虚拟语气中should何时省略
虚拟语气的特殊用法
虚拟语气的特殊用法江苏省郑集高级中学李博雅一．在动词suggest(提议 ,提出 ,建议 ), advise(劝告 ,忠告 ), order( 命令 ,下令 ,吩咐 ), demand(要求 ), propose(提议 ), require( 要求 ), insist( 坚持 , 坚决主张 ), command( 命令 ), request(请求 , 恳求 ), desire(请求 ), prefer( 提出 )等动词后的宾语从句的谓语，这些词的过去分词作表语时主语从句的谓语，以及这些词的名词同位语从句、作主语时的表语从句的谓语常用“should + 动词原形”构成的虚拟语气, should 可以省略。
如：1.The man demanded that Tom (should) apologize .2.He insisted that we ( should) take up the matter at the meeting.3.I requested that he (should) use his influence on my behalf.4.The general ordered the soldiers (should) cross the river at once. （宾语从句）=The general’s order was that the soldiers (should) cross the river at once. （表语从句）=It was ordered that the soldiers ( should) cross the river at once. （主语从句）=The general gave the order that the soldiers ( should) cross the river at once. （同位语从句）5. I suggest that he (should) be careful. （宾语从句）=My suggestion is that he ( should) be careful.（表语从句）=It is suggested that he (should) be careful. （主语从句）=I gave him the suggestion that he ( should) be careful. （同位语从句）二．在动词wish 后的宾语从句的谓语应用虚拟语气，现在或将来的动作用过去式( 常含有情态动词 could 或 would) ；过去的动作用过去完成式。
虚拟语气的规则总结
虚拟语气虚拟语气：表示动作或状态不是客观存在的事实，而是说话人的主观愿望、假设或推测等。
一、if从句：（二）错综时间的虚拟句：通常情况下,在条件句中主句和从句的谓语动词所指时间一致, 但有时也可能指不同的时间,这时主句和从句的动作不是发生在同一时间，其动词形式要根据时间而定。
1. If I were you, I would have taken his advice. (从句指现在, 主句指过去)。
2. If I had taken my raincoat with me this morning, I would not be wet now. (从句指过去,主句指现在)。
3. If we hadn’t been working hard in the past few years, things wouldn’t be going so smoothly.（从句指过去，主句指现在）。
4. If the weather had been more favorable, the crops would be growing still better.（从句指过去，主句指现在）。
5. If we had not got everything ready by now, we should be having a more terrible time tomorrow. （从句指现在，主句指将来）??（三）省略：If 从句中含有were, should, had时，可省略if并把were, should, had提前。
例如：Were I you, I wouldn’t quarrel with him.备注：注：would, should, could与might的选择：①一般常用would，如同在真实条件句中主句常要用will一样。
常译作“将、就会”。
如：If I knew him, I would ask him for help. 如果我认识他的话，我就会向他求助。
虚拟语气should do结构
虚拟语气should do结构【原创版】目录1.虚拟语气的定义与作用2.should do 结构的构成3.should do 结构的用法及举例4.should do 结构与其他虚拟语气结构的区别正文一、虚拟语气的定义与作用虚拟语气是英语语法中的一个重要部分，主要用来表示与事实相反的假设、建议、愿望等。
在英语中，虚拟语气通常通过特定的动词形式和助动词 should 来表达。
should do 结构是虚拟语气中常见的一种形式，用来表示应该做的事情。
二、should do 结构的构成should do 结构由助动词 should 和动词原形组成，其中 should 可以省略。
should do 结构的构成有以下三种情况：1.should + 动词原形：如 should do（应该做某事）2.should + have + 过去分词：如 should have done（本应该做某事）3.should + have + 过去分词：如 should have been doing（本应该一直在做某事）三、should do 结构的用法及举例should do 结构主要用于以下三种情况：1.表示建议：如 You should go to the doctor（你应该去看医生）。
2.表示应该做的事情：如 We should help each other（我们应该互相帮助）。
3.表示对过去的评价：如 She should have finished her homework yesterday（她昨天本应该完成她的作业）。
四、should do 结构与其他虚拟语气结构的区别should do 结构是虚拟语气中的一种，但它与其他虚拟语气结构有所不同。
