Should型虚拟语气练习题
虚拟语气在从句中用should的情况
虚拟语气在从句中用should的情况1. 在建议、要求、命令、想法后的动词后的宾语从句里, 用should + 动词原形, should 可以省略. 如advise, agree, command, decide, demand, determine, indicate, insist, order, propose, request, require, suggest, urge.The doctor suggested that she (should) take good care of herself.2. 在建议,要求,命令,想法后的名词后的从句里, 用should + 动词原形, should可以省略. 如advice, agreement, command, decision, demand, determination, indication, insistence, order, preference, proposal, request, requirement etc.It was Bill’s suggestion that everyone (should) have a map. (主语3. 在It is/was +形容词后that引起的主语从句中用should 的结构, should 可以省略。
这类形容词常见的有: advisable, anxious, compulsory, crucial, desirable, eager, essential, impossible, improper, important, natural, necessary, obligatory,possible, preferable,probable,recommended, urgent, vital; strange, surprising, unnatural，etc.It's natural that she (should) do so.It is important that we (should) learn English well.4. 在 It’s （about）/（high）time 后的that 从句中, 用过去式,有时也可用should + do 的形式表示“该是做什么的时候” should 不能省略。
英语虚拟语气练习题及答案解析---
英语虚拟语气练习题及答案解析1.The judge ordered that the thief _____ punished.A. would beB. should beC. were to beD. must be答案：B解析：译文：法官命令惩罚这个小偷。
本题考查should do虚拟。
表命令、建议等词，后面的从句谓语要用should do，should可以省略，故选B。
2.If the United States had not entered the Second World War, probably the 1940 unemployment rate of 14% _____ still further.A. would riseB. would risenC. would have risenD. had risen答案：C解析：译文：如果美国没有加入二战，可能1940年的失业率会进一步上升。
本题考查if引导的非真实条件句。
根据had not entered可知句子对过去虚拟，主句要用would/should/might/could+ have done，故选C。
3.I wish I _____ you yesterday.A. sawB. did seeC. had seenD. were to see答案：C解析：译文：我多希望我昨天能见到你。
本题考查虚拟语气。
Wish后面的句子要用虚拟语气，对过去虚拟用had done，对现在虚拟用did/were，对将来虚拟用would do/could do。
根据yesterday可知对过去虚拟，故选C。
4.Without electricity, human being life _____ quite different today.A. wouldB. will beC. would have beenD. would be答案：D解析：译文：没有电的话，人类如今的生活会大不一样。
中考英语虚拟语气练习题40题
中考英语虚拟语气单选题40题1.If I were you, I ______ study harder.A.willB.wouldC.canD.must答案：B。
对现在情况的虚拟，主句用“would/could/should/might+动词原形”。
A 选项will 用于一般将来时，不符合虚拟语气的用法；C 选项can 表示能力，也不符合虚拟语气的用法；D 选项must 表示必须，同样不符合虚拟语气的用法。
2.If I had more time, I ______ read more books.A.willB.wouldC.canD.must答案：B。
对现在情况的虚拟，主句用“would/could/should/might+动词原形”。
A 选项will 用于一般将来时，不符合虚拟语气的用法；C 选项can 表示能力，也不符合虚拟语气的用法；D 选项must 表示必须，同样不符合虚拟语气的用法。
3.If I knew his phone number, I ______ call him.A.willB.wouldC.canD.must答案：B。
对现在情况的虚拟，主句用“would/could/should/might+动词原形”。
A 选项will 用于一般将来时，不符合虚拟语气的用法；C 选项can 表示能力，也不符合虚拟语气的用法；D 选项must 表示必须，同样不符合虚拟语气的用法。
4.If I were taller, I ______ play basketball better.A.willB.wouldC.canD.must答案：B。
对现在情况的虚拟，主句用“would/could/should/might+动词原形”。
A 选项will 用于一般将来时，不符合虚拟语气的用法；C 选项can 表示能力，也不符合虚拟语气的用法；D 选项must 表示必须，同样不符合虚拟语气的用法。
初三英语虚拟语气(三)练习题30题
初三英语虚拟语气(三)练习题30题1.If I were a bird, I ____ fly freely in the sky.A.canB.couldC.wouldD.should答案：C。
本题考查对现在情况的虚拟语气。
