should在虚拟语气中的用法 求虚拟语气的用法，特别是should型虚拟。

求虚拟语气的用法，特别是should型虚拟。  

求虚拟语气的用法，特别是should型虚拟。

一.should 在含有条件的虚拟语气中的运用
1. 虚拟现在时表示与现在事实相反的假设，其if 从句的谓语形式用动词的过去式(be 一般用were)，主句用would/ should/ could/ might +动词原形。
I’d e too if I had time to spare.
2.虚拟过去时是表示与过去事实相反的假设，if 从句的谓语形式用过去完成时即had＋过去分词，主句用would / should / could / might + have +过去分词。
If the hurricane had happened during the daytime there would have beenmore deaths.
3.虚拟将来时是表示对将来实现的可能性很小的或不确定的假设。If从句的谓语形式用一般过去式或用were to / should +动词原形，主句用would /should /could/ might +动词原形。
If I were to met him tomorrowshould, I should ask him about it.
Should there be any trouble with the boiler, the automatic controlling unit would cut off the fuel oil supply.
If there were no gravity, we should not be able to walk.
二.should在宾语从句中的运用.　
1)某些动词后所接宾语从句中的谓语动词要求用虚拟语气，用来表示建议、命令和要求等。其形式为：（should）+ 动词原形。常这样用的动词有ask 要求 advise 劝告　determine 决定 decide 决定mand 命令 insist 坚持intend 打算 move 提议prefer 宁愿 propose 提议order 命令 remend 推荐request 要求 require 要求suggest 建议 urge 主张demand要求 desire 渴望direct 命令.例如：
He insisted that the meeting be put off.
他要求推迟那个会议。
He insisted that he was right
.他坚持认为他是对的.
They proposed that all the plans (should) be discussed at the meeting.
他们建议所有的计划都应该在会上讨论。
2） 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）+ 动词原形。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。例如：
We think it advisable that he (should) think deeply before acting.
我们认为他在行动之前好好考虑一下才是明智的。
3)expect,believe,think,suspect等动词的否定或疑问形式的宾语从句.中谓语动词用should+动词原形.
I never expected that the problem should be so plicated.
They just couldn’t believe that the stadium should be so big.
We never thought that she should be the brave girl who we have heard so much about.
三.should在表语从句和同位语从句中的运用中的运用.
　在表示建议、命令、主张、目的和愿望等名词后面的表语从句和同位语从句中谓语动词要求使用虚拟语气。其形式为：（should）+ 动词原形。常这样用的名词有：resolution 决心，决议 pray 恳求decision 决议 motion 提议suggestion 建议 preference 选择proposal 提议 advice 劝告remendation 推荐 desire 愿望demand 要求 requirement 要求order 命令 necessity 必要性request 要求 idea 主意、想例如：
He gave orders that the guests (should) be hospitably entertained.
他下令热情款待这些客人。
His proposal is that we (should) get rid of the bad habits.
他提议我们应该摈弃这些不良习性。
四.should在主语从句中句的运用.
1）主语从句中的虚拟语气主要取决于某些形容词用来表示建议、命令、要求、惊异和失望等。其形式为：（should）+ 动词原形。常这样用的形容词有：appropriate 适当的 advisable 适当的，合理的better 较好的 desirable 理想的essential 精华的 imperative 迫切的important 重要的 insistent 坚持的natural 自然的 necessary 必要的preferable 优越的，较好的 strange 奇怪的urgent 紧迫的 vital 极其重要的，如：
It’s necessary that we should have a walk now. 我们有必要出去散散步。
It’s natural that she should do so. 她这样做是很自然的。
It’'s important that we should take good care of the patient. 重要的是我们要照顾好病人。
2)在句型it is a pity that 。。。it is a shame that。。。it is no wonder that。。。that 后面的从句中的谓语动词用：should+动词原型表示惊奇，怀疑，不满等情绪。
Is is a pity that he should be so coceited。真遗憾他竟然这样自高自大。
3）在句型it is desired that ，it is suggested that，it is reqested that ，it was orered that，iwas proposed that ，it has been decided that，等结构后的主语从句中，谓语动词常用(should)+动词原型。
It is suuggested that we form a spare time study group。
It is insisted that we (should) take up the question at the meeting。
五，should 在状语从句中的运用。
1）连接词“in case, lest, for fear that”可以用来引导虚拟语气。其形式通常为：“…lest (in case, for fear that) + 主语 + should + 动词原形”。Lest, for fear that 句中的 should 可以省去， in case 句中的 should 通常不省去，但是 in case 句中可以不用虚拟语气，而用陈述语气。Lest, for fear that后面也可以接其他形式。例如：
He took his coat with him in case it should rain.