例如，与表示对过去的虚拟语气（would + have + 过去分词）相比，should do 结构表示的是应该做的事情，而 would + have + 过去分词表示的是与过去事实相反的假设。
虚拟语气完整用法
虚拟语气一、用固定的情态动词表示的虚拟语气1、 should +动词原形(有时省略should)(1)用在动词如advise, request, require, suggest, urge,demand,desire,command, insist, order, propose, recommend, 等后的宾语从句中。
例如:1)They requested that we (should) send a invitation to their school、2)He urged that he acquaint and apply the methods、2、用在it is suggested,it has been decided, it is desired, it was proposed,it is required, it was ordered, it is necessary (essential, imperative, important, desirable) that等引出的主语从句中。
例如:1)It is required that we (should) get everything done by tomorrow night、2)It is imperative that the teachers (should) have a thorough knowledge of the subject they teach、3、用在suggestion, motion, proposal, order, recommendation, plan, idea, requirement等引起的表语从句与同位语从句例如:She drives her vessel carefully lest she should lost her way、4.用在表示比拟的方式状语从句中例如:He laughed as if he had never been happier before、5.用在表示虚拟情况的定语从句中例如:It is high time you stop bitting your child、6.用在某些表示主观愿望的名词从句中例1:I wish I were as tall as you、例2:He insisted that we (should) catch up the first bus in the morning、7.用在婉转的请求、建议、批评等句子中例1:Could you hand me some pepper?例2:You might have told me earlier、例3:Hadn’t you better go and see you lover ?8.用在表示祝愿的简单句中例1:Long live world peace、例2:May you best、二.虚拟语气谓语动词的几种表现形式:1.用于虚拟条件句中虚拟条件句及其主句的谓语形式可归纳如下:从句谓语主句谓语与现在事实相反 were, did would (should, could, might) + v、与将来事实相反 should do, would (should, could, might) + v、(可能性极小) were+to+v、与过去事实相反 had done would (should, could, might) + have done例1:I could definitely see the final score if I had the time、例2:How nice it would be if you could bring a gift、例3:Thay might have arrived on time if the car haven’t broken down on the road、如果条件从句中包含有were, had, should或could,有时可把if省略掉,但这时要把were, had, should或could放在主语前面(这种结构在口语中较少使用)。
英语虚拟语气在从句中的用法及其表达方式
英语虚拟语气在从句中的用法及其表达方式摘要虚拟语气是一种特殊的动词形式，用来表示说话人所说的话不是事实，而是一种假设、愿望、怀疑、建议、猜测、可能或纯粹的空想等。
虚拟语气在英语中有多种表达方式，可以用于不同类型的从句中，如条件从句、名词性从句、状语从句、定语从句等。
本文将介绍虚拟语气在从句中的基本用法和常见句型，并给出相应的例句。
一、虚拟语气在条件从句中的用法条件从句是由连词if或其他连词引导的表示条件或假设的从句。
条件从句可以分为四种类型，分别对应不同的虚拟语气形式：类型条件从句主句含义例句真实条件if + 一般现在时一般将来时/情态动词+动词原形表示可能发生或实现的情况If it rains tomorrow, we willstay at home.与现在事实相反if + 一般过去时/过去进行时would/could/might/should+动词原形表示与现在事实相反或不可能实现的假设If I were you, I would studyharder.与过去事实相反if + 过去完成时/过去完成进行时would/could/might/should+have+过去分词表示与过去事实相反或无法改变的假设If he had studied harder, hewould have passed theexam.与将来事实相反if + should/were to+动词原形/一般过去时would/could/might/should+动词原形表示对将来不太可能发生或实现的假设If I should win the lottery, Iwould travel around theworld.二、虚拟语气在名词性从句中的用法名词性从句是指在句子中充当名词功能的从句，包括主语从句、宾语从句、表语从句和同位语从句。
名词性从句中可以使用虚拟语气来表示说话人的愿望、建议、命令、要求等。
1. 虚拟语气在宾语从句中的用法宾语从句是指在复合句中作主要成分动词或介词的宾语的从句。
一坚持二命令三建议四要求的虚拟语气
