高中英语虚拟语气详解精讲
高中英语虚拟语气的用法归纳
高中英语虚拟语气的用法归纳以下是高中英语虚拟语气的用法归纳：虚拟语气是一种特殊的动词形式，表示假设、愿望、建议、命令、猜测等非真实的情况。
一、基本用法1. 与现在事实相反条件从句：If + 主语 + 动词过去式（be 动词用 were）主句：主语 + would/should/could/might + 动词原形例句：If I were you, I would study harder. （如果我是你，我会更努力学习。
）Wouldn't life be boring if we had everything we wanted? （如果我们想要什么就有什么，生活岂不是很无聊？）2. 与过去事实相反条件从句：If + 主语 + had + 过去分词主句：主语 + would/should/could/might + have + 过去分词例句：If I had known your phone number, I would have called you. （如果我知道你的电话号码，我就给你打电话了。
）Couldn't you have done better if you had tried harder? （如果你再努力些，难道不能做得更好吗？）3. 与将来事实相反条件从句：① If + 主语 + 动词过去式② If + 主语 + were to + 动词原形③ If + 主语 + should + 动词原形主句：主语 + would/should/could/might + 动词原形例句：If it rained tomorrow, we would stay at home. （如果明天下雨，我们就待在家里。
）If she were to come here tomorrow, I would be very happy. （如果她明天来这儿，我会非常高兴。
）If he should fail in the exam, how disappointed his parents would be!（要是他考试不及格，他父母该多失望啊！）二、固定搭配1. wish 后的宾语从句与现在事实相反：从句用一般过去时与过去事实相反：从句用过去完成时与将来事实相反：从句用 would/could + 动词原形例句：I wish I were as tall as you. （我希望我和你一样高。
高中英语之虚拟语气详细讲解
虚拟语气（1）——倒推时态类定义：虚拟语气是一种动词形式，有两种意思 1.表示说话人所说的不是事实，而是一种假设、猜测、怀疑等（非真实条件状从和让步状从）2.表示说话人的愿望、要求、命令、建议（名词性从句：主宾表同）使用情景 1.用来表达一个假设或纯粹的意愿（与事实相反或不太可能实现）（如果我是宇航员，我要在月球上跳舞）2.用来缓和语气，使句子更委婉、礼貌、得体（如果你能接受我的邀请，我将不胜感激）3.表示烦恼、不耐烦等情绪（你要是能考上大学，全家都烧高香了）4.表示适度的责备或批评（如果你那时更耐心点，现在我们都成功了）5.表示美好的祝愿或祝福（祝你成功）1.虚拟条件句一般虚拟条件句混合虚拟语气（错综时间条件句）定义：条件状语从句表示的行为和主句表示的行为发生的时间不一致例子：If you had followed my advice, you would be better now.如果那时你听了我的建议，现在已经好了If it hadn’t been for you, I would have to make another trip there tomorrow.如果不是你的话，我明天还要再走一趟。
If you had studied hard before,you would be a college student now.如果你以前努力学习的话，你现在就是大学生了。
省略+倒装当虚拟条件句的谓语动词中含有were，should，had时，if可以省略，并将were,should,had提前于句首，变为倒装句。
如果虚拟条件句是否定句，not 保留在原处If he should agree to go there, we should send him there.= Should he agree to go there,we should send him there.If she were there,she would agree with us.= Were she were, she would agree with us.If he had learnt about computers,we would have hired him.= Had he learnt about computers,we would have hired him.含蓄虚拟条件句定义：有时为了表达的需要，在虚拟语气中并不总是出现if引导的条件状语从句，而是通过其他手段来代替条件从句分类：1) but for....=(If it+be not for) ；without；Without your help ,we couldn’t have finished the work ahead of time.= But for your help,we couldn’t have finished the work ahead of time.= If it hadn’t been for your help,we couldn’t have finished the work ahead of time.没有你的帮助，我们不可能完成任务。
高二英语虚拟语气知识精讲
高二英语虚拟语气知识精讲一语气的定义和种类（一）语气(mood)语气是动词的一种形式，表示说话人对某一行为或事情的看法和态度。
（二）语气的种类1、陈述语气：表示动作或状态是现实的、确定的或符合事实的，用于陈述句、疑问句和某些感叹句。
如：①There are two sides to every question.每个问题都有两个方面。
②Were you busy all day yesterday?昨天一整天你都很忙吗？③How good a teacher she is!她是多好的一位老师啊！2、祈使语气：表示说话人对对方的请求或命令。
如：①Never be late again!再也不要迟到了。
②Don’t forget to turn off the light.别忘了关灯。
3、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。
如：①If I were a bird, I could fly in the air.如果我是一只小鸟，我就能在空中飞行。
②I wish I could pass the examination.我希望我能通过考试。
③May you succeed!祝您成功！。
二虚拟语气的主要内容（一）、非真实条件句中的虚拟语气虚拟语气用于if引导的非真实条件状语从句中，谓语动词有三种形式：（1）表示与过去的事实相反，条件状语从句中的谓语动词用过去完成时，主句中的谓语动词则用“would / should / might / could + have +过去分词”。
如：①If he had taken my advice, he would have succeeded in the competition.②If we had started earlier, we should not have missed the train.③If she hadn’t been ill, she might have come.（2）表示与现在事实相反的假设，条件状语从句中的谓语动词用“过去式（be动词的过去式用were）”，而主句中的谓语动词用“would / should/ could / might + 动词原形”。