if 引导的虚拟条件句中，如果表示与现在事实相反，从句用一般过去时（be 动词用were），主句用would/could/should/might + 动词原形。
A 选项can 表示能力，不用于虚拟语气；B 选项could 也可以用于虚拟语气，但此处表示“愿意”，用would 更合适；D 选项should 表示“应该”，不符合语境。
2.If he had time, he ____ go to the park.A.willB.wouldC.canD.could答案：B。
对现在情况的虚拟语气，if 从句用一般过去时，主句用would/could/should/might + 动词原形。
A 选项will 用于一般将来时，不用于虚拟语气；C 选项can 表示能力，不用于虚拟语气；D 选项could 也可以，但此处用would 更强调“愿意”。
3.If I had a million dollars, I ____ buy a big house.A.willB.wouldC.canD.could答案：B。
对现在情况的虚拟语气，if 从句用一般过去时，主句用would/could/should/might + 动词原形。
A 选项will 用于一般将来时，不用于虚拟语气；C 选项can 表示能力，不用于虚拟语气；D 选项could 也可以，但此处用would 更强调“想要”。
4.If she were taller, she ____ be a model.A.canB.couldC.wouldD.should答案：C。
对现在情况的虚拟语气，if 从句用一般过去时，主句用would/could/should/might + 动词原形。
虚拟语气2should+v
Practice
1. He B have completed his work; otherwise, he wouldn't be enjoying himself by the seaside.
A. should
B.must
C.wouldn't
D.can't
3. It is requested that the meeting (should) be put off.
主语从句
4. His suggestion was that you (should) try once more.
表语从句
5. She made the demand that the journalists leave at once for Iraq.
wouldn't have done 本不会做而做了 couldn't have done 本不能够做而做了 needn’t have done 本没必要丛而做了
Grammar is logical !
区别“本系列” & 情态动词对过去的推测
must have done:过去一定做过某事 can/ could have done: 过去可能做过某事 may/might have done：过去可能做郭某事（could have done比might have done语气更强） couldn’t have done：过去不可能做过某事
B. not be sent; that
C. should not be sent; what
D. should not send; what
2. It is strange _th_a_t_h_e_s_h_o_u_ld__b_e_co_m__e_m__y_fr_ie_n_d_.(become) 他竟然成为我的朋友，真是奇怪。
2024年中考英语虚拟语气用法辨析练习题30题
2024年中考英语虚拟语气用法辨析练习题30题1.If I were you, I _____ study harder.A.willB.wouldC.shallD.should答案：B。
本题考查对现在情况的虚拟语气。
if 引导的虚拟条件句，对现在情况虚拟时，从句用一般过去时，be 动词用were，主句用“would/should/could/might + 动词原形”。
选项 A 是一般将来时，不符合虚拟语气的用法；选项 C 和 D 通常不用于这种虚拟语气的表达。
2.She _____ be very happy if she knew the truth.A.willB.wouldC.shallD.should答案：B。
同样是对现在情况的虚拟语气，主句用“would/should/could/might + 动词原形”。
选项A 一般将来时错误；选项C 和D 在此处不恰当。
3.If he had time, he _____ go to the park.A.willB.wouldD.should答案：B。
对现在情况虚拟，主句“would/should/could/might + 动词原形”。
选项A 将来时不对；选项C 和D 不用于此。
4.I _____ buy a new bike if I had enough money.A.willB.wouldC.shallD.should答案：B。
还是对现在情况的虚拟，主句用“would/should/could/might + 动词原形”。
选项A 一般将来时错误；选项C 和D 不合适。
5.If they were here, they _____ help us.A.willB.wouldC.shallD.should答案：B。
对现在情况虚拟，主句“would/should/could/might + 动词原形”。
选项A 将来时不行；选项C 和D 不恰当。
2024年高二英语虚拟语气运用高级分析练习题20题
2024年高二英语虚拟语气运用高级分析练习题20题1.If I were you, I _____ study harder.A.willB.wouldC.canD.could答案：B。
本题考查对现在情况的虚拟语气。
if 引导的条件句中，be 动词一律用were，主句用“would/could/should/might+动词原形”。
A 选项will 用于一般将来时，不是虚拟语气用法；C 选项can 表示能力，不符合虚拟语气；D 选项could 表示能力或可能性，也不是对现在情况虚拟语气的标准用法。
2.If he _____ more time, he would read more books.A.hasB.hadC.haveD.will have答案：B。
这是对现在情况的虚拟语气。
在if 条件句中，对现在情况虚拟用过去式，have 的过去式是had。
A 选项has 是一般现在时；C 选项have 是原形，也不对；D 选项will have 是一般将来时，不符合虚拟语气要求。