e.g.The doctor advised that he (should) take more exercise. 医生建议他多锻炼。 His health required that he (should) go to bed early. 他的 健康状况要求他早睡。
suggest表“暗示，表明”，insist表“坚持认 为，坚持说”时，不用虚拟语气。
1、表示“命令”、“建议”、“要求”、“坚持”等词后所带的 名词从句用虚拟语气，结构都是：（should） + 动词原形，其 中should可以省略。 记忆口诀：
一坚持：insist 二命令：order／command 三建议：advise／suggest／recommend 四要求：demand／require／request／ask
6. Her expression suggested that she be angry. 7. They insisted the boy went with them.
____w__a_s ____ __(s_h_o_u_l_d_) _g_o_
4、在主语从句中： It is suggested/required/ordered/… that + 主语 + （should） + 动词原形； It is important/strange/necessary/…that + 主语 + （should） + 动 词原形；
1. The order is that everyone_(_sh_o_u_l_d_) _g_iv_e (give)a five-minute
talk in class.
2.His smile suggested that he h_a_d__s_u_cc_e_e_d_e_d (succeed)in this
虚拟语气15种句型
3.as if / as though后的表语或状语从句 (与wish相同)
含义 动 词 形 式
例句
现在 did / were
He looks as if he knew the little girl.
过去 Have done
It appeared as if nothing had
happened.
5.动词形式为(should)+do 的虚拟
2. It’s + adj.+that 的主语从句 (adj: necessary / essential/
important / natural / strange / possible / impossible
eg. It is important that we should attend the meeting.
• 对过去的猜测 • 肯定 must have done • 否定 can / could not have done • 可能 may / might have done
• 本应该做（实际没有做，有责备意思） • should have done • shouldn’t have done • 本来有必要作（实际没有做，不含责
desire 命令：order / command/ 坚持：insist 不管是动词还是名词，不管是主动还是被动
，不管是引导主语从句， 宾语从句， 表语 从句还是同位语从句， 都要用（should） do
5.动词形式为(should)+do 的虚拟
• My suggestion is that we should listen to his opinion first.
It is time that we stopped work and went home.
虚拟语气超详细讲解
虚拟语气超详细讲解虚拟语气类型一、(should)+do1、<无论词性，无论其从句，一律用should+do, should可省略>建议advise, suggest, propose,recommendn命令order, command请求ask, demand, require, request坚持insist 敦促urge 希望desire 指示direct**suggest表“暗示”insist表“坚持认为”不用虚拟语气The man insisted that he had never stolen the moneyThe smile on his face suggested that he had passed the examination.I suggested that he __________(stay)where he is.It is suggeated that he __________where he is.My suggestion is that he _________where he is.My suggestion that he ________where he is has been accepted.2、It is/was + 紧急，重要，奇怪/建议，要求，命令(带感情色彩)+that从句①important,natural,strange ,necessary，surprised, crucial, essential,②requested/suggested/desired/pro posed/ recommended/orderedIt is ordered/important that we (should) stay where we are.类型二Were 型虚拟语气基本原则：对现在虚拟：过去时did/were对过去虚拟：过去完成时had done对将来虚拟：过去时did/were to do或者would, might, could ＋动词原形1. if 条件句中的虚拟时间从句谓语形式主句谓语形式将来动词过去式(be用were)should + 动词原形were to + 动词原形would / should / might / could + 动词原形现在动词过去式(be 用were) would / should / might / could + 动词原形过去had +动词过去分词would / should / might / could have + 动词过去分词1.1 与现在事实不一致，其句型为：If +主语＋did ，主语＋should （could, would, 或might ）＋do .If I were you, I would study hard. （可倒装）If it rained, I would not be here now.1.2 与过去事实不一致，句型为：If +主语＋had ＋done ，主语＋should （could, would, 或might ）＋have ＋done. If the doctor had come last night, the boy would have been saved. （可倒装）1.3 将来事实不一致，句型为：If should were to 主语＋＋do ，主语＋should （could ，would, 或might ）＋do. If it should rain tomorrow, we would stay at home.