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虚拟语气的用法（附用法规律+语法作业）
虚拟语气是说话者用来表示假设，或难以实现的情况，而非客观存在的事实，所陈述的是一个条件，不一定是事实，甚至完全与事实相反。以下是小编为大家收集的虚拟语气的用法，欢迎阅读与收藏。
| 【1】虚拟语气用法总结 | 【4】其他句型中的虚拟语气 |
| 【2】条件句中的虚拟语气 | 【5】虚拟语气的十一条规律 |
| 【3】虚拟语气在各种从句中的用法 | 【6】虚拟语气的语法作业 |
虚拟语气用法总结
一、虚拟语气的使用范围：
虚拟语气用来表示说话人所说的话并不是事实，而是一种假设、愿望、怀疑或推测。该语法主要用于if 条件状语从句中，也可用于主语从句、表语从句和宾语从句等。
二、虚拟语气的判断：
1、if 条件状语从句中虚拟语气的判断。
if 条件状语从句有真实条件句和非真实条件句。假设条件可以实现的句子为真实条件句，反之为非真实条件句，要用虚拟语气。其形式分为以下三种：
(1) 与过去事实相反的假设。结构为：从句的谓语动词用“had + 过去分词”，主句用“should (would, could, might) + have + 过去分词”。例如：
If it had not rained so hard yesterday, we could have played tennis. 如果昨天没有下大雨，我们就能玩网球了。
(2) 与现在事实相反的假设。结构为：从句的谓语动词用过去式，系动词用were，主句的'谓语用“should (would, could, might) + 动词原形”。例如：
If I were in your position, I would marry her. 如果我是你，我就娶她为妻。
(3) 与将来事实相反的假设。结构为：从句的谓语动词用“should (were to) + 动词原形”，主句用“should
(would, could, might) + 动词原形”。 例如：
If you should miss the chance, you would feel sorry for it. 如果你错过了这次机会，你会难过的。
2、宾语从句中的虚拟语气。
(1) wish后接宾语从句中的虚拟语气：根据从句的意义来判断。
A: 表示与现在和将来事实相反的愿望，从句谓语动词用过去时态。例如：
I wish they were not so late. 要是他们来得不是这么晚就好了。
B: 表示与过去事实相反的愿望，从句谓语动词用过去完成时态。例如：
I wished he hadn't done that. 我真希望那件事不是他做的。
(2) 表示“要求、建议、命令”等动词后面的宾语从句中的虚拟语气。用于此结构的动词有：advise, direct, agree, ask, demand, decide, desire, insist, order, prefer, propose, request, suggest等。从句的谓语动词用“should + 动词原形”，其中should 可以省去。例如：
I insisted that he (should) go with us. 我坚持让他和我们一起去。
注意：当insist 表示“坚持认为”、suggest表示“表明，显示”时，不用虚拟语气。例如：
He insisted that she was honest. 他坚持认为她是诚实的。
3、主语从句中的虚拟语气。
(1) It be + 形容词 + that... (should)...。用于该句型的形容词有：necessary, good, important, right, wrong, better, natural, proper, funny, strange, surprising等。例如：
It's natural that he should feel hurt. 他感到疼是很正常的。
(2) It be + 过去分词 + that... (should)...。用于该结构中的过去分词是表示“建议、请求、命令”等词的过去分词。如： desired, suggested, requested, ordered, proposed等。例如：
It is desired that the building of the house be completed next month. 真希望这所房子在下个月前就能竣工。
(3) It is time (about time / high time) that... + (过去时或should + 动词原形)...。例如：
It is high time I went home now. = It is high time I should go home. 我该回家了。
(4) 表语从句、同位语从句中的虚拟语气。在suggestion, proposal, order, plan, idea, advice, decision等需要具体内容解释的名词后要使用虚拟语气，其谓语动词为：should + 动词原形，连接从句的that不能省略。例如：
My suggestion is that we should go there at once. 我的建议是我们应该马上去那儿。
4、省略形式。
有时可以把含有助动词、情态动词、be或have的虚拟条件句中的连词if 省去，而将had, should, were 等词提到主语之前，即用倒装结构。这时，如果出现not等否定词时需放在主语后面。例如：
If she had been here five minutes earlier she would have seen her old friend. → Had she been here five minutes earlier she would have seen her old friend. 如果她早到五分钟，她就会看见她的老朋友了。
条件句中的虚拟语气
英语中条件从句有两类，一类是真实条件句，另一类是非真实条件句。如果假设的情况可能发生，是真实条件句；如果假设的情况是不存在的或不大可能发生的，则是虚拟条件句。
（一）真实条件句
真实条件句表示的假设是可能发生或实现的，主句和从句的谓语动词都要用陈述语气。
If he doesn't come at 8, we won't wait for him.