3.If she were a doctor, she _____ help many people.A.canB.willC.wouldD.could答案：C。
对现在情况虚拟，主句用“would/could/should/might+动词原形”。
A 选项can 不是虚拟语气用法；B 选项will 用于一般将来时，不对；D 选项could 虽然也可以，但这里用would 更符合表达习惯。
4.If they _____ rich, they would travel around the world.A.areB.wereC.will beD.would be答案：B。
对现在情况虚拟，if 条件句中be 动词用were。
A 选项are 是一般现在时；C 选项will be 是一般将来时；D 选项would be 是虚拟语气但不是在条件句中。
九年级专项练习题及虚拟语气中should的用法
九年级专项练习题及虚拟语气中should的用法虚拟语气是英语中比较难以掌握的语法之一，而其中should的用法更是容易被人忽略或者混淆。
作为九年级的学生，要想在英语中表达准确流畅，卓越运用虚拟语气是必不可少的。
本篇文章将为大家带来一些九年级专项练习题，并深入剖析虚拟语气中should的应用，以帮助大家掌握该知识点。
练习题部分1. If you want to become a doctor, you ________ study hard.A. mustB. mayC. shouldD. need2. Peter suggests that the meeting ________ postponed until next Friday.A. isB. beC. should beD. will be3. If the building materials ________ environmental-friendly, the environment would be much better.A. would beB. wereC. areD. have been4. If I ________ you, I would take some measures to avoid more serious consequences.A. amB. wereC. have beenD. will be5. If it ________ heavy rain tomorrow, the game will be canceled.A. hasB. will haveC. would haveD. is going to have应用部分虚拟语气在英语中主要有三种表现形式，分别是虚拟条件句、虚拟语气表建议和虚拟语气表遗憾。
而在这些表现形式中，should的用法也有所不同。
1. 虚拟条件句中should的用法虚拟条件句中should通常用于表示“应该做……”、“理应做……”之类的含义。
初三英语虚拟语气单选题50题(带答案)
初三英语虚拟语气单选题50题(带答案)1.If I were you, I ______ study harder.A.willB.wouldC.shallD.should答案：B。
本题考查与现在事实相反的虚拟语气，其结构为“if+主语+动词的过去式（be 动词用were），主语+would/could/should/might+动词原形”。
选项A 是一般将来时，不符合虚拟语气结构；选项C 和D 虽然也可以用在虚拟语气中，但通常与“should+动词原形”或“be to+动词原形”结构搭配，而不是与“if I were you”搭配。
所以正确答案是B。
2.If he ______ more time, he could finish the project.A.haveB.hasC.hadD.having答案：C。
与现在事实相反的虚拟语气结构为“if+主语+动词的过去式，主语+would/could/should/might+动词原形”。
选项A 和B 是一般现在时，不符合虚拟语气结构；选项D 是现在分词，不能单独作谓语。
所以正确答案是C。
3.If she ______ taller, she could play basketball better.A.beB.isC.wereD.was答案：C。
与现在事实相反的虚拟语气中，be 动词要用were。
选项 A 和B 不符合虚拟语气结构；选项D 是过去式，但在虚拟语气中，be 动词要用were。
所以正确答案是C。
4.If we ______ a magic wand, we could solve all the problems.A.haveB.hasC.hadD.having答案：C。
与现在事实相反的虚拟语气结构为“if+主语+动词的过去式，主语+would/could/should/might+动词原形”。
选项A 和B 是一般现在时，不符合虚拟语气结构；选项D 是现在分词，不能单独作谓语。
高中英语虚拟语气练习题(附答案)
高中英语虚拟语气讲解及练习虚拟条件句就是对现实条件的一种虚拟假设，所假设的条件一般不符合事实或与事实相反或在现实中发生的可能性极小。
根据时间的不同，虚拟条件句可分为三种，即与现在事实相反的虚拟条件句、与过去事实相反的虚拟条件句（1）表示与现在事实相反If I had enough money now, I would lend it to you.（2）表示与过去事实相反If he had taken your advice, he wouldn’t have made such a bad mistake.（3）表示与将来事实相反I would go shopping with you if it were to be Sunday tomorrow.1. 虚拟条件句的倒装在虚拟条件句中，为了强调所假设条件的虚拟性，或突出说话人的一种主观愿望，虚拟条件句可用倒装结构。
虚拟条件句的倒装是通过去掉if，把条件从句谓语中的助动词、情态动词或系动词放在句首实现的。
例如：Had I been（= If I had been ） in that situation， I would not have let the thief escape away with so much money.Should there be （= If there should be） a drought， what should we do at that time ？2. 错综时间条件句有时条件从句的动作和主句的动作发生的时间并不一致，这时谓语动词的形式应根据它所要表示的具体时间来确定。