（可倒装）If I were to go to the moon one day, I could see it with my own eyes.（可倒装） If you missed the film to night, you would feel sorry.（混合虚拟）难点：①在条件句中如果出现were, had, should 可省去if ，将主语与这些词倒装 Had the doctor come last night , the boy would havesaved.Were I to go to the moon one day , I would see it with my own eyes.Should it rain tomorrow , we would stay at home.②当条件状语从句表示的行为和主句表示的行为所发生的时间不一致时，被称为“错综时间条件句”，常常表现为if+过去虚拟+主句现在虚拟If you had followed my advice, you would be better now.If you had studied hard before, you would be a college student now.2. wish 后面的宾语从句中与现在愿望不一致: 主语＋did ； I wish I were you.与过去愿望不一致: 主语＋had ＋done ；I wish I had visited the white House when I was in the states.与未来愿望不一致: 主语＋would （could ）＋do 。
情态动词的虚拟语气中，只有哪个可以倒装？
情态动词的虚拟语气中，只有哪个可以倒装？情态动词的虚拟语气中，只有哪个可以倒装？在有情态动词的虚拟语气条件句中，只有should可以倒装。
倒装时，把should移至句首，去掉if。
例如：If you should prepare to go there ,I should go with you.= Should you prepare to go there ，I should go with you. 如果你准备去那里的话，我就和你一块去。
若虚拟语气条件句中有动词were,should或had, 都可以把这三个词放在主语之前,去掉if,变成倒装句。
例如：If I were a bird,I would fly.=Were I a bird,I would fly.如果我是一只小鸟，我就会飞翔。
If we were confident ,we would be able to overe all difficulties.= Were we confident ,we would be able to overe all difficulties.如果我们有信心，就能够克服所有的困难。
If he should agree to go there, we would send him there.=Should he agree to go there, we would send him there. 要是他答应去的话，我们就派他去。
If you had e，we wouldn't have been so busy.= Had you e yesterday, we wouldn't have been so busy.如果你昨天来的话，我们就不会那么忙了。
If I had enough time, I would go to his help.= Had I enough time, I would go to his help.如果我有足够的时间，就去帮助他。
虚拟语气should do结构
虚拟语气should do结构摘要：1.虚拟语气的定义与用法2.should do 结构的含义3.should do 结构的使用场景4.should do 结构与其他类似结构的区别5.should do 结构在实际语境中的运用正文：虚拟语气是英语语法中的一个重要概念，它表示与事实相反或者与现在或将来事实可能不同的情况。
在虚拟语气中，should do 结构是一种常见的表达方式，用来表示应该做的事情或者本应该做的事情。
should do 结构由情态动词should 和不定式to do 构成，其中should 可以省略。
这个结构表示说话者认为某人应该做某事，但事实上并没有做。
例如：“You should study harder.”（你应该更加努力学习。
）should do 结构在使用时有以下几种场景：1.表示建议：当说话者希望对方做某事时，可以使用should do 结构。
例如：“You should go to the doctor.”（你应该去看医生。
）2.表示批评：当说话者认为对方没有做应该做的事情时，可以使用should do 结构。
例如：“You should have finished your homework before watching TV.”（你应该在看电视之前完成作业。
）3.表示可能性：should do 结构可以表示某种可能性，例如：“It shouldrain soon.”（很快会下雨。
）should do 结构与其他类似结构有所区别。
例如，与“will do”结构相比，should do 结构表示的是应该做的事情，而will do 结构表示的是将要做的事情。
此外，与“might do”结构相比，should do 结构表达的是更加强烈的建议或批评。
在实际语境中，should do 结构可以用来描述各种情况，例如对他人的期望、对自己的要求以及对未来的预测。
掌握好should do 结构，有助于我们更加准确地表达自己的想法和观点。
should 的用法
