时间不一致，应根据不同情况区别对待。例如：
Its hard for me to imagine what I would be doing today if I ______ in love，at the age of seven，with the Melinda Cox Library in my hometown.
A.wouldnt have fallen B.had not fallen
C.should fall D.were to fall
解析 句意为：如果不是我在七岁时爱上家乡的Melinda Cox图书馆的话，很难想象今天的我会是什么样子。主句描述的是与现在事实相反的事情，从句描述的是与过去事实相反的事情。正确答案为B。
考点四、名词性从句中的虚拟语气
在含有表示坚持、建议、命令、要求等含义的名词性从句和在it做形式宾语或形式主语的复合句中，宾语补足语是necessary/strange/essential/natural/a pity/a shame等表示惊奇、惋惜或者理应如此等含义时，从句中的谓语动词需用should+动词原形，其中should可以省略。例如：
Dont you think it necessary that he ______ to Miami but to New York?
I agree，but the problem is ______ he has refused to.
A.will not be sent;that B.not be sent;that
C.should not be sent;what D.should not send;what
解析 问句句意为：难道你不认为必须把他送到迈阿密而不是纽约吗?句子表示理应如此的意思。正确答案为B。
情态动词考点透析
考点一、情态动词基本含义的考查
情态动词的基本含义，一直是高考考查的重要内容。例如：
1. The fire spread through the hotel very quickly but everyone______get out. A. had to B. would C. was able to D. could
解析：考查情态动词的基本含义。had to：不得不; would：表示意愿或过去常常;could倾向于表示经过长期训练而获得的能力;was able to 表示经过努力而能够做到的事或成功地做了某事。因此，答案是C。
分析：高考对情态动词基本含义的考查，仍然集中在常用的情态动词上。对常用情态动词的含义，要掌握的既准确又要全面，特别是shall, should, can, may 四个常用情态动词的含义较多，不易理解，复习时应当引起重视。
二、情态动词表示推测的考查
对情态动词表示推测的用法，是高考考查情态动词的一个重要方面。例如：
1. Sorry, Im late. I______have turned off the alarm clock and gone back to sleep again .
A. might B. should C. can D. will
解析：might have done : (过去)可能做过某事;shouldhave done :本应该做某事。根据本句提供的情境Im late 表明说话人可能把闹钟关上了。答案是：A。
分析：高考对表示推测的情态动词集中在must, can, could, may, might上，准确掌握它们使用的场合，是解决问题的关键。Must 用于肯定陈述句，表示肯定推测;can, could用于疑问或否定陈述句，表示可能性推测;may, might用于陈述句，表示可能性推测;用于否定陈述句中，cant (不可能)的语气比may not(可能不)强。此外，还要注意有对过去和对现在两种情况的推测,对过去推测用情态动词+have done ，对现在推测用情态动词+ 动词原形。
三、情态动词表示虚拟的考查
情态动词+have+过去分词表示与过去事实上相反的情况，也是高考单项选择题涉及到情态动词的一个重要方面。
1. There was a lot of fun at yesterdays party. You______come, but why didnt you?
A. must have B. should
C. need have D. ought to have
解析：ought to have done 表示本来应该做某事而实际没做，should do 表示现在应该做某事，与题中 at yesterdays party 表示的时间不一致。所以选D。
分析：高考对情态动词表示虚拟用法，表示与过去事实相反的情况。近几年高考，主要侧重should (not)have done 这一句式上，表示本来不该做却做了或本来该做却未做的事，在复习时，还应关注其它几种虚拟形式，如need (not)have done 表示本来需要做而未做或本来不需要而做的事等等，以做到有备无患。
考点四、情态动词与助动词混合考查
1.Tom ,you didnt come to the party last night?
I______, but I suddenly remembered I had homework to do .
A. had to B. didnt C. was going to D. wouldnt
解析：had to:不得不;didnt:没来;was going to：打算来;wouldnt:不愿来。句意：汤姆，昨晚你没来参加舞会吗?我本打算来，但我突然记起有作业要做。But是关键词，所以答案是：C。
2.Your phone number again? I______quite catch it .
Its 86184867.
A. didnt B. couldnt C. dont D. cant
解析：记住电话号码并非难事，未完全听清楚电话号码并非能力的事，此处只是说没有完全听清楚电话号码，所以，应选A。
【精选试题】 名校模拟题及其答案
1. I still havent thanked Aunt Lucy for her present. Its time you _____.
A. do B. did C. had D. would
2. If I hadnt been lucky enough to meet you. I really _____ what I would have done.
A. dont know B. hadnt known
C. wasnt knowing D. wouldnt know
3. Ive told everyone about it. Oh, Id rather you _____.
A. dont B. hadnt
C. couldnt D. wouldnt
4. It has been raining for a day, but eventhough it hadnt rained, we _____ there by tomorrow.
A. cant get B. wont get
C. hadnt got D. wouldnt get
5. Do you know his address? No, I also wish I _____ where he _____.
A. knew, live B. knew, lives
C. know, lives D. know, lived
6. Isnt it about time you _____ to do morning exercises? Yes, it is. Would you like to join us?
A. begin B. have begun
C. began D. had begun
7. It is hard for me to imagine what I would be doing today if I ____ in love, at the age of seven, with the Melinda Cox Library in my hometown.