例如：If we hadn’t been working hard in the past few years ，thing s wouldn’t be going so smoothly.3. 含蓄条件句有时假设的情况并不以条件从句的形式表现出来，而是通过某个介词或介词短语（如：with，otherwise，without，but for，in that position）、上下文或其它方式表现出来。
虚拟语气题目带解析
1. We desire that immediate help _________ to the local villagers who have been trapped by the flood.A. be givenB. will be givenC. should giveD. is given1. 【解析】desire后面接同位语或宾语从句时，从句中用虚拟语气，即“should + 动词原形”的形式，should 可以省略。
【答案】A2. She came up with a suggestion that all the students ________ into the library at least twice a week.A. be allowedB. was allowedC. should allowD. are to allow2. 【解析】：根据句意“她提议所有的学生应该允许进入图书馆每周至少两次。
”本句是虚拟语气，后面的结构是should be allowed, should 可以省略。
【答案】A3. ________ I were you, then I could also go there to have a good holiday.A. Only ifB. If onlyC. ShouldD. would have3. 【解析】：句意：如果我是你多好啊，那时我就可以也到那儿度假了。
If only“要是……多好啊！”，后面用虚拟语气形式；only if“只要，只有”，后面用陈述语气形式；C.D两项是错误的。
【答案】C4. If only I ___________ the truth, he would not be so crazy now.A. didn’t tellB. had not toldC. haven’t toldD. don’t tell4.【解析】：if only后面要用虚拟语气。
2024年高三英语虚拟语气特殊用法练习题30题
2024年高三英语虚拟语气特殊用法练习题30题1.If I were a bird, I ____ fly freely in the sky.A.canB.couldC.wouldD.should答案：C。
本题考查对现在情况的虚拟语气。
if 引导的虚拟条件句中，如果表示与现在事实相反，谓语动词形式为：从句用过去式（be 动词用were），主句用would/could/should/might + 动词原形。
选项A 是一般现在时的情态动词，不符合虚拟语气的用法；选项B could 表示能力，不如would 语气合适；选项D should 表示应该，不符合本题语境。
2.If he ____ more time, he would do better in the exam.A.haveB.hadC.hasD.having答案：B。
对现在情况虚拟，从句用过去式，have 的过去式是had。
选项 A 是原形，不符合虚拟语气用法；选项C 是一般现在时第三人称单数形式，也不对；选项D having 不能单独做谓语。
3.If she ____ taller, she could be a model.A.beB.wereC.isD.was答案：B。
与现在事实相反的虚拟语气，be 动词用were。
选项A be 动词原形，不能单独在此处使用；选项C、D 分别是一般现在时的is 和was，不符合虚拟语气要求。
4.If I ____ a millionaire, I would help the poor.A.amB.wereC.beD.was答案：B。
对现在情况虚拟，be 动词用were。
选项A am 是一般现在时，错误；选项C be 动词原形不能直接用；选项D was 不如were 更符合虚拟语气的要求。
5.If they ____ harder, they would get better grades.A.studyB.studiedC.will studyD.studies答案：B。
虚拟语气带练习
虚拟语气: 表示说话人的愿望、假设、猜测或建议,而不表示客观存在的事实。
虚拟语气通过谓语动词的特殊形式来表示。
一、在if引导的非真实条件句中注意：主句中的should通常用于第一人称,would可用于任何人称,同时也可根据意思用情态动词could, might等代替should, would。
从句中的should可用于各种人称。
✧表示与现在事实相反：if从句用过去时，主句用should/would/could/might + v.原形If I were you, I would study harder.✧表示与过去事实相反：if从句用过去完成时，主句用should/would/could/might + have doneI could have done better if I had been more careful.If you had come yesterday, you would have met him.✧表未来实现可能性小，if从句用should/were to，主句用should/would/could/might + v.原形If I should / were to do the experiment, I would do it some other way.If it should rain, the crops would be saved.✧如果条件句与语句的时间不一致，动词的形式要根据它所表示的时间加以调整。
If Jack had taken my advice, he would feel much better now.✧if的省略：如果if条件句中有were, had或should，可以省略if，把这几个词放在主语之前，构成倒装。