should 作为情态动词，可以用在条件状语从句中，表示语气较强的假设，译作“万一”、“竟然”，这时也可将should 置于从句之首，即将should 放在主语前面，而省略从属连词if .例如：1) If anyone should come, say I am not at home.= Should anyone come, say I am not at home. 万一有人来访，就说我不在家。
2) If it should rain tomorrow, I wouldn't go.= Should it rain tomorrow, I wouldn't go. 万一明天天下雨，我就不去了。
should 用法汇总：1. should 作为助动词shall 的过去式，可以在间接引语中与第一人称主语搭配，表示过去将来时间。
例如：1) The group leader announced that we should（= would）begin to work soon.小组长宣布：我们不久就开始工作。
2) A week ago, I told him that I should（= would）go to Beijing the next day.一个星期以前，我告诉他我第二天就去北京。
2. should 作为情态动词，通常用来表示现在或将来的责任或义务，译作“应该”、“应当”，这时它可以和ought to, be supposed to 互换使用。
例如：1) You should（= are supposed to ）complete your test in time.你们应该按时做完你们的实验。
2) You should（= ought to ）tell your mother about it at once.你应该立即把此事告诉你妈妈。
3. should 作为情态动词，可以用在条件状语从句中，表示语气较强的假设，译作“万一”、“竟然”，这时也可将should 置于从句之首，即将should 放在主语前面，而省略从属连词if .例如：1) If anyone should come, say I am not at home.= Should anyone come, say I am not at home. 万一有人来访，就说我不在家。
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。
虚拟语气中should何时省略
一、should何时省略(1)在表示建议,要求,命令,想法的动词后的从句里, 用should + 动词原形, should 可以省略. 如advise, agree, command, decide, demand, determine, grant, indicate, insist, order, prefer, propose, request, require, stipulate, suggest, urge, vote.常考到的是: suggest, advise, demand, require, propose, insist, order, request.例子:His doctor suggested that he (should) take short leave of absence.The author proposed that TV (should) be turned off at least one hour every day.2. 在表示建议,要求,命令,想法的名词后的从句里, 用should + 动词原形, should可以省略. 如advice, decision,agreement, command, decree, demand, determination, indication, insistence, order, preference, proposal, request, requirement, stipulation etc.例子：It was Bill’s suggestion that everyone (should) have a map.His suggestion was that everyone (should) have a map.He gave us a suggestion that everyone (should) have a map.3.在It is/was +形容词后的that 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, fitting, imperative(绝对必要), impossible, improper, important, natural, necessary, obligatory, possible, preferable, probable, recommended, urgent, vital etc.例子：It‘s natural that she (should) do so.It is essential that we (should) tell her the news.4.在lest 和for fear that(以免),in case(以防)从句中用should, should 可以省略.She walked quietly lest she (should) wake up her roommates.Have your gun ready in case we should need it.二、to have done和having done 的用法分析to have done 一般指尚未完成的完成时，属于完成时语态，而having done 强调时间上的先后顺序，一般作状语。
省略should的虚拟语气
2023
PART 01
引言
REPORTING
定义与特点
定义
省略should的虚拟语气是指在使 用虚拟语气时，省略了"should" 一词，只保留了其他部分，如 "if+动词过去完成时"。
特点
省略should的虚拟语气通常用于 表示强烈的假设或强烈的建议， 强调与现实情况的巨大差异。
重要性及应用场景
在表示建议、请求、命令等语 气时，省略should的虚拟语气 常用于表达委婉或强烈的意愿
。例如
"You should go to the doctor." (你应该去看医生。) 省略should的虚拟语气表示建
议。
"You should not eat too much sugar." (你不应该吃太多 糖。) - 省略should的虚拟语气 表示建议或警告。
killed.