高中虚拟语气用法解析
高中虚拟语气用法解析（完整版）一．虚拟语气在非真实条件句中的应用非真实条件句：if引导的条件状语从句，但是实现该条件的可能性极小或不可能实现1.表示与过去事实相反Eg.If my car had been more reliable,I would have driven to my office.2.表示与现在事实相反Eg.In fact,it is certain that we would not be able to understand it if we heard it today.3.表示与将来事实相反Eg.If you succeed,everything would be all right.Grace doesn't want to move to New York because she thinks if she were to live there,she wouldn't be able to see her parents.4.注意事项(1)W as不可以替代were，虚拟语气中，从句中be动词只有were(2)错综时间条件句：条件句的行为和主句行为发生的时间不一致，动词的形式按照主句和从句各自的时间调整。
Eg.If he had listened to me, he would not be in such trouble now. If it had not been raining too much, the crops would be growing much better.(3)虚拟条件句中的谓语动词含有were/ should /had 时，if可省略，而将were/ should /had 置于主语前面Eg.What would have happened had Bob walked farther as far as the river bank?Should he agree to go there, we should send him there. Were it Sunday tomorrow, we should go to the great wall.两个固定搭配：①Were it not for 要不是...就②Had it not been for 要不是...就If it were not for （Were it not for）the bad weather now, we would go to the park to fly kites.If it had not been for（Had it not been for） the bad weather yesterday, we would have gone to the park to fly kites. （4）含蓄虚拟条件句：有时假设的情况不是以if条件句来表示。
高中英语语法讲解——虚拟语气PPT教学课件
1.2.虚拟语气用于宾语从句 1.2.1.句型“…wish that…” 在wish后的that宾语从句中：1.如果表示对现在的愿望，从句谓语要使用过去时: （1）从句谓语动词如果是be，则用were形式。 （2）从句谓语动词如果是行为动词，则用过去时形式。--I wish I were a bird. 但愿我是只鸟儿。--I wish you didn’t talk like that. 但愿你没有那样说。
1.1.6.含蓄条件句
英语中有些句子从形式上看不包含条件从句，但在意义上却是非真实条件句，这类句子称为含蓄条件句，这样的句子可分为三类
1.省略整个条件句 --Such mistakes could have been avoided. (省略了if we had been more careful). 这样的错误本来是能够避免的。 --I should have caught the train. (省略了if I had left a little earlier) 我本应该赶上火车的。
2.如果表示对将来的愿望，从句谓语动词用 “would (could, might )+动词原形” 的形式。 --I wish you would do the favor for me. 但愿你会帮我这个忙。 --I wish I could speak several languages. 但愿我会说好几种语言。
1.1.2.和过去事实相反的非真实条件句
这类非真实条件句表示过去未发生的事情，和过去事实相反。比如：
--If I had left a little earlier ,I would have caught the train. 如果我早一点离开的话，我就会赶上火车了。--The man’s life might have been saved if he had been sent to a better hospital.如果把那个人送到一家更好的医院的话，他也许回被救活的
高中英语虚拟语气讲解(很完整的总结)
Subjunctive Mood虚拟语气(1)If I had got there earlier, I would have met Mr. Li.If he hadn’t been warned，he would have taken that food.(2)If he were free, he would help us. If I had money, I would buy the car.If it were not for the expense, I would go abroad now.(3) If he should come/were to come/came here, we would hold the party.If it were to rain tomorrow, the meeting would be put off.1.倒装/省略当虚拟条件句中的谓语动词含有were, should, had时，if可省略，而将were, should, had 等词置于句首。
请改写以上六个例句中符合倒装/省略条件的句子！2.错综时间虚拟条件句。
主从句的动作若不是同时发生时，须区别对待。
①从句的动作与过去事实相反，而主句的动作与现在/将来的事实不符。
If they had informed us, we would not come here now.If you had listened to me, you wouldn’t be in such trouble now.If you hadn’t watched television so late, you wouldn’t be so sleepy now.If I had studied hard at school, I would be a student in the key university now and find a good job after four years.②从句的动作与过去发生的情况相反，而主句的动作与现在正在发生的情况相反。
虚拟语气精讲精练总结
What would you do if you won the lottery? If I won the lottery, I would…
If I won the lottery, I would buy an expensive car.