他带着雨衣以防下雨。
I will not make a noise for fear that I (should/ might) disturb you.
我不会做声的，以免打扰你。
Care must be taken in using this method lest overflow (should) our.
在使用这以方法的时候要谨慎小心，以免发生溢流现象。
2）I’m sorry that…We were surprised that… They were disappointed/disappointed that..等后面的状语从句中谓语动词用should+动词原型 如:
I’m sorry that she should be in such poor health我真难过,他身体竟然这样差.
六.在how ,why 等引起的问句中也可用should.如;
Why should you talk like that?你怎样竟然这样说?
How should (could) I know?我怎末知道?
七.should 可以用来陈述自己的看法 .
I should be so glad to talk to him.我愿意和他谈谈.
Ishould think your approach is correct.我想你处理的方式是对的。
八．..should在其他句型中的运用
1）在句型“It is (high/ about) time…”后面也可以跟虚拟语气，从句中常用过去式。有时也用“（should）+ 动词原形”，意为“该是……的时候了”。例如：
It is time that the boy (should) go to school.
这个小孩该上学了。
　It is high time (that) the weather improved.
天气真该好起来了。
2). should have done sth本应该做某事，而事实上并没有做。否定句表示"不该做某事而做了"。
You ought to (should) have been more careful in this experiment　
在这个实验中你本该要小心的。（事实上大意了。）
He ought not to have thrown the old clothes away.（事实上已扔了。）
ought to 在语气上比should 要强。
九.wish后的宾语从句中，if only 引起的句子,as if 引起的状语从句中一般不用should.
1) wish后面所跟的宾语从句中的虚拟语气表示某种不能实现的愿望。
其主要形式有三种：
表示对现在情况的虚拟： wish/if only/as if + 主语 + 动词过去式或 were
表示对过去情况的虚拟： wish/if only/as if + 主语 + had + 过去分词
表示对将来情况的虚拟： wish /if only/as if + 主语 + would + 动词原形。
例如：
I wish I knew what was going to happen.
但愿我能知道要发生什么事。
She wished she had stayed at home.
她懊悔的是她当时要是在家就好了。
　I wish I were rich.
我恨不得我很有钱。
注意：在表示对过去情况的虚拟时，有时也可以用下列形式：
wish + 主语 + would（could）+ have + 过去分词
I wish I could have seen her last night.
要是我昨天晚上能够见到她那该多好。
If only the alarm clock had rung.　当时闹钟响了，就好了。
　If only I were you！我是你就好了!
2）as if从句的虚拟语气用法： as if的意思是“好像”，从用法上有两种:如果是假象用虚拟语气,如果有可能发生用陈述语气.如:
Tom looks calm and steady as if he were telling the truth.
Tom looks calm and steady as if he is telling the truth.