3. If the plane _______ on time, we would have arrived in New
York by now.
翻译题
1. 如果他早一点出发， 现在就已经到达目的 地了。
3. 如果我有更多的时 间，我就会去旅行了。
2. 如果他昨天没有生 病，他就会来参加这 个会议了。
PART 04
省略should的虚拟语气 与其他时态的区别
现在时态
省略should的虚拟语气现在时态表示对当前情况的假设，通 常与事实相反。
例如：If I were you, I would choose this option.（如果我是 你，我会选择这个选项。）
过去时态
省略should的虚拟语气过去时态表示对过去情况的假设， 通常与事实相反。
虚拟语气语法讲义10主语从句中的虚拟语气知识点总结- 高考英语语法复习
高中英语语法学习/复习讲义虚拟语气语法知识点讲义10【精讲版·全国通用】主语从句中的虚拟语气知识点总结■ it is important that…类句型中的主语从句用虚拟语气在It is important that...句式中，其中由that引导的主语从句通常用“should+动词原形”这样的虚拟语气，其中的should在美国英语中通常省略。
如：It is important that he work hard. 他用功是很重要的。
It is important that he should know about this. 他必须知道此事。
It’s important that we (should) reply to her letter.回复她的信是重要的。
It is important that we should speah politely. 我们说话要有礼貌，这是很重要的。
注：与本句型相似的还有以下句型：1. it is necessary that…句型：It is necessary that I should return it this morning. 今天早上我就有必要还回去。
It is not necessary that everyone be a scientist. 没有必要使每一个人都成为科学家。
2. it is impossible that…句型：It is impossible that he should go home. 他不可能会回家去。
3. it is essential that…句型：It is essential that the meeting start at eight. 会议务必在8点钟开始。
It is essential that we should tell her the news. 我们有必要告诉她这个消息。
4. it is desirable that…句型：It is desirable that everything should be ready by five o’clock.最好一切在5点前准备就绪。
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.
虚拟语气考点总结
（不可省略） (常考) 虚拟语气考点总结：考点1：虚拟语气倒装，省略if 的情况：If+ 从句（should/had/were if ，将should/had/were 提前从句E.g.：1) Were he here, he would come to help us.2) Had you been here just now, you would have met her.3) Should I see him tomorrow, I would tell him about it.考点2 wish+ 考点3prefer ）表示可能实现， 也可能难以实现的愿望考点4：某些实意动词+虚拟语气在表示请求、建议、命令等动词此类动词有十个： 考点5：名词+虚拟语气此类名词有：proposal, advice, order, requirement, request, recommendation, plan, decision, demand, desire, suggestion考点6：形容词+虚拟语气It is+ adj/done(某些动词的过去分词)+主语从句+that+ V （动原）/(should) V(动原)此类形容词有：necessary, important, natural, desirable, imperative, urgent, vital, advisable, preferable, essentialE.g.: It is necessary that a high school student (should) master a foreign language.考点7：for fear that/lest/in case + (should)+ V 动原→ 以防，以免考点8：情态动词+虚拟语气must+ have done → 对过去的肯定推测should+ have done → 过去本应该做可是没有做，含有责备之意；否定→ 不该做却做了 would+ have done → 过去本来会做，因为某种原因没有做；否定 → 本来不会做，却做了 could+ have done → 本能够做，但却没做成；否定 → 本来不可能做到的事情，却做到了考点9：一些特殊句型1）I ’m sorry/surprised/disappointed +从句 + should+ V 动词原形 → 表示惊奇、怀疑、不满2）It is high/about time that +过去式/should do。