If I had a lot of money,
1. if only 意为：若是...那该多好啊; 真希望...; 只要, 只要...就好 表示现在的情况,应用过去式; 如果是过去的情况,应用过去完成时态
If only I had arrived in time !
If only she didn’t drive so fast.
I wish I ________ you yesterday.
His silence at the meeting suggested that he ________ to your plan.
A.didn’t agree B.hadn’t agreed
C.wouldn’t agree D.not agree
NOTES:
与现在相反
例： If I were a teacher, I would be strict with my students.
If I had HIV, I would know because I would feel sick.
had HIV
would feel
were
would be
had driven
If he more carefully, he the car accident yesterday.
would not have had
If I how to swim, I trapped in this island. had learnt would not have been
2025届高考英语虚拟语气知识点总结+课件
Homework
1. 完成高考汇编关于虚拟语气的练习题； 2. 用虚拟语气完成小诗。小诗的首句已给出。
If I were a bird, I would fly into the sky. ......
Thanks
为什么不用If I am a boy? 为什么不用If I was a boy?
虚拟语气是由句中的谓语动词的特殊形式表示出来的。
动词语气
1、虚拟语气：虚拟语气表示说话人的主观愿望、猜疑、建议或与事实不符 的假设等，而不表示客观存在的事实。 2、虚拟语气是由句中的谓语动词的特殊形式表示出来的。
你会辨认虚拟语气了吗？
对现在的虚拟条件从句
If there were no subjunctive(虚拟语气), English would be much easier.
从句
主句
If + 主语 + 过去式（were），主语 + should/would/could/might + 动词原形
来练一练
1. If there ____w__e_r_e____ (be) no air or water，there ____w_o_u__ld__b_e_____no living things on the earth.
如果我是个男孩 我想我能够明白 爱一个女孩是什么样的滋味 我发誓我会是一个好男人 我会倾听她， 因为我了解
When you loose the one you wanted 失去了你爱的人那有多痛苦
Cause he’s taken you for granted
因为他把你视作理所当然
And everything you had got destroyed! 你的一切都被毁
高中英语语法课件-虚拟语气(全)(共55张PPT)详解
实战练习 5
2001年1月大学英语四级题目： Some women a good salary in a job instead of staying home, but they decided not to work for the sake of the family. A. must make B. should have made C. would make D. could have made
解题思路
这是一道错综时间虚拟条件句。 在本句中，从句是对过去发生的事情进 行假设，主句是对现在情况的假设。 译文：当你掉下来时，如果不是我在梯 子下面把你接住，恐怕你现在就不会笑 了。选A
实战练习 2
If you had taken your medicine yesterday, you ___ well now. A. are B. had been C. would be D. were 正确答案: C
祈使语气主要用于祈使句。 e.g. Get out of here! 虚拟语气
II. 什么是虚拟语气？
虚拟语气是一种特殊的动词形式，表示说话人 所说的话不是事实，而是想象、假设、建议、 打算、意见、愿望、怀疑、推测、喜悦等等。 e.g. If we had met her last night, we would have told her what had happened. 如果我们昨晚见到她，我们就会告诉她发生了 什么事。 （实际上，我们并没有见到她，也没有告诉她 所发生的事。）
注意！！！
如果条件从句是否定式，倒装时只能把 not 放在主语之后，不能用缩写式把not 放在主语之前。 e.g. Had you not told me about the matter, I should never have known the whole thing. (不能说：Hadn’t you told me…)
(完整版)高中虚拟语气用法详解
一、什么是虚拟语气虚拟语气是一种动词形式，表示说话人的一种愿望，假设，怀疑，猜测，建议等含义，虚拟语气所表示的含义不是客观存在的事实。
If I were you, I'd take them away. 如果我是你的话，我就会带走他们。
（不可能是你，所以这是不存在的事实，所以用虚拟语气）If I had met Tom, I could have told him. 如果我碰见了Tom，我就告诉他了。
If I had time, I could come to help you. 如果我有时间，我会来帮助你的。
He suggested that our class should be divided into five groups. 他建议说我们的班应该分成五个小组。
He speaks to us as if he had been there. 他给我们讲的好像他去过那儿。
二、虚拟语气的用法虚拟语气在一般用于简单句，宾语从句，主语从句，表语从句，壮语从句以及同位于从句。
（下面我们分别看一下）1) 虚拟语气用在简单句中，表示祝愿，命令，它的谓语动词就是原形。
May you be happy. 祝你幸福。
May you have a good time. 祝愿你玩的痛快。