如果他八点不来，我们就不等他了。
If a flood happened in the past, there was usually a great loss of life and property.
过去发生洪水的话，常有很大的生命和财产损失。
We shall go there unless it rains tomorrow.
如果明天不下雨，我们将去那里。
I'll let you use my bike on condition that you keep it clean.
如果你能保持车子干净，我就让你用我的自行车。
（二）非真实条件句
在含有非真实条件句的复合句中，主句和从句的谓语动词都要用虚拟语气，其构成有三种形式：
1、表示与现在事实相反的条件
条件从句用动词的过去式（be动词用were），主句用should（第一人称）或would（全部人称）+动词原形。可用情态动词could, might代替should, would表示情态。
If it were Sunday tomorrow, I would go and see my friends.
明天要是星期天的话，我就去看望我的朋友。
If I were you, I should go and try.
我要是你，我就去试试。
If wishes were horses, beggars might ride.
如果幻想能成为马匹，叫花子都有了坐骑。
2、表示与过去事实相反的条件
条件从句用动词的过去完成时，主句用should（第一人称）或would（全部人称）+have done，也可用could, might代替should, would。
If I had known your telephone number yesterday, I would have telephoned you.
如果昨天我知道你的电话号码，我就给你打电话了。
If it had not rained this morning, I should have gone shopping.
今天早上要是没下雨，我就去买东西了。
The flood might have caused great damages to the people if we had not built so many reservoirs.
倘若我们没有修建这么多的水库，洪水就会使人民遭受巨大的损失。
3、表示在将来不太可能实现的条件
表示在将来不太可能实现的条件从句有三种形式：
（1）were/did
条件从句用动词的过去式（be动词用were），主句用should（第一人称）或would（全部人称）+动词原形。也可用could, might代替should, would。
If he were here tomorrow, I would speak to him.
明天如果他在这里的话，我就和他谈谈。
If you dropped the glass, it would break.
你要是让杯子掉下来，会打碎的`。
If she had time, she could help me.
她要是有时间，就会帮我了。
（2）should do
条件从句中不管什么人称都用should do，可表示有偶然实现的可能性。
If it should rain, the crops could be saved.
假如下雨，庄稼可能就有救了。
We would trust him if he should be honest.
如果他真是诚实的，那我们就相信他。
（3）were to do
条件从句用were + to do。这种形式比较正式，常出现在书面语中，其假设成份很大，实现的可能性很小。
If I were to do the work, I should do it in a different way.
要是我做这项工作，我就会以不同的方式去做。
If the headmaster were to come, what would we say to him.
假如校长来了，我们对他说什么呢？
【对比】将来不太可能实现的三种非真实条件句中的虚拟语气：
常用形式：
If it snowed tomorrow, I would stay at home.
如果明天下雪的话，我就留在家里。
可能性较小：
If it should snow tomorrow, I would stay at home.
如果明天下雪的话，我就留在家里。
可能性最小：
If it were to snow tomorrow, I would stay at home.
如果明天要下雪的话，我就留在家里。
（三）省略if的条件句
在书面语中，非真实条件句中有were, had, should时，可以省略if，而把were,had, should放在主语前，用倒装结构。
Were it necessary, I might go without delay.
（= If it were necessary......）
如果需要的话，我可以立即去。
Had you taken my advice, you wouldn't have failed in the exam.
（= If you had taken my advice......）
你要是听了我的建议，就不会考试不及格了。
Should I have time, I would call on her.