虚拟语气词should的用法
虚拟语⽓词should的⽤法我们通过⼀下的例句来讲讲虚拟语⽓词should的⽤法：1） It is demanded / necessary / a pity + that…结构中的主语从句的谓语动词要⽤should 加动词原形， should 可省略。
句型： (1) suggestedIt is (2) important that…+ (should) do (3) a pity(1)suggested, ordered, proposed, required, demanded, requested, insisted；+ (should) do(2)important, necessary, natural, strangea pity, a shame, no wonder(3)It is suggested that we (should) hold a meeting next week.It is necessary that he (should) come to our meeting tomorrow.2）在宾语从句中的应⽤ 在表⽰命令、建议、要求等⼀类动词后⾯的从句中。
order, suggest, propose, require, demand, request, insist, command, insist + (should) do I suggest that we (should) hold a meeting next week. He insisted that he (should ) be sent there. 注意：如suggest, insist不表⽰"建议" 或"坚持要某⼈做某事时"，即它们⽤于其本意"暗⽰、表明"、"坚持认为"时，宾语从句⽤陈述语⽓。
The guard at gate insisted that everybody obey the rules. 判断改错: （错） You pale face suggests that you (should) be ill. (对) Your pale face suggests that you are ill. (错) I insisted that you ( should) be wrong. (对) I insisted that you were wrong.3）在表语从句，同位语从句中的应⽤ 在suggestion, proposal, idea, plan, order, advice等名词后⾯的表语从句、同位语从句中要⽤虚拟语⽓，即（should）+动词原形。
虚拟语气在主语从句中的运用
虚拟语气在主语从句中的运用来源:星火教育网作者:文静点击:297次一、 It is (was)+ 形容词 ( 或过去分词 )+that 结构中的虚拟语气其表达形式为 should + 动词原形或省略 should 直接用动词原形。
常用的形容词：natural ( 自然的 ) ， appropriate ( 适当的 ) ， advisable ( 合适的 ) ，preferable ( 更可取的 ) ， be一、“It is (was)+形容词(或过去分词)+that……”结构中的虚拟语气其表达形式为should +动词原形或省略should直接用动词原形。
常用的形容词：natural (自然的)，appropriate (适当的)，advisable (合适的)，preferable (更可取的)， better (更好的)，necessary (必须的)，important (重要的)，imperative (急需的)，urgent (急迫的)，essential (本质的)，vital (必不可少的)，probable (很可能的)，possible (可能的)，desirable (极好的)，advisable(合理的)，compulsory(必须的)，crucial(紧急的)，desirable(理想的)，essential(必要的)，imperative(迫切的)，incredible(惊人的)，necessary(必要的)，possible(可能的)，strange(奇怪的)，urgent(紧迫的)。
常用的过去分词：required (需要的), demanded (要求), requested (被请求的), desired (要求)，suggested (建议), recommended (推荐)，orderd (命令)例：1.It is required that nobody (should) smoke here.译文：要求不要在此抽烟。
Should一词的省略用法探源
Should一词的省略用法探源
胡蓉
【期刊名称】《大理学院学报》
【年(卷),期】2005(004)002
【摘要】情态动词should在虚拟语气句型中有时可以省略,有时不能省略,其用法常常使许多英语学习者感到困惑.将时态理解为"表示动作或状态与说话时刻关系的动作词语形式",便于我们从全新角度认识现在时态、过去时态和祈使句式.在此基础上,作者从语义及句法结构两方面比较分析了should一词在两种虚拟语气句型中的不同用法,并且探究了该词的用法来源.