前一句表明汤姆是在撒谎，后一句说明汤姆可能在撒谎。
He speaks as if he knew everything about the aident.(虚拟)
He speaks as if he knows everything about the aident.(陈述)
My mother is always talking as if she were a doctor of medicine.(虚拟)
The young lady is talking as if she is a doctor of medicine.（陈述）
You seem as if you had done all that you should have.(虚拟)

should虚拟语气的用法

1．虚拟语气在条件句中的用法
（1）若表示与现在事实相反的假设,则条件从句中用过去式,主句中用过去将来式（would,should,could,might + 动词原形）；若表示某事将来实现的可能性不大,则条件从句中用should + 动词原形也可用“were to+动词原形”或用过去式动词.如：
I would certainly go if I had time．（现在）
If it should rain,we wouldn”t go out.（将来）
If I knew German,I would read the paper to you．（现在）
If he were here,we could ask him．（现在）
（2）若表示与过去事实相反的假设,从句中用过去完成式,主句中用过去将来完成式（should,would,could,might + have + 过去分词）.如：
If I had set off a little earlier,I would have caught the train．
She would / might have e if she hadn”t been so busy．
If I hadn”t taken your advice,I would have made a bad mistake．
If only you hadn”t told him the news．
（3）含有虚拟语气的条件状语从句中,如有had,should,were 这三个词的话,在正式或书面语言中可将if省略,再将句子的主语和谓语动词实行全部倒装或部分倒装.如：
Had they time（=If they had time）,they would certainly e and help us．
Should it be fine（=If it should be fine）,we would go for an outing．
Were I go（=If I were you）,I would go．
（4）若主句从句所指的时间不一致,即条件从句表示与过去事实相反,主句表示与现在事实相反；或者条件从句表示与现在事实相反,主句表真实情况,则从句中应采用与具体时间相对应的虚拟形式.如：
If it had rained last night（过去）,It would be very cold today（现在）．
If I had taken your advice（过去）,I should have no trouble with the work now（现在）．
2．虚拟语气在宾语从句中的用法
在动词suggest,order,demand,propose,request,mand,insist等后的宾语从句中,用虚拟语气（即Should+动词原形或只用动词原形）来表示愿望、建议、命令、请求等.在动词wish /would rather后的宾语从句中,用过去式表示与现在事实不符,用过去完成式表示与过去事实不符.如：
I suggest that we（should）set off at once．
The doctor insisted that the patient (should)be X-rayed．
I wish I were as strong as you．
would rather that you hadn”t told him．
3．虚拟语气在主语从句中的用法
在It is necessary/important/strange/natural；It is requested/suggested/desired/proposed；it is a pity等结构后的主语从句中要用虚拟语气,即Should+动词原形或只用动词原形.如：
It is necessary that he（should）be sent there at once．
It is requested that Professor Li（should）give us a speech．
It is desired that we（should）get everything ready by tonight．
4．虚拟语气在表语从句、同位语从句中的用法.
在 suggestion,proposal,idea,plan,order,advice等名词后的表语从句、同位语从句中要用虚拟语气,即should+动词原形或只用动词原形.如：
Our suggestion is that you（ should）be the first to go．
My advice is that we（should）send for Doctor Li．
Do you know the order that you（should）keep watch?
5．虚拟语气在其他状语从句中的用法
在as if引导的状语从句中,用过去式表示与现在事实不符,用过去完成式表示与过去事实不符；在so that,in order that引导的状语从句中,常用should/would/could/might+动词原形来表示虚拟语气.如：
They talked as if they had been friends for years．
She stayed at home for a few days so that she could take care of her mother．