（= If I should have time......）
要是有时间，我就去看她。
（四）错综条件句
虚拟条件句中的主句和从句涉及的动作发生的时间不一致，这时主句和从句的谓语形式应按照各自动作发生的实际时间来表达。
If you hadn't watched TV yesterday, you wouldn't be so sleepy now.如果你昨天不看电视，你现在也就不会这么困了。（从句yesterday说明过去，主句now说明现在）If they had left home early this morning, they would arrive in half anhour.如果他们今天一早就离开家的话，再过半小时他们就该到了。（从句说明过去，主句说明将来。）If you hesitated this moment, you might suffer in the future.如果你此刻犹豫不决，你将来会吃苦头的。（从句说明现在，主句说明将来）
【注意】在很多情况下，我们也可以用was来代替当主语是第一人称或第三人称单数时的were。
If he were here tomorrow...
也可以说成：If he was here tomorrow...
I wish I were a bird.
也可以说成：I wish I was a bird.
但倒装句型中的were不可被was来替换。
Were I in your position,I would not do it.
如果我处在你的位置，我是不会干这件事的。
（五）含蓄条件句
非真实条件句中的条件从句有时不表达出来，只暗含在上下文中，这种句子叫做含蓄条件句。含蓄条件句大体有三种情况：
1、条件暗含在短语中
He would not get such a result without your help.
没有你的帮助，他就不会有今天的成果。
(条件暗含在介词短语without your help中)
But for you, I could not be recovered so soon.
要不是有你，我就不会恢复得这么快。
(条件暗含在But for you中)
This same thing, happening in the past, would lead to a disaster.
同样的事，如发生在过去，就会酿成大祸。
(条件暗含在分词短语happening in the past中)
He must have been there, or he never could know the place so well.
他一定是去过那儿，否则他绝不会对那个地方如此熟悉。
(暗含条件是连词or)
2、条件可根据上下文推理出
It would do you no good.
这可能会对你没好处。
(条件可能是if you should give up the job如果你放弃这项工作的话)
They could have won.
他们本来是会赢的。
(条件可能是if they had been patient如果他们有耐心的话)
Such mistakes could have been avoided.
这种错误完全能避免。
(条件可能是ifyou had been more careful如果你更加小心一点的话)
Why didn't you tell me about it I should have helped you.
为什么你不告诉我？我会帮助你的。
(条件可能是if you had told me about it如果你当时告诉我的话)
3、条件用其他形式来表示
She was ill, otherwise she would have been present at the meeting.
她病了，否则的话就会出席会议了。
(条件通过连词otherwiseor表示出来If shehad not been ill...)
I told him to go there himself, but perhaps I should have gone together with him.
我让他自己去那里，但也许我应该和他一道去。
(连词but暗示条件)
Suppose you were in my shoes, what would you do?
假若你站在我的立场上，你会怎么办？
(用suppose/supposing/providing等词表示if)
To talk with her, you would know she could not hear well.
如果你同她交谈，你就会知道她的听力不好。
(动词不定式带有假设的意思，相当于If you should talk with her...)
Left to himself, he could not have finished the work.
要是放任他的话，他是不可能完成工作的。
(动词的-ed形式表示条件If hehad been left to himself...)
【提示】在很多情况下，虚拟式已变成习惯说法，很难找出其暗含的条件。
You wouldn't know.
你不会知道。
I would like to go with you.
我愿意和你一起去。
虚拟语气在各种从句中的用法
虚拟语气除主要用于非真实条件句外，还可用在部分主语从句、宾语从句、表语从句、同位语从句、定语从句和状语从句之中。
（一）名词性从句中的虚拟语气
主句中的动词、名词、形容词如表示要求、建议、命令或愿望等含义，与其相关的名词性从句（主语从句、宾语从句、表语从句和同位语从句）中的谓语动词要用虚拟语气。
1、主语从句中的虚拟语气
主语从句通常用于“It is +形容词/名词/动词的-ed形式+ that ...”结构。主语从句中是否用虚拟语气取决于所用的形容词或动词的-ed形式，其谓语动词常用“should +动词原形”（美国英语常省略should，只用动词原形）。
（1）表示建议或命令
It is important that we (should) work out a study plan.
重要的是我们要制订出一个学习计划。
It will be better that we (should) meet some other time.