Were you in my position ( = if you were in my position), you would do the same.Were I in school again, I would work harder.Had he been more careful ( = If he had been more careful), such mistakes could have been avoided.Had you been here earlier, you would have seen him.Should he come ( = If he should come), tell him to ring me up.Should there be a meeting tomorrow, I would come二．I wish (that) … 后的宾语从句中的虚拟语气：主要表示愿望。
Should型虚拟语气
Should型虚拟语气专四的Should型虚拟语气专题1. It is imperative that students____ their term papers on time. (04真题，46题)A. hand inB. would hand inC. have to hand inD. handed in[答案]A.学生必须准时交学期论文。
本题考虚拟语气。
It is imperative, vital, important, essential, etc. +that 引导的从句用（should）do虚拟形式，should可省。
2. I am surprised__ this city is a dull place to live in.(06真题，57题)A that you should thinkB by what you are thinkingC that you would thinkD with what you were thinking[答案]A.我感到奇怪的是你竟会认为住在这个城市很乏味。
本题考虚拟语气。
在表示建议、命令、要求、惊讶以及表示“重要性”和“紧迫性”等含义的主语从句、宾语从句、表语从句和同位语从句中，谓语动词常用虚拟语气，由“动词原形”或“（should）+动词原形”构成。
3. It is imperative that the government __ more investment into the shipbuilding industry.（06真题，59题）A attractsB shall attractC attractD has to[答案]C. 政府为造船业吸引更多的资金是极其重要的。
本题考虚拟语气。
做表语用的should（必须的，必要的）后面的主语从句中用虚拟语气。
4. It is absolutely essential that William ________his study in spite of some learning difficulties.（07年真题，65题）A. will continueB. continuedC. continueD. continues[答案]C.尽管学习很难，威廉姆还是英爱继续学业，这点十分重要。
虚拟语气练习题及答案
虚拟语气练习题及答案1. 如果我早知道这个秘密，我就不会告诉他。
- 答案：If I had known the secret, I would not have told him.2. 她建议我们明天去公园。
- 答案：She suggested that we go to the park tomorrow.3. 我真希望我去年夏天能去欧洲旅行。
- 答案：I wish I could have traveled to Europe last summer.4. 他要求我们不要迟到。
- 答案：He demanded that we not be late.5. 要是我有足够的钱，我会买那辆车。
- 答案：If I had enough money, I would buy that car.6. 她本应该早点告诉我的。
- 答案：She should have told me earlier.7. 他命令我们立即离开。
- 答案：He ordered us to leave immediately.8. 要是你努力学习，你就能通过考试。
- 答案：If you studied hard, you could pass the exam.9. 我本可以帮你，但我太忙了。
- 答案：I could have helped you, but I was too busy.10. 他希望我们能原谅他的过错。
- 答案：He hopes that we can forgive his mistakes.答案解析- 虚拟语气通常用于条件句中，表示与现实相反的情况。
在这些练习题中，我们可以看到条件句的两种形式：与现在事实相反（用过去时），与过去事实相反（用过去完成时）。
- 在建议、命令或要求的句型中，虚拟语气通过使用“should + 动词原形”来表达，其中“should”可以省略。
- “Wish”后面跟的从句通常使用虚拟语气，表示愿望或希望，根据时间的不同，可以使用不同的时态来表达。
高三英语虚拟语气特殊用法练习题30题
高三英语虚拟语气特殊用法练习题30题1.If I were you, I ______ study harder.A.willB.wouldC.shallD.should答案：B。
本题考查虚拟语气在条件状语从句中的用法。
如果我是你，这是与现在事实相反的假设，从句用一般过去时（be 动词用were），主句用“would/could/should/might+动词原形”。
选项A 是一般将来时，不符合虚拟语气的要求；选项 C 和 D 在这种情况下也不适用。
2.If he ______ more time, he could finish the project.A.hadB.hasC.haveD.having答案：A。
与现在事实相反的假设，从句用一般过去时，主句用“would/could/should/might+动词原形”。
选项B 是一般现在时，选项C 是动词原形，选项D 是现在分词，都不符合要求。
3.If it ______ tomorrow, we would stay at home.A.rainedB.rainsC.will rainD.is raining答案：A。
与将来事实相反的假设，从句用一般过去时或“should+动词原形”或“were to+动词原形”，主句用“would/could/should/might+动词原形”。
选项B 是一般现在时，选项C 是一般将来时，选项D 是现在进行时，都不符合要求。
4.If she ______ to my advice, she wouldn't be in trouble now.A.had listenedB.listenedC.would listenD.listens答案：A。