A. wouldnt have fallen B. had not fallen
C. should fall D. were to fall
8. He hesitated for a moment before kicking the ball, otherwise he ____ a goal.
A. had scored B. scored
C. would score D. would have scored
9. If only he _______ quietly as the doctor instructed, he would not suffer so much now.
A. lies B. lay
C. had lain D. should lie
10. Without the air to hold some of the sunsheat, the earth at night ____ for us to live.
A. would be freezing cold B. will be freezing coldly
C. would be frozen cold D. can freeze coldly
11. I forget where I read the article, or I _____ it to you now. w.w.w.k.s.5.u.c.o.m
A. will show B. would show C. am going to show D. am showing
12. It looks as if he were drunk. So it does. _____.
A. Hed better give up drinking
B. He shouldnt have drunk so much
C. Health is more important than drink
D. I wonder why he is always doing so
13. Mary looks hot and dry So _____ you if you had so high a fever.
A. do B. are C. will D. would
14. He will come tomorrow. But Id rather he _____ the day after tomorrow.
A. will come B. is coming
C. came D. had come
15. All the doctors in the hospital insisted that he ____ badly wounded and that he ____ at once.
A. should be; be operated on
B. were; must be operated on
C. was; should be operated
D. was; be operated on
16. ______ smoking, he would not have got cancer in the lung.
A. Was he given up B. Had he given up w.w.w.k.s.5.u.c.o.m
C. Did he give D. If he gave up
17. I still havent thanked Aunt Lucy for her present. Its time you _____.
A. do B. did C. had D. would
18. Do you know his address? No, I also wish I _____ where he _____.
A. knew, live B. knew, lives w.w.w.k.s.5.u.c.o.m
C. know, lives D. know, lived
19. It is hard for me to imagine what I would be doing today if I ____ in love, at the age of seven, with the Melinda Cox Library in my hometown. w.w.w.k.s.5.u.c.o.m
A. wouldnt have fallen B. had not fallen
C. should fall D. were to fall
20. Without the air to hold some of the suns heat, the earth at night ____ for us to live.
A. would be freezing cold B. will be freezing coldly
C. would be frozen cold D. can freeze coldly
21.________ fired, your health care and other benefits will not be immediately cut off.
A. Would you be B. Should you be
C. Could you be D. Might you be
22.You cant imagine that a well-behaved gentleman _____ be so rude to a lady.
A. might B. need C. should D. would
23.Excuse me. But I want to use your computer to type a report.
You _____have my computer if you dont take care of it .
A. shant B. might not C. neednt D. shouldnt
24. He _____ have completed his work; otherwise, he wouldnt be enjoying himself by the seaside.
A. should B. must C. wouldnt D. cant
25. I ______ have been more than six years old when the accident happened.
A. shouldnt B. couldnt C. mustnt D. neednt
26. There _____ be any difficulty about passing the road test since you have practiced a lot in the driving school.
A. mustnt B. shant C. shouldnt D. neednt
27. I was on the highway when this car went past fol. Lowed by a police car. They ______ at least 150 kilometers an hour.
A. should have been doing B. must have been doing
C. could have done D. would have done
28. Ive taken someone elses green sweater by mistake.
It ______ Harrys. He always wears green.
A. has to be B. will be C. mustnt be D. could be
29. Catherine, I have cleaned the room for you.
Thanks. You ______ it. I could manage it myself.
A. neednt do B. neednt have done
C. mustnt do D. shouldnt have done
30. Lucy doesnt mind lending you her dictionary.
She _______. Ive already borrowed one.
A. cant B. mustnt C. neednt D. shouldnt
【答案与解析】
1.
【解析】选B.Its time you did 为 Its time you thanked Aunt Lucy for her present 之略。按照英语语法，its time 后从句通常要用过去式。
2.
【解析】选A.虽然前有虚拟条件句, 后有使用了虚拟语气的宾语，但 I dont know 却宜用一般现在时，因为 I dont know 表述的是现在的真实情况，句意为我要不是有幸遇到你，我真不知(指现在不知)我会做出什么蠢事来。
3.
【解析】选B.Id rather 后接从句时，从句谓语的时态规律是：用过去式表示现在或将来，用过去完成式表示过去。
4.
【解析】选A.we cant get there by tomorrow 为客观事实，故宜用陈述语气。
5.