He took a taxi to the station so that she should not miss the train．
6．虚拟语气在定语从句中的用法：
在it is time后面的定语从句中常用过去式表示虚拟

虚拟语气的用法

虚拟条件句的三种基本类型：与现在事实相反、与过去事实相反、与将来事实相反。
条件句有真实条件句和非真实(虚拟)条件句两种。真实条件句所表示的假设是有可能发生的，而非真实条件句则通常表示一种假想，与事实相反或不大可能会发生：
If I have time, I will go with them. 假若我有时间，我就同他们去。(陈述语气)
If I were you, I would go with them. 假若我是你，我就同他们去。(虚拟语气)
▲ 与现在事实相反
若与现在事实相反，条件从句的谓语用过去式(be通常用were)，主句谓语用“should (would, could, might)+动词原形”：
If I knew her number ，I could ring her up. 要是我知道她的电话号码，我就可以给她打电话了。(可惜我不知道)
▲与过去事实相反
若与过去事实相反，条件从句的谓语用过去完成时(had+过去分词)，主句谓语用“should (would, could, might)+have+过去分词”：
If I’d left sooner，I’d have been on time. 要是我早点动身，我就准时到了。(但我动身太迟了)
▲与将来事实相反
若与将来事实相反，条件从句的谓语用过去式(be通常用were)，主句谓语用“should (would, could, might)+动词原形”：
If I asked him，I’m sure he’d help us. 如果我向他提出要求，肯定他会帮助我们。(不过我不打算这样做)
注：几点特别说明
① 主句谓语中的should主要用于第一人称后。would, might, could的大致区别是：would表示结果，might表示可能性，could表示能力、允许或可能性。比较：
If you tried again ，you would sueed. 要是你再试一试，你就会成功的。(would表结果)
If you tried again， you might sueed. 要是你再试一试，你可能会成功的。(might表可能)
If you tried again ，you could sueed. 要是你再试一试，你就能成功了。(could表能力)
④ 对于与将来事实相反的情形，请注意以下几点：一是这里说的与将来事实相反，实为对将来情况的推测；二是此用法中的条件从句谓语除用过去式外，有时也用“should+动词原形”(表示可能性极小，常译为“万一”)或“were to+动词原形”(表示与将来事实相反的假设)；三是当条件从句使用“should+动词原形”这样的谓语时，主句谓语除可用“should (would, could, might)+动词原形”这样的虚拟语气外，也可用直陈语气或祈使语气：
If it should rain tomorrow, don’t expect me. 万一明天下雨，就不要等我了。（祈使语气）
If I should see him, I’ll tell him. 万一我见到他，我就告诉他。（直陈语气）
2、错综时间虚拟条件句
所谓错综时间虚拟条件句即条件从句与主句所指时间不一致，如从句指过去，而主句即指的是现在或将来，此时应根据具体的语境情况，结合上面提到的三种基本类型对时态作相应的调整：
If it had rained last night, the ground would be wet now. 要是昨晚下过雨的话，现在地面就会是湿的。
You would be much better now if you had taken my advice. 假若你当时听我的话，你现在就会好多了。
3、两个常考虚拟语气句型
▲ 句型介绍
这两个句型是If it weren’t for…和If it hadn’t been for…，这是两个很常用的虚拟语气句型，也经常受到命题人的青睐，其意为“若不是(有)”“要不是有”。如：
If it weren’t for water, no plant could grow. 要是没有水植物就无法生长。
If it hadn’t been for your assistance ，we wouldn’t have sueeded.
=But for your assistance ，we wouldn’t have sueeded.
=Without your assistance ，we wouldn’t have sueeded.
5、wish后宾语从句用虚拟语气
▲ 用法说明
动词wish后接宾语从句时，从句谓语要用虚拟语气。若要表示与现在事实相反的愿望，从句谓语用一般过去时或过去进行时；若表示与过去相反的愿望，从句谓语用过去完成时或would / could+have +过去分词；若表示将来没有把握或不太可能实现的愿望，用would (could)＋动词原形。如：
注：特别注意
从句的时态只与从句所指的时间有关，而与wish的时态无关，比较：
I wish I were rich. 要是我现在有钱就好了。
I wish I had been rich. 要是那时我有钱就好了。
I wished I were rich. 当时我后悔自己没有钱。
I wished I had been rich. 当时我后悔自己曾经没有钱。
6、if only后的句子用虚拟语气
if only 与 I wish一样，也用于表示与事实相反的愿望，其后所虚拟语气的时态与 wish后所接时态的情况相同：
If only she had had more courage! 她再勇敢一些就好了。
If only I had listened to my parents! 我要是当时听了父母的话就好了。
If only she would go with me! 她要是愿意和我一道去就好了!