与过去事实相反的假设，从句用过去完成时，主句用“would/could/should/might+have+过去分词”。
选项B 是一般过去时，选项C 是对将来的虚拟，选项D 是一般现在时，都不符合要求。
2、should do或be型虚拟语气
He took a taxi to the stationso thatheshould not missthe train.
(b)in case引出的从句中,有时也用should do / be型谓语
Take your coatin caseitshould rain.
Itwillbebetterthat the meetingshould be put offtill next Saturday.
He realized (that)it wasimportanthe (should) keep calm.
It isnecessarythat heshould be sentthere at once.
Mama hadarrangedthat Mrs. Brown(should) comeoccasionally to help us.
Heasksthat heshould be givenan opportunity to explain his case.
Hewas determinedthat his childrenshould goto the best school available.
It isstrangethat sheshould have failedto see her own shortcomings.
It issurprisingthat theyshould choosethis method of passing the evening.
That heshould dosuch a thing!
１.在wish所接的宾语从句中
①过去式指现在
I wish Ihadyour brains.
省略should的虚拟语气
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A38.He insisted that we all _____ in his
office at one o’clock. A. be B. to be C. would be D. shall be
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A
40.I must go there earlier. John has suggested that I _____ an hour before the
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4. The workers demanded that_t_h_e_ir_p_a_y__(s_h_o_u_l_d_)_b_e_r_a_i_se_d___(增加工资). 5. He insisted that_J_o_h_n_(_s_h_o_u_ld_)__d_o_t_h_e_j_o_b__(约翰干这项工 作). 6. She suggested that _th__e_m_e_e_t_in__g_(_s_h_o_u_ld_)_b_e__p_u_t_o_ff___(会议应该推 迟)till next week.
clean the blackboard after class. 老师建议我们课后把黑板擦了。 2) He insisted that all of us should be there on time by any means. 他坚持要我们大家想尽办法按时去那儿。
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在句型"It is suggested (requested, proposed, desired, ordered) that .... "中，that 后面的从句 中的谓语动词用： should + 动词原形。
A．should leave B．must leave
Should型虚拟语气练习题
Should型虚拟语气练习题Should型虚拟语气练习题1. 用于if引导的虚拟条件句中在表示与现在或将来事实相反的非真实条件句中，谓语动词形式可用“should + do”。
如：If she should refuse, they could be greatly disappointed.【考例】This printer is of good quality. If it _______ break down within the first year, we would repair it at our expense. （2009年，天津）A. would?B. shouldC. could??D. might2. 用于省略if的倒装句中如果条件状语从句的谓语动词中含有should，可以省略连词if，而把should放在主语前构成倒装。
如：Should he fail in the examination, he would have to wait for another year.【考例】 ______ fired, your health care and other benefits will not be immediately cut off. (2006年，湖北)A. Would you beB. Should you beC. Could you beD. Might you be3. 用于主语从句中在“It is ＋形容词／某些动词的过去分词＋ that从句”的结构中，从句的谓语动词用“（should）+ do ”虚拟语气形式来表示命令、要求和建议。
这些形容词和过去分词常见的有important（重要的）、essential（必要的）、necessary（必须的）、natural（自然的）、decided（决定的）、ordered（命令的）、demanded（要求的）、proposed（建议的）、required（要求的）等。
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Should型虚拟语气练习题
1. 用于if引导的虚拟条件句中
在表示与现在或将来事实相反的非真实条件句中，谓语动词形式可用“should + do”。
如：If she should refuse, they could be greatly disappointed.