【解析】选B.第一空填 knew，因为 I wish 后的宾语从句要用虚拟语气(即用过去式表示现在的想法);第二空要填lives，即用陈述语气，因为 where he lives 是一个客观事实，而不是 I wish 的内容。
6.
【解析】选C.Its time / Its high time / Its about time 等后接从句时，从句谓语通常用过去式。
7.
【解析】选 B.此题涉及错综时间虚拟条件句，主句与现在事实相反，条件句与过去事实相反。句意为：要不是在七岁时就迷上了 Melinda Cox 图书馆，我真不能想像我如今会在做什么。
8.
【解析】8. 选 D.这是otherwise 引出的含蓄虚拟语气，再根据前面的 hesitated 可进一步知道这是与过去事实相反的虚拟语气，由此可推知答案选 D.
9.
【解析】选 C.if only意为要是就好了，其后的句子谓语要用虚拟语气，同时根据 as the doctor instructed 中的过去时态可知从句是与过去事实相反，故选 C.
10.
【解析】选 A.without 引出的介词短语为一个与现在事实相反的含蓄条件句。
【答案】C
11.
【解析】.根据上文的语境可知句中的 or 隐含有一个虚拟的条件，即 or=if I didnt forget where I read the article(要是我没忘记我在哪儿读过这篇文章的话但事实上忘了)。
【答案】B
12.
【解析】关键信息是It looks as if he were drunk 中的虚拟语气，句子既然用了虚拟语气，也就是说，他喝醉了不是事实，只是他的言行好像是醉了，所以此题的最佳答案是D.
【答案】 D.
13.
【解析】 由于空格后的 if 条件状语从句的谓语用的是虚拟语气(这是很重要的信息)，所以主句要用 would 而不用 will，即答案应选D.
【答案】D
14.
【解析】按照英语习惯，would rather 后接that 从句时，从句谓语通常要用虚拟语气，即用过去式表示现在或将来， 用过去完成时表示过去。
【答案】C
15.
【解析】insist后的从句谓语有时用should+动词原形这样的虚拟语气，有时不用，具体要看该谓语动词所表示的含义。一般说来，若该谓语动词所表示的动作尚未发生，或尚未成为事实，则用虚拟语气;若该谓语动词所表示的动作已经发生，或已经成为事实，则要用陈述语气。分析上题的句意，可知只有选D最合适。
【答案】D
16.
【解析】是因为时态前后有矛盾。由于主句谓语是would not have got，这表明是对过去事实作出的假设，所以从句谓语应该是 had given up，而不是像D项那样用一般过去时。另外，当虚拟条件句中有 had, should, were 等词时，通常可以省略 if，并将 had, should, were 提前置于句首。
【答案】B
17.
【解析】Its time you did 为 Its time you thanked Aunt Lucy for her present 之略。按照英语语法，its time 后从句通常要用过去式。
【答案】B
18.
【解析】第一空填 knew，因为 I wish 后的宾语从句要用虚拟语气(即用过去式表示现在的想法);第二空要填lives，即用陈述语气，因为 where he lives 是一个客观事实，而不是 I wish 的内容。
【答案】B
19.
【解析】 此题涉及错综时间虚拟条件句，主句与现在事实相反，条件句与过去事实相反。句意为：要不是在七岁时就迷上了 Melinda Cox 图书馆，我真不能想像我如今会在做什么。
【答案】B
20.
【解析】without 引出的介词短语为一个与现在事实相反的含蓄条件句。
【答案】A
21.
【解析】句意：万一你被解雇，给你的医疗救助和其它方面的福利也不会被取消。
【答案】B
22.
【解析】句意：你想象不到这么一个表现良好的绅士竟然会对一个女士这么粗鲁。
【答案】C
23.
【解析】shall此处表示警告。
【答案】A
24.
【解析】B此处考查情态动词表示推测的用法。should have done表示过去应该做而实际并没有做，因此淘汰A项。would不用来表推测，因此淘汰C项。B基与D项虽然都可以表示推测，但B项表肯定意义而D项表示否定推测，意为不可能，根据句意：他肯定已完成了他的工作;不然，他就不会在海边玩得那么愉快了。可知此处需要肯定意义，因此淘汰D项。
25.
【解析】B本题考查情态动词的用法。must表示推测只能用于肯定句，否定句用can或could 代替。shouldnt have done 表示本来不该而实际上却做了某事.neednt have done表示本来不必而实际上却做了均不合题意。本句的意思是：当事故发生时我不可能超过6岁。
26.
【解析】C should(按道理)应该;句意：既然你在驾校时做了大量练习，那么通过这次考试理不应该有困难。
27.
【解析】B 第一句话使用了一般过去时，由此可知第二句话是对过去事情的猜测，需用must have done.本题意为我正在高速公路上行驶，这时一辆警车跟随着着这辆车从旁边经过。它们一定是以至少每小时150公里的速度行驶。故选B。A项表示本应该，C项表示本能够不合题意。
28.