【总页数】3页(P83-85)
【作者】胡蓉
【作者单位】深圳大学成人教育学院,深圳,518008
【正文语种】中文
【中图分类】H314
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一、should何时省略
(1)在表示建议,要求,命令,想法的动词后的从句里, 用should + 动词原形, should 可以省略. 如advise, agree, command, decide, demand, determine, grant, indicate, insist, order, prefer, propose, request, require, stipulate, suggest, urge, vote.常考到的是: suggest, advise, demand, require, propose, insist, order, request.
例子:His doctor suggested that he (should) take short leave of absence.
The author proposed that TV (should) be turned off at least one hour every day.
2. 在表示建议,要求,命令,想法的名词后的从句里, 用should + 动词原形, should可以省略. 如advice, decision,agreement, command, decree, demand, determination, indication, insistence, order, preference, proposal, request, requirement, stipulation etc.
例子：It was Bill’s suggestion that everyone (should) have a map.
His suggestion was that everyone (should) have a map.
He gave us a suggestion that everyone (should) have a map.
3.在It is/was +形容词后的that 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, fitting, imperative(绝对必要), impossible, improper, important, natural, necessary, obligatory, possible, preferable, probable, recommended, urgent, vital etc.
例子：It‘s natural that she (should) do so.It is essential that we (should) tell her the news.
4.在lest 和for fear that(以免),in case(以防)从句中用should, should 可以省略.
She walked quietly lest she (should) wake up her roommates.
Have your gun ready in case we should need it.
二、to have done和having done 的用法分析
to have done 一般指尚未完成的完成时，属于完成时语态，而having done 强调时间上的先后顺序，一般作状语。
加doing一般表示正在做，或者是想待会做，而加to do 表示想做，但可能做不了。
这个要看具体语境。
doing 现在分词；having done 现在分词的完成式，强调分词动作先于谓语动作发生。
to do不定式一般式；to have done 不定式完成式，表明不定式动作先于谓语动作发生。
having done：完成式；现在分词的完成式；现在分词的完成形式；强调时间完成式
由于现在分词和动名词都是在动词之后加-ing构成的,所以两者的被动式
(being done)、完成式(having done)及完成被动式(having been done)是相同的。
现在分词的完成式
现在分词的完成式(having done):表示分词的动作发生在谓语动词的动作之前.如:
现在分词的完成形式
现在分词的完成形式（having done）现在分词的完成式表示的动作在句中谓语动词动作之前发生，具有主动意义。
强调时间
（for having interrupted强调interrupt这个动词先发生，强调时间 (having done)）以上两者为时间概念不同，意思相同
-having been done：完成被动式；完成式；被动语态；被动形式
完成被动式
现在分词和动名词都是在动词之后加-ing构成的，所以两者的被动式（beingdone）、完成式（havingdone）及完成被动式（having been done）是相同的。
完成式
过去分词短语作状语可分为：一般式(done)：表示分词动作与谓语动作同时发生或分词动作发生于谓语动作前；完成式(having been done)：强调分词动作发生于谓语动作之前。
被动语态
现在分词一般式的被动语态(being done)表示某被动动作正在进行；现在分词完成式的被动语态(having been done)表示某被动动作发生在谓语动作之前。
如：
被动形式
现在分词完成式的被动形式（having been done），与主语形成被动的主谓关系，
发生在谓语动作之前。
②独立主格结构如果分词状语的动作与句子的主语没有逻辑意义的主谓关系， ...
-I deny ever having done such a thing.：我否认做过那样得事情
Now I regret having done that.
我现在后悔这样做了。
have done[口语] 了结，做完，结束(Have done!) 停止!够了!算了吧! Having done their homework, the students played football.
学生们做完作业后，就去踢足球。
What are you most proud of having done? What would you make you even more proud?
你迄今做过的最让你自豪的事是什么？你该做些什么才能让你更为自豪呢？
to have done 就是完成时，不过完成时还可以细分为过去完成时，现在完成时，和将来完成时。
在下面例句中，We are going to have learnt 9000 words by the end of the next term.就明显是将来完成时。