May the friendship between us last long. 祝愿我们的友情天长地久。
Have a good journey! 祝愿你旅途愉快！You go out！你出去！2) 虚拟语气用在宾语从句中。
在suggest, advise, propose, insist, demand, desire, request, require, decide, order, command等动词后的宾语从句中，要用虚拟语气，表示建议、要求、决定或命令等，其谓语动词形式为should+动词原形，其中should可以省略，主句中的时态不限。
2025届高考英语语法复习虚拟语气知识讲解讲义
高考英语语法复习虚拟语气知识讲解一、基础知识（一）什么是虚拟语气谓语动词的作用不仅可以表示动作的时间、状态、假设（情感），也是一种语气（mood)的表现形式，表明说话的目的和意图。
（语气包含陈述语气、祈使语气、虚拟语气、疑问语气）虚拟语气用于表示假设、愿望、建议、命令等非真实或虚拟的情况，即与真实相反。
上学的时候老师经常举的一个例子，"If I were you"因为我不可能是你，这是一种不可能存在的事实，所以这是个虚拟语句。
总而言之英语中的虚拟语气可以分为两大体系：一是表示与事实相反的，或者是假象的情形，通常由if引导，叫做虚拟条件句；另一个体系是在名词从句中使用虚拟语气，表示建议，命令或者要求等语气，类似于上述美剧常用的台词。
（二）虚拟语气的用法这一部分我们主要用虚拟语气在条件句中的用法作为讲解不同情况条件从句谓语主句谓语使用场景与过去事实相反If+主语+haddone主语+should/would/could/might+have done既然是过去了，那么谈到的一切情况都已既成事实，所以过去虚拟表达的是一个与过去事实相反的情形与现在事实相反If+主语+did(be动词用were)主语+should/would/could/might+do既可能是事实，也可能是假设条件。
因此，假设条件句和事实相反句适用于谈现在的情况与将来事实相反If+主语+ did(be动词用were)If+主语+ wereto + doIf+主语+should+ do主语+should/would/could/might+do对于将来时间的虚拟不可能以事实为基础，而只能是表达说话人的一个设想或愿望。
所以，对于将来的虚拟只适用于假设条件句，而不可能表达一个与事实相反的虚拟与现在事实相反：If I had a map, I would lend it to you.如果我有地图我就借给你。
（但我没有）与将来事实相反：If I were to do the job, I would do it in a different way. 要是我来做这工作，我会是另一种做法。
高中语法精讲虚拟语气
高中语法精讲虚拟语气(1)对现在的虚拟If从句主句did/were would/should/could/might doIf I were you, I would tell her the truth.=Were I you, I would tell her the truth.If条件句的倒装:去掉if, 句子部分倒装(半倒装，即以前学过的一般疑问句的语序)备注虚拟语气中，不管主语是不是单数都用were(2)对过去的虚拟If从句主句had done would/should/could/might have doneIf you had taken my advice, you would have passed the exam.=Had you taken my advice, you would have passed the exam.省略if(3)对将来的虚拟If从句主句did/should do/were to do would/should /could/might doIf he didn't come tomorrow, we would put off the meeting.=If he should come tomorrw, we would put off the meeting.=If he were to come tomorrw, we would put off the meeting.总结主过将从过主过将完从过完[例1](陕西卷)If we ___the other road, we might have arrived here in time for the meeting.A. takeB. had takenC. tookD. have taken答案B主句是过将完，所以从过完，过去完成时[例2](天津卷)--John went to the hospital alone.--If he___me about it, I would have gone with him.A. should tellB. tellsC. toldD. had told答案D[例3] (2013重庆)- It rained cats and dogs this morning. I'm glad we took an umbrella.- Yeah, we would have got wet all over if we__A. hadn'tB. haven'tC. didn'tD. don't答案A省略特殊情况①错综时间条件句例: If you had followed my advice just now, you would be better now.If you had studied hard before, you would be a college student now.做题时注意:动词的形式根据它所表示的时间作出相应的调整。
高二虚拟语气用法讲解()课件
as if 的用法
含义
表示“好像，似乎，仿佛 ”。
用法
用于描述与实际情况相反 的情况，或者描述某事物 的性质、状态或效果。
例句
He spoke as if he had been there. 他说话的口 气好像他去过那儿。
it is (high) time 的用法
含义
表示“是时候做某事了”。
用法
单项选择题
答案及解析
A。If only引导的感叹句，表示 “要是……就好了”，与过去事 实相反，从句用“had+过去分
词”。
题目2
I _____ my homework last night, but I had to help my mother with the housework.