注：if only 通常独立使用，没有主句。
7、as if (though) 从句用虚拟语气
▲ 基本用法
以as if (as though)引导的方式状语从句或表语从句，有时用虚拟语气，若表示与现在事实相反，谓语动词用一般过去时；若表示与过去事实相反，用过去完成时；表示将来的可能性不大，用would (might, could)+动词原形：
He acts as if he knew me. 他显得认识我似的。
They treat me as though I were a stranger. 他们待我如陌生人。
He talks as if he had been abroad. 他说起话来好像曾经出过国。
注：两点说明
(1) 从句所表示的内容若为事实或可能为事实，也可用陈述语气：
It looks as if we’ll be late. 我们似乎要迟到了。
(2) 注意 It isn’t as if…的翻译：
It isn’t as if he were poor. 他不像穷的样子(或他又不穷)。
8、It’s time后的从句用虚拟语气
▲ 基本用法
从句谓语通常用过去式表示现在或将来，有时也用过去进行时或“should+动词原形”(较少见，且should不能省略)，其意为“(早)该干某事了”：
It’s time we went [were going, should go]. 我们该走了。
It’s time I was in bed. 我该上床睡了。(不用were)
9、would rather后句子用虚拟语气
在would rather, would sooner, would just as soon 后的that从句中, 句子谓语习惯上要用虚拟语气， 表示”宁愿做什么” ，具体用法为：
▲ 一般过去时表示现在或将来的愿望
I’d rather you went tomorrow (now). 我宁愿你明天(现在)去。
▲ 用过去完成时表过去的愿望
I’d rather you hadn’t said it. 我真希望你没有这样说过。
10、宾语从句用虚拟语气的10种类型
▲ I wish后的宾语从句
动词wish后接宾语从句时，从句谓语要用虚拟语气。若要表示与现在事实相反的愿望，从句谓语用一般过去时或过去进行时；若表示与过去相反的愿望，从句谓语用过去完成时或would / could+have +过去分词；若表示将来没有把握或不太可能实现的愿望，用would (could)＋动词原形。如：
I wish I could be of some use. 我希望我能有什么用处。
We wish he didn’t smoke. 我们希望他不吸烟。
I wish prices would e down. 我希望物价能降下来。
▲ 表示“坚持”后的宾语从句
主要是指insist的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
I insisted that he (should) stay. 我坚持要他留下。
注：动词insist后接宾语从句时，除可用虚拟语气外，也可用陈述语气，两者的区别是：若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。比较：
He insisted that I had read his letter. 他坚持说我看过他的信。
He insisted that I should read his letter. 他坚持要我看他的信。
▲ 表示“命令”后的宾语从句
主要是指order, mand的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
He ordered that it (should) be sent back. 他命令把它送回去。
▲ 表示“建议”后的宾语从句
主要是指advise, suggest, propose, remend等的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
He suggested that we should leave early. 他建议我们早点动身。
注：与动词insist相似，动词suggest后接宾语从句时，除可用虚拟语气外，也可用陈述语气，两者的区别也是：若谓语动词所表示的情况尚未成为事实，则用虚拟语气，此时suggest通常译为“建议”；若谓语动词所表示的情况为既成事实，则要用陈述语气，此时的suggest通常译为“表明”、“认为”。比较并体会：
He suggested that we (should) stay for dinner. 他建议我们留下吃饭。
I suggested that you had a secret understanding with him. 我觉得你与他心照不宣。
▲ 表示“要求”后的宾语从句
主要是指ask, demand, require, request等后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
I ask that he leave. 我要求他走开。
He requires that I (should) appear. 他要求我出场。
▲ 表示“提议”“投票”后的宾语从句
主要是指move, vote等后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
I move that we aept the proposal. 我提议通过这项提案。
▲ 表示“敦促”后的宾语从句
主要是指动词urge后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
He urged that they go to Europe. 他敦促他们到欧洲去。
▲ 表示“安排”后的宾语从句
主要是指动词arrange后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
He arranged that I should go abroad. 他安排我去国外。
▲ 表示“希望”“打算”后的宾语从句
主要是指动词desire, intend后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
She desires that he do it. 她希望他做此事。
▲ 表示“指示”后的宾语从句
主要是指动词direct后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
The general directed that the prisoners should be set free. 将军指示释放那些俘虏。
11、主语从句中的虚拟语气
在It is necessary，important，strange，natural， advisable, anxious, pulsory, crucial, desirable, eager, essential, fitting, imperative(绝对必要), impossible, improper, obligatory, possible, preferable, probable, remended, urgent, vital etc. ；it is a pity；It is requested/suggested/desired/proposed等结构后的主语从句中要用虚拟语气，即Should+动词原形或只用动词原形。如：
▲ It’s important…类
这一类型主要包括It is (was) important (necessary, desirable, imperative, advisable)that. . .句型。如：
It is impossible that he should go home. 他不可能会回家去。
▲ It’s a pity…类
It is a pity that she should fare so badly. 她竟吃得这么差，真可怜。
▲ It’s desired…类
这种主语从句还常用在It is (was) desired (suggested, settled, proposed, requested, decided, etc. ) that...句型。如：
It is requested that a vote be taken. 建议付诸表决。
12、表语从句、同位语从句中的虚拟语气
在advice, agreement, mand, decision, decree, demand, determination, indication, insistence, order, preference, proposal, request, requirement, stipulation ，suggestion， idea，plan，order等名词后的表语从句、同位语从句中要用虚拟语气，即should+动词原形或只用动词原形。如：
Our suggestion is that you（ should）be the first to go． 我们的建议是你应该第一个去。
13、 在 lest ，for fear that( 以免) , in case (以防)引导的目的状语从句中的虚拟语气
在 lest ，for fear that( 以免) , in case (以防)从句中用should＋动词原形, should 可以省略.