最好我们在另一个时间见面。
It is suggested that each student (should) sing a song in English.
有人建议每个学生都要唱一首英文歌曲。
It is demanded that he should leave at once.
要求他立刻离开。
（2）表示惊讶
It is strange that he should have failed to see his own shortcomings.
真奇怪他竟看不到自己的缺点。
It is a pity shame that I should be at school instead of lying here inhospital.
真可惜，我应当在学校而不是躺在医院里。
It is natural that you should forget it first.
你起先记不住是很自然的。
【必背】常见的要接含有虚拟语气主语从句的词：
形容词：important,necessary, urgent, essential, vital, natural, strange, proper等
动词的-ed形式：arranged, suggested, ordered, required, desired,demanded,proposed等
It is necessary that the program (should) beloaded into the computer.
有必要把程序输入电脑。
It is strange that he should have learned somuch in such a short time.
很奇怪他竟然在如此短的时间内学了那么多的东西。
It is desired that we (should) get everything ready by tonight.
希望一切在今晚前准备就绪。
2、宾语从句
虚拟语气常用在表示要求、建议、命令或愿望的动词后的宾语从句中。
常见的宾语从句中需用“should+动词原形”的动词有：
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
（1）在suggest（建议）, order(命令), propose(建议),insist（坚持要做）, command (命令)，request（要求），advise（建议）等动词后的宾语从句中，谓语动词用should +动词原形（美国英语常省略should）。
The examination instructor asked that the students (should) not use a calculator.
考官要求学生不要使用计算器。
The workers demanded that their wages (should)be raised by 10 percent.
工人们要求增加百分之十的工资。
They requested that he (should) sing a song.
他们要求他唱一首歌。
【比较】动词suggest和insist后面的宾语从句，应根据不同情况选用陈述语气或虚拟语气：
A. suggest作“建议”解时，用虚拟语气，作“使想起、暗示”解时，用陈述语气。
His silence suggested that he agreed with mydecision.
他的沉默暗示他赞同我的决定。（暗示）
He suggested that I (should) stick to mydecision.
他建议我坚持自己的决定。（建议）
B. insist作“坚决要求”解时，用虚拟语气，作“坚持认为”解时，用陈述语气。
He insists that doing morning exercises does good to people's health.
他坚持认为做早操对健康有益。（强调）
He insists that he (should) do morning exercises every day.
他坚持每天都要做早操。（要求）
（2）在动词wish后的宾语从句中用虚拟语气，表示不可能实现的愿望。
①一般过去时were/did，表示目前不可能实现的愿望
I wish I were a bird.
但愿我是一只小鸟。
I wish I knew the answer.
我要是知道答案就好了。
②过去完成时had done，表示过去不可能实现的愿望
I wish she had taken my advice.
那时她要是接受我的建议就好了。
I wish that I had seen her yesterday.
真希望我昨天见过她。
③过去将来时would/could do，表示将来没有把握或不可能实现的愿望
I wish you would stay an hour longer.
我希望你再呆一个小时。
I wish it could stop raining.
但愿雨能停。
【提示】由于wish和hope的汉语意思差不多，在使用上往往容易出错。wish一般表示“希望”、“但愿”，表示不可能实现的愿望，后接从句时要用虚拟语气；hope表示“希望”，指可以实现的希望，后接从句时用陈述语气。
The students hope that their football team will win the game.
学生们希望他们的足球队获胜。（可能实现）
I wish I could see him now.
我希望现在就能看到他。（不可能实现）
3、表语从句和同位语从句中的虚拟语气
在表示建议、劝告、命令等含义的名词后的表语从句和同位语从句中，谓语动词要用“should+动词原形”结构。
My advice is that you (should) practise speaking English as often as possible.我的建议是你尽可能经常地练习说英语。
The demand is that the composition (should)be written on one side only.
按照要求作文必须单面誊写。
It is my desire that all the members of the family (should) gather once a year.我的愿望是所有家庭成员一年团圆一次。
The suggestion that education (should) be reformed is reasonable.