答案及解析
D。根据句意“我本应该昨晚做 作业的，但我必须帮妈妈做家务 ”，表示对过去情况的虚拟，主 句用“should+have+过去分词
”。
填空题
总结词
考察虚拟语气在填空题中的运用
题目1
It's a pity that he _____ the film last night.
填空题
答案及解析
D。根据句意“很遗憾 他昨晚可能错过了电影 ”，表示对过去的推测 ，用“might+have+ 过去分词”。
特点
虚拟语气通常使用动词的过去时 态或过去完成时态，有时还会使 用助动词“would”、“could” 、“might”等。
虚拟语气的分类
与现在事实相反的虚拟语气
表示与现在实际情况相反的情况。
与过去事实相反的虚拟语气
表示与过去实际情况相反的情况。
高中英语-虚拟语气精讲(超全整理篇)详解
现在 过去
did / were had done 1. did / were 2. should do 3. were to do
将来
would/could/should/ might + V.(原)
与现在事实相反： 虚拟条件句
did be---were
主句
should/would/could/mig ht + do
要是失败了，我会再试一次。
明天要是周日的话，我们就不参加考 试了。
If it were Sunday tomorrow, we wouldn’t have an exam.
主从句的谓语形式
时间
If 从句的谓语形式
主句的谓语形式 would/could/should/ might +V.(原) would/could/should/ might+have+done.
The Subjunctive Mood
虚拟语气
英语动词有 三 种语气 陈述语气 祈使语气 虚拟语气
用来表示说的话不是事实，或者是不太可能发生的情况，而 是一种愿望，建议，假设的语气叫虚拟语气。
虚拟语气的应用
A. 虚拟语气在条件状语从句中的 应用 B. 虚拟语气在某些从句中的应用 C. 虚拟语气在某些句型中的应用
This same thing, happening in wartime, would lead to a disaster. (条件暗含在分词短语happening in wartime 中) He studied hard at high school, or he couldn’t have entered Beijing University. (暗含条件是连词or) Alone, he would have been terrified. (暗含条件是alone)
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高中虚拟语气精讲英语动词有三种语气，陈述语气，祈使语气和虚拟语气。
定义：用来表示说的话不是事实，或者是不可能发生的情况，而是一种愿望，建议，假设的语气叫虚拟语气。
●虚拟语气在条件状语从句中的用法。
假如我有足够的钱, 我就去环游世界.If I had enough money, I would travel around the world.假如我是你, 我就不会说那样的话.If I were you, I would not say that.假如我听了你的建议, 我就不会犯错误了.If I had taken your advice, I wouldn’t have made a mistake.假如明天下雪的话, 我就不去野营了.If it should rain tomorrow, I wouldn’t go camping.●有时表示虚拟语气的条件从句或者主句都可以省略，而只剩下一个主句或者一个条件从句。
●假设条件从句谓语动词发生的时间与主句所假设的谓语动词不一致，叫做错综条件虚拟语气。
主句和从句的谓语动词要依照假设的时间而定。
(“各归各”的原则）If the weather had been finer, the crops would be growing still better.If you had followed the teacher’s advice, you wouldn’t fail the exam now.●假设条件虚拟倒装。
条件从句中有should，were，had三个助动词可以把if省略，并将这三个词提至句首。
If I were you, I would give it up.Were I you, I would give it up.If it were not for your advice, we couldn’t have got over the difficulties.Were it not for your advice, we couldn’t have got over the difficulties.If I had had time, I would have run round that lake again.Had I had time, I would have run round that lake again.If there should be a flood, what should we do?Should there be a flood, what should we do?没有阳光，人们的生活将于今天的截然不同。
Without sunlight, people’s life would be different from today.要是没有你的帮助，我就不能完成那项工作。
But for your help, I wouldn’t have finished the work.With favorable winds, we might have arrived there in two days.●with, or, otherwise, but, however 引导的从句如与事实不符，用虚拟My parents lent me the money. Otherwise, I couldn't have afforded thetrip.我父母借钱给我了。
否则，我可付不起这次旅费。