【考例】This printer is of good quality. If it _______ break down within the first year, we would repair it at our expense. （2009年，天津）
A. would
B. should
C. could
D. might
2. 用于省略if的倒装句中
如果条件状语从句的谓语动词中含有should，可以省略连词if，而把should放在主语前构成倒装。
如：
Should he fail in the examination, he would have to wait for another year.
【考例】______ fired, your health care and other benefits will not be immediately cut off. (2006年，湖北)
A. Would you be
B. Should you be
C. Could you be
D. Might you be
3. 用于主语从句中
在“It is ＋形容词／某些动词的过去分词＋that从句”的结构中，从句的谓语动词用“（should）+ do ”虚拟语气形式来表示命令、要求和建议。
这些形容词和过去分词常见的有important（重要的）、essential（必要的）、necessary（必须的）、natural（自然的）、decided（决定的）、ordered（命令的）、demanded（要求的）、proposed（建议的）、required （要求的）等。
如：
It is necessary that we (should) make everything ready ahead of time.
【考例】It is essential that all these figures ________ twice. (2008年，四川联考)
A. check
B. checked
C. are checked
D. be checked
4. 用于宾语从句中
表示主观判断、推测、建议、命令和要求的动词后的宾语从句中，谓语动词常采用“（should）+ do”的形式。
这类动词包括advise（劝告），ask（要求），insist（坚持），order（下令），suggest（建议），command（命令），demand（要求），require（要求）等。
He insisted that a deadline (should) be set for completing the task.
【考例】The doctor recommended that you ______ swim after eating a large meal.（2009年，浙江）
A. wouldn’t
B. couldn’t
C. needn’t
D. shouldn’t
【疑难辨析】动词insist如不表示要求，而表示“坚持己见”时，宾语从句用陈述语气。
同样，当suggest所表示的意思为“表明”或“暗示”时，谓语动词也不采用“should + do”的形式。
如：Jane insisted that she had done nothing wrong and that she should be treated properly. The surprised look on his face suggested that he did not believe the fact.
【巧记速记】
常见动词后的宾语从句中需用“(should) + do”虚拟语气有：
一个坚持：insist
两个命令：order, command
三个建议：suggest, advise, propose
四个要求：demand, require, ask, desire
注意：在以it为形式宾语的复合宾语从句中也可以用虚拟语气，其形式为“（should）+ do”。
这一句型中使用的形容词（宾补）与主语从句中的虚拟语气所使用的形容词相同。
如：
We think it advisable that he (should) think deeply before acting.
5. 用于表语（或同位语）从句中
在表示命令、建议、劝告等含义的名词后面的表语（或同位语）从句中，谓语动词须用“（should）+ do”的形式。
这些名词包括advice（忠告），decision（决定），demand （要求），desire（渴望），idea（想法），proposal（提议），recommendation（推荐），requirement（要求），suggestion（建议）等。
如：
I make a proposal that we(should) hold a meeting next week.
【考例】Their requirement that he ______ one year’s experience is reasonable.（2009年，蚌埠市三质检）
A. had
B. has
C. have
D. would have
6. 用于目的状语从句中
由in case, lest, for fear that引导的目的状语从句，谓语动词用“（should）+ do”结构，表示忧虑或目的。
其形式通常为“... lest (in case, for fear tha t) + 主语+ （should）+ do”。
如：
I will not make any noise, lest I should disturb you.
【考例】The mad man was put in the soft-padded cell lest he ______ himself.（2009，四川联考）
A. injure
B. had injured
C. injured
D. would injure。