教育要改革的建议是合理的。
【必背】表示建议、劝告、命令等含义的名词常见的有：
advice建议
demand要求
desire愿望
decision决定
idea意见
motion提议
order命令
proposal提议
requirement要求
request请求
regulation规章
suggestion建议
（二）状语从句中的虚拟语气
1、方式状语从句
由as if或as though引导的'状语从句可以用陈述语气表示可能符合事实的情况，也可以用虚拟语气表示与事实不符或与事实相反的情况。
①表示与现在事实不相符，用一般过去时
The teacher treats the pupil as if he were her own child.
这位老师对待这位学生就像自己的亲生孩子一样。（这位学生并不是她的亲生孩子）
②表示与过去事实不相符，用过去完成时
I feltas though we had known each other for years.
我感觉我们好像认识多年了。（其实并没有认识多年）
③表示与将来事实不相符，用would/might/could
It looksas if it might rain.
天看上去好像要下雨。（不大可能下雨）
【对比】
He looks as if he is young.
看样子他好像很年轻。（他就是年轻）
He looks as if he were young.
看样子他好像很年轻。（实际上他不年轻）
2、目的状语从句
（1）由incase, lest, for fear that引导的目的状语从句，动词用“should+动词原形”结构，表示忧虑或目的。
Please remind me of it again tomorrow in case I (should) forget.
请你明天再提醒我这件事，以免我忘记。
She emphasized it again and again, lest he (should) forget.
她一再强调这一点免得他忘记。
We had a meeting and talked the matter over face to face for fear that thereshould be any misunderstanding.
我们开了一个会，面对面谈了这件事，以免发生任何误会.
（2）在inorder that和so that引导的目的状语从句中，往往用can(could)或may(might)。
I shall write down your telephone number so that I may not forget.
我要把你的电话号码记下来，以免忘记。
They worked harder than usual in order that they could finish the work ahead of time.
为了能提前完成工作，他们比往常更加努力。
We will tell you the truth so that you can judge for yourself.
我把真实情况告诉你，使你能自己作出判断。
3、让步状语从句
让步状语从句指事实时，从句谓语动词用陈述语气。若从句内容表示现在和将来的假设情况，从句谓语动词用虚拟语气。
Though he (should) fail, there would still be hope.
即使他失败了，仍有一线希望。
I should say the same thing even if he were here.
即使他在这里，我还是要这么说。
Whether he (should) succeed or fail, we shall have to do our part.
不管他成功还是失败，我们还是要做好自己的事。
However hard it might rain rains, we shall go there together.
不管雨下得多么大，今晚我们还是要去那里。
No matter what his social position (might) be, a man is equal in the eye of the law.
一个人不论其社会地位如何，在法律面前都是平等的。
（三）定语从句中的虚拟语气
在It is (high) time (that) ...结构中，定语从句的谓语动词用过去式，表示“到某人该做某事的时间了”。
It is time that the children went to bed.
到孩子们睡觉的时间了。
It is high time that we began the meeting.
正是我们开会的时间了。
其他句型中的虚拟语气
（一）If only......
If only位于句首引起的感叹句用虚拟语气，动词用一般过去时表示目前的愿望，用过去完成时表示过去的愿望，用would或could表示将来。
If onlyhe knew the answer.
他要是知道答案就好了。（用过去时表示现在）
If onlyI could speak several foreign languages！
我要是能讲几种外语就好了！（用would/could表示将来）
If only you had told me the truth before.
要是你以前告诉我真相就好了。（用过去完成时表示过去）
【注意】if only和wish的用法相同，表示的意愿也基本相同。
If only it would rain.
但愿天能下点儿雨！
（=How I wish it would rain.）
If onlyI had known her earlier!
要是我早点儿认识她就好了！
（= Iwish I had known her earlier.）
（二）would rather
would rather, would prefer, would sooner等后接从句，表示“宁愿”，动词用过去时表示当时和将来的情况，用过去完成时表示过去的情况。
I wouldrather you left today.
我宁可你今天走。
I would prefer he didn't stay here too long.
我倒希望他不要在这儿呆得太久。
I would rather I hadn't seen that film yesterday.
我宁愿昨天没有看那场电影。
【提示】would rather主要有两种用法：
A. 后接不带to的不定式
I'd rather play tennis than swim.