She walked quietly lest she (should) wake up her roommates. 她走得很轻以免吵醒她的室友。
为方便记忆，表格对比
使用虚拟语气的主要句型 谓语动词的虚拟形式 例句
表现在的虚拟条件句 从句：用动词过去（be 多用were ） 1. If I were you, I should study English.
2. I would certainly go if I had time.
主句：would/should/could/might+动词原形
表过去的虚拟条件句 从句：had + PP 1. If you had taken my advice, you would not have failed in the test.
2. If I had left a little earlier, I would have caught the train.
主句：would/should/could/might +have + PP
表将来的虚拟条件句 从句：①用动词过去②should +V原③（were +to do ） 1. If it were to rain tomorrow, the meeting would be put off.
2. If you came tomorrow, we would have the meeting.
主句：would/should/could/might +have + PP
省略 if 的条件句 从句：用倒装形式，即把were,had等置于句首。(并只限were/ had)
主句：根据虚拟的情况采取与从句相应的形式。 1. Were I in school again(= If I were in school again, I would work harder.)
2. Were it not for the rain, (不能说Weren’t it for the rain, ) I would go swimming.
错综时间条件句（从句与主句所表示时间不一致） 根据从句与主句表示的不同时进行调整。 1.If you had worked hard yesterday, you would be tired now
2. If we hadn’t been working hard in the past few years, things woud be going so smoothly.
含蓄条件句（虚拟条件暗含在短语或上下文之中，从句不表现出来）(常见有but for“要不是” without等) 根据句子表达的实际情况选用相应的虚拟条件句中的主句的动词形式 1.Without air, there would be no living things.
2.I would have given you more help, but I was busy now.
名词性从句中的虚拟语气
wish, “可惜……”“……就好了”，“悔不该……”“但愿……” wish后从句：与表各种时间的虚拟条件句中的从句动词形式基本相同。
具体：1，表与现在不能实现的愿望，从句用“过去时，be 用were”
2.表与过去不能实现的愿望，从句用“had+PP 或 could/would +have +PP“
3. .表与将来不能实现的愿望，从句用“could/would +动词原形”
1.I wish I were a bird.
2. I wish I had known the answer..
would rather 后的宾语从句 would rather后从句：动词常用过去式 1. I would rather they came tomorrow
demand, insist,suggest, mand, order, require, request, desire等一类动词后的宾语从句
（suggest表“暗示、隐含等”insist表“强调，力言等”不用虚拟语气。） 从句谓语用“should+动词原形”，should可省。 1. I suggest you (should)go at once.
2. He suggested that he patient’s leg should be cut and this suggested that he was not good at the case.(注意两个suggest的准确翻译)
“It is (was)+上述demand/suggest等动词过去分词（或important,natural,strange ,necessary等形容词）”后的主语从句 从句谓语用“should+动词原形”，should可省。 1. It ordered that the army (should) get there by 4 a.m.
2. It is necessary that she (should) be sent there at once.
order,suggestion,idea,plan, proposal, advice, demand等名词后的表语从句或同位语从句 从句谓语用“should+动词原形”，should可省。 His demand is that we (should )finish the work in 3 hours.
特殊形式的虚拟语气
as if 引导的从句（表示非真实时）但表真实时，不用虚拟语气。 与虚拟语气条件中从句动词形式基本相同。 1.Tom speaks as if he were a girl.
2.He looks as if he had been to Beijing.
so that, in order that引导的目的状语从句 May/might/should +V原 I live so that others may live better.
It is (the very/high)time that后的定语从句 从句谓语动词常用过去式，有时也可用should+动词原形 It is (high)time that we went (should go) to bed.