【解析】D 本题考查情态动词的用法。句意是我错拿了别人的绿色 毛衣，那可能是Harry的，他总是穿绿色的毛衣。四个选项中could表示推测。mustnt 表示 禁止has to 表示不得不will 表推测时，表肯定语气太强。
29.
【解析】B根据句意可知Catherine对对方为她打扫了房间表示感谢并提到对方本来不必为她打扫房间。很显然对方打扫房间是过去所为，表达去不必做某事用neednt have done sth.
30.
【解析】C本题考查情态动词，从答语的后半句我已经借到一本字典了，可知前半句为不必了。故C正确。
篇3：情态动词与虚拟语气
(一)
1.—Can't you stay a little longer?
—It's getting late.I really________go now.My daughter is home alone.
解析：句意：——你不能再多呆会儿吗?——很晚了，我必须得走了。我女儿一个人在家。must“必须，必然要，必定会”。
答案：must
2I________(not) have worried before I came to the new school，for my classmates here are very friendly to me.
解析：句意：我来新学校之前本没有必要担心，因为这里我的同学对我非常友好。needn't have done“本没有必要做某事，表示实际上已经做了某事”。
答案：needn't
3.—Sorry，Mum!I failed the job interview again.
—Oh，it's too bad.You________have made full preparations.
解析：根据语境，本句用should have done sth表示“本应该做某事”，暗含对对方的责怪。
答案：should
4. You________feel all the training a waste of time，but I'm a hundred percent sure later you'll be grateful you did it.
解析：句意：你可能觉得所有的训练都是浪费时间，但是我有100%的把握你以后会感激它的。may“(不确定)可能”。
答案：may
5. I've ordered some pizza，so we ________ worry about cooking when we get home tired.
解析：句意：我已经预订了一些比萨饼，所以当我们到家感到累的时候就不必担心做饭的事了。本题考查情态动词。根据句意可知答案为needn't。
答案：needn't
6. It was sad to me that they，so poor themselves，________ bring me food.
解析：句意：让我难过的是，他们自己那么贫穷，竟然还给我带来食物。本题考查情态动词。情态动词should可以表示说话人惊讶的语气，意为“竟然”。
答案：should
7. The door ________ open，no matter how hard she pushed.
解析：句意：不管她怎么用力推，门就是打不开。“won't/wouldn't open”可表示门很难打开。此处open主动形式表示被动意义。本句题干中有“pushed”，故设空处填wouldn't。
答案：wouldn't
(二)
1.—Can I smoke in this hall?
—No，you can't.If you________，please go to the smoking room.
解析：句意：——我能在大厅吸烟吗?——不行，如果你非要吸，请去吸烟室。此题考查情态动词的特殊用法。must在这里意为“非得，偏要”。
答案：must
2.I________thank you too much because without your help I wouldn't have won the first prize.
解析：句意：我都不知道该怎么谢你了。没有你的帮助我不会获得一等奖。can't与too连用，意为：“再……也不为过”。
答案：can't
3.—I'll have to write a report about “Jane Eyre” next week，but I haven't got the book yet.
—Don't worry.You________have it by noon tomorrow.
解析：句意：——我下周要写一篇关于《简·爱》的报告，但我还没有书呢。——别担心。到明天中午你就会拿到了。此题考查情态动词shall的用法。shall与第二、三人称连用，用于陈述句表示说话者给对方的允诺。
答案：shall
4.—It is a mystery and a shock to all who know him that he________have taken his own life in this way.
—What a pity，indeed.
解析：句意：——他竟然用这种方式结束自己的生命，这让所有认识他的人感到费解和震惊。——真可惜。此题考查情态动词should的用法。should表示对某事不能理解，感到意外，意为“竟会，竟然”。
答案：should
5.Nuclear energy________be really dangerous at times even though it's a kind of nice energy in general.
解析：句意：尽管核能在总体上是一种不错的能源，但它有时可能真的会很危险。can用于肯定句可表示客观上的可能性，意为：“有时会，可能会”。
答案：can
6.It is required by law that a driving test________(take) before a man gets a license.
解析：句意：法律规定，一个人在获得驾照之前要先参加驾照考试。It is required that...中，that从句的谓语动词用“should+动词原形”，其中should可以省略;又因为test与take之间是被动关系，故用被动语态，即(should) be taken。
答案：(should) be taken
7.I________(go) through the hard times but for my teacher's generous and timely help.
解析：句意：要不是老师慷慨而及时的帮助，我不可能熬过那段艰难的岁月。根据句意可知设空处为与过去事实相反的虚拟语气，故答案为couldn't have gone。本句中的but for相当于if it hadn't been for...。
答案：couldn't have gone