我宁愿打网球，也不愿游泳。
I'd rather not go to the movies.
我宁愿不去看电影。
Which would you rather have, tea or coffee?
你喜欢喝茶，还是咖啡?
B. 后接不用连词的that从句
I'd rather you went home now.
我希望你现在就回家。
I would rather my daughter attended a public school.
我希望我的女儿能上公立学校。
（三）表示愿望的感叹句
在表示祝愿的感叹句中，用动词原形，表示愿望。
Long live the People's Republic of China!
中华人民共和国万岁！
May you be happy!
祝您快乐！
God bless you!
上帝保佑你！
Success attend you!
祝你成功！
The Lord save us!
愿主救我们！
（四）情态动词用于虚拟语气
部分情态动词的过去形式（could,might, should, would），可以用于非真实条件句以及其他结构中表示虚拟语气。
1、表示想像或猜测
If Icould speak French, I would teach you.
如果我会说法语，我就能教你。（我不会，所以不能教你）
If you phoned him right now, you might get the matter settled.
如果你现在给他打电话，你就可以把问题解决了。
There could be something wrong with the tape recorder.
这台录音机可能出毛病了。
He mighthave said so.
他可能这样说过。
Could he have done such a foolish thing？
他会做这样的傻事吗？
2、表示委婉或客气
虚拟语气（could,would, might +动词原形）可使说话者的口气变得委婉客气。
You could answer this email for me.
你可以替我回这个电子邮件。
Could you leave me your telephone number and address？
你能将电话号码和地址留给我吗？
Would you mind opening the window？劳驾把窗子打开，好吗？
You might as well put off the discussion till next week.
你们不妨把讨论推迟到下个星期。
【比较】
would like to do愿意，想要
would like to have done本来想
I would like (to have) a word with you.
我想和你谈一谈。(现在想)
I would like to have talked with you.
我原本想和你谈一谈的。（没有谈成）
3、表示惋惜或责备
Given more time, we could have done better.
如果给我们更多时间，我们能够干得更好些。（我们并没有得到更多的时间）
You could have got up a little earlier！
你完全可以早点儿起来！（实际上没有早起）
It was cold yesterday. I should have worn a heavy coat.
昨天很冷，我该穿件厚外套的.。（但我没穿）
This wall shouldn't have been pained blue.
这墙不应该漆成蓝色。（但已漆了）
【提示】
当代英语一个显著的变化就是虚拟语气的使用越来越少，许多该用虚拟语气的地方都用陈述语气代替。
He suggested that I went to the hospital at once.
他建议我们立刻去医院。（原应用shouldgo）
We shall write down the address lest we forget.
我们要把地址记下来，以免忘记。（原应用shouldforget）
Imagine you are an astronaut.
设想你是个宇航员。（原应用were）
虚拟语气的十一条规律
一.虚拟语气用于假设
二.虚拟语气用于以as if和as though(好像)引导的方式状语从句中，表示不太符合实际的比喻
This microcomputer operates as though it had been repaired.这台微型计算机操作起来好像修理过似的。(事实上这台微型计算机操作前没有进行过修理。)
【注】在look和其他个别动词后引起的as if或as though的从句内，可以用
虚拟语气，目前有趋势，也可以用陈述语气，因为as if和as though(好像)已
衬托出虚拟语气的含义。
1.It seems as if we shall have to walk home.看来我们似乎得步行回家了。
2.It sounds as though someone is knocking at the door.听起来似乎有人在敲门。
三.虚拟语气用于以lest，for fear that和in case引导的目的状语从句中
1.He is working hard for fear that should fall behind.他工作努力，怕落在别人后面。
2.I wrote everything down lest I should it.为了怕忘记，我把毎件事都记下来了。
必须注意，上述目的状语从句内的should还可以省略，于是就以动词原形出现。
四，虚拟语气用于though(或although)，evenif和eventhough引出的让
步状语从句中，表示已不把让步作为事实，却把它当作假设来用
1.Even if he were here, he could not solve the problem at once, either. 即使他在这里，他也不能立即解决这个问题。(事实上他没有在这里。)
2.Though(或Although)he blame me，yet will I trust in him.即使他责备
我，我还是依然信任他。
上句是用动词原形表示虚拟语气，借以体现不把让步当作事实。
与此同理，如果在条件从句内也采用动词原形表示虚拟语气，当然也可把条件转为假设。
例如：
If the news be true,his life is in the greatest danger.如果这消息确实，那么他的生命处于极其危险之中。(注意主词并没用虚拟语气。)