It is time that I were leaving.
省去主句的If only(要是……就好了)虚拟条件句 与wish后的宾语从句谓语形式相同。 If only I hadn’t lost the chance!
(= I wish I hadn’t lost the chance)
某些表祝愿的句子 常用原形或“May+动词原形” Long live world peace!
May you be happy1
表委婉客气的是常语句 情态动词的过去式+动词原形 Could I borrow your bike?
Would you please give me a hand?
虚拟语气的用法
虚拟语气表示一种假设的情况，或一种主观的愿望，即动词所表示的动作或状态并非事实，或不可能实现。英语虚拟语气的形式有下列几种：
一、与现在事实相反
连接词 条件从句 结果从句
If 1.动词过去式(或were)
2.助动词（过去式）+动词原形 Should
Would +动词原形
could
might
If had the time, John would make a trip to China to see the Great Wall.
If I were you, I would give up drinking immediately.
二.与将来事实相反
连接词 条件从句 结果从句
If 1. should+动词原形
2. 动词过去式
3、were to+动词原形 Should
Would +动词原形
could
might
If you should lose, what would you do?
If I were to see her tomorrow, I would tell her thetruth.
If you went there next time, you would see what I mean.
三、与过去事实相反
连接词 条件从句 结果从句
If had+过去分词 Should
Would + have+过去分词
could
might
If I’d dnown that it was going to rain, I would never have gone for a walk in the country.
四、虚拟语气的几种特殊用法
省掉if的条件从句结构：
Had you asked me, I would have told you. (=If you had asked me,…)
2.有时虚拟条件不用条件从句而用不定式、分词、介词、名词、连接词或定语从句来表示，如：
A true friend would not do such a thing.
(=If he were a true friend, he...)
(=If there were no water,…)
(=If you hadn’t helped me,…)
3. 有时条件从句中的动作和结果从句中的动作发生的时间不一致，如：
If he had followed the doctor’s advice, he would be quite all right now.
If I were you, I would have gone home.
五、虚拟语气的其他用法
1、Suggest, advise 等动词之后宾语从句须用虚拟语气，其句子结构如下：
suggest, advise, remend, demand,
require, insist, urge, request, order, +that…(should )+动词原形
devide, ask, move, propose等
注意：在此结构中that不可省略；should省不省均可。
He suggested that they (should ) s smoking.
上述动词的名词形式出现时，that 引导的从句仍用虚拟语气。
He made a request that they (should ) s smoking.
如果that 引导的从句所表达的内容是事实，也可用陈述语气。
He insists that he is right.
2、It is (was )+necessary, a pity 等+that引导的从句须用虚拟语气，其句子结构如下：
imperative, advisable, 动词完成式
It is (was) + important,natural, necessary, +that…(should) +
essential, strange,等 动词原形
It is important that you (should) follow the doctor’s orders.
It is right that you should have done your homework.
3、wish的用法
动词过去式或were—与现在事实相反
主语+wish(that)+主语 + 动词过去完成式—与过去事实相反
助动词过去试+动词原形—与将来事实相反
I wish I were a pop singer. (=I am sorry I am not a pop singer..)
I wish I had never sped teaching. (=I am sorry I sped teaching.)
I wish they’d let us get some sleep.
注意：wish与hope接宾语从句的区别在于：hope表示一般可以实现的希望，宾语从句用陈述语气。wish表示很难或不大可能实现的希望,宾语从句用虚拟语气。试比较：
（1） We hope they will e,(We don’t know if they can e.)
（2） We wish they could e,(We know they are not ing.)
4、as if, as though, would(had) rather(that)引导的从句须用虚拟语气，如：
He acts as if nothing had happened.
I would rather you didn’t tell him.
5、It’s (high) time that…+动词过去式或should+动词原形，如：
It’s time (that) you had a hair cut.
It’s high time (that) we took some action.

if虚拟语气的用法！

if引导的虚拟条件句中如果有should,were,had时，可以把should,were,had提前，if省略，句子倒装。拟语气在as if/as though、even if/even though等引导的表语从句或状语从句中，如果从句表示的动作发生在过去，用过去完成时；指现在状况，则用一般过去时；指将来状况则用过去将来时。</FONT>