五.虚拟语气用于表示愿望的固定句型结构中
1.You had better clear up this problem.你最好将这间题解样清楚。
2.We would like to see her.我们愿意见她。
3.He would rather you didn't do that for the time being. 他宁可让你暂时不要做那件事。
六.虚拟语气用于主句中含有建议、劝告、要求，请求、需要、愿望、命令
等词语的有关从句中，体现一种“让某人做某事”的主观意向
1.I recommended that he (should) study more English before going abroad.我建议(让)他出国前多学点英语。(宾语从句用虚拟语气。)
2.She thinks it necessary that we should obtain experience through practice.她认为有必要让我们通过实践取得经验。(it为形式宾语，后面从句为真正宾语，并用了虚拟语气。)
3.I agree to the proposal that we (should) put this question to the vote. 我同意这个提议——让这问题付诸表决。(同位语从句用虚拟语气。)
4.It is desired that you (should) put yourself in his position. 希望（让）你
设身处地为他想一想。(主语从句用虚拟语气。)
【注】属干本类用法的词语还有：demand,propose,command,request,insist,
suggestion,idea,order,recommendation,motion(动议)，plan等。见到这些词，
后面从句用should或用动词原形，便是虚拟语气的用法了。
七.虚拟语气用于表不祝愿的祈使句中，一般用动词原形，或者may加动
词原形
May your life be long.祝(愿)君长寿!
八.虚拟语气用于表示主观揣测和婉转的语气
1.Would you write a letter to him? 你要不要给他写一封信了(婉转语气。用will就不如would显得客气。)
2.May I come in?我可以进来吗？（用might比may语气委婉。）
九.虚拟语气用于it is time后的定语从句中
1.It is (high) time (that) we (should) set off.我们该动身了!
2.It is time(that )we got up.我们该起床了!(本句用一般过去时表示虚拟语气。关系副词that常省略。)
在本句型中，第2句的虚拟语气表示法比第1句用得更广泛。
十，虚拟语气用于表示惊奇、疑惑、没料到的'事
1.I never thought that the problem should be so easy.我从来没想到这问题居然会如此容易。
2.We just couldn't believe that the new building should be so beautiful. 我们简直不相信新楼会这样漂亮。
【注】对过去事实表示惊奇，should后用完成式动词；对今后的事表示惊奇，则should后用一般式动词。
十一.虚拟语气用于it is important(或natural)，it has been decided， I am sorry，they were disappointed等句子后面的从句中
1.It is natural that I should drop in on my teacher.自然我要顺便走访我的老师
2.I am sorry that he should be so weak.很遗憾，他身体(竟然)这样弱。
虚拟语气的语法作业
1. He acted ____ he had never lived in China before.
2.____ to the doctor right away, he mighthave been alive.
3. If you were older, I ____ you to gothere yesterday.
4. The secretary suggested that they ____the men in at once.
5. I wish I ____ able to tell him all aboutit last night.
6. If we ____ here ten minutes earlier, we___ the bus.
7. If I ____ more time, I would have gonewith him.
8. He was very busy yesterday, otherwise he____ to the meeting.
9. The Jade Emperor ordered that the MonkeyKing _____ right away.
10.Jane's uncle insisted ____ in this hotelany longer.
11.Don't touch the sleeping tiger. If hewoke up, he _____ you.
12.Without electricity human life _____quite different today.
13.How I wish I ____ to reapair the watch!I only made it worse.
14.He demanded that the laboratory report___ immediately after the experiment was done.
15.The man insisted that he _____ there.
16.If he had not gone out in the storm_____.
17.If it ___ tomorrow, what would we do?
18.It is required that you ____ at six.
19.If only I _____ how to operate anelectronic computer as you do.
20.He spoke in a quiet, distinct voice, asthough his thought _____.
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