（虚拟）Shut the window, otherwise it'll get too cold in here. （非虚拟）I'm lucky that I'm interested in school work, otherwise I'd go mad.要是我们的父母能和我们住在一起就好了。
If only our parents could live with us!要是我没错过火车就好了！If only I hadn’t missed the train!●虚拟语气特殊句型：●宾语从句。
常见动词：一个坚持，两个命令，三个建议，四个要求。
insist, order, command, advise, suggest, propose, demand , require, request, desire (注意：当insist表示“坚持认为”、suggest表示“表明，显示”时，不用虚拟语气。
)这些动词后面的宾语从句要使用虚拟语气。
即从句中的动词使用should + 动词原形，或者将should省略。
我们建议他去看一下医生。
We suggested that he (should ) go to see the doctor.他坚决要求我参加他的毕业典礼。
He insisted that I (should ) be present at his graduation ceremony.国王命令囚犯明天要实施死刑。
The king ordered that the prisoners be killed the next day.他要求我们派他去那儿工作。
He requested that we (should) send him to work there.以上动词相应的名词构成的名词性从句包括主语从句，表语从句和同位语从句也要使用虚拟语气。
从句中的动词形式一样。
即：(should)＋V.order, advice, suggestion, proposal, demand, request, desire有人建议计划应该马上执行。
It’s suggested that the plan be carried out at once.我的要求是她每周来看我一次。
My demand is that she should come to see me once a week.我们所有的人都支持化工厂应该关闭的这个建议All of us are for the advice that the chemical factory should be closed down.我宁愿你现在就付钱给我.I would rather you paid me now.我宁愿你也去了.I would rather you had gone, too.别来. 我宁愿你明天来.Don’t come. I would rather you came tomorrow.但愿我是一只小鸟。
I wish I were a bird.但愿我没犯过这样一个错误。
I wish I hadn’t made such a mistake.希望我们的父母亲不会惩罚我们。
I wish our parents wouldn’t punish us ●It’s necessary /strange/ natural/ important + that从句中的动词要用虚拟，即（should）+动词原形（surprising、funny、right、wrong、better、a pity ，the shame ，no wonder）我们掌握一门外语是很重要的。
It is important that we ( should ) master a foreign language.奇怪她居然拒绝来参加晚会。
It is strange that she refuse to come to the party.我们努力学习是有必要的。
It’s necessary that we should study hard.Do you think it is necessary that he (should)not be sent to Lingbao.（should 表示“建议”的语气，可省。
）It is strange that such a person should be our friend.（should表示“竟然”的语气，不可省。
）It is a pity that he should be so careless.●在表从/状从中的应用他看上去象个外国人He looks as if he were a foreigner.她爱这个孩子就好像他是她的亲生儿子一样。
She loves the baby as if it were her own son.我记得整件事就好像发生在昨天一样。
I remember the whole thing as if it had happened yesterday.●在for fear that，in case，lest引导的从句中，若用虚拟语气时，从句谓语为：should+ do。
should不能省略She examined the door again for fear that a thief should come in.她又把门检查了一遍，以防盗贼的进入。
He started out earlier lest he should be late.他早早地就出发了以防迟到。
●在定从中的应用该是我们上床睡觉的时候了. It’s time that we went to bed.It’s time that we should go to bed.●情态动词＋have done表虚拟:should/ ought to + have done 表本该做，但实际没做shouldn’t/oughtn’t to + have done本不应做而做了needn’t + have done 本不必做而做了这花死了，我本该多浇水的。
The flower is dead. I should have given it more water汤姆本不该把你的秘密告诉我的。
Tom ought not to have told me your secret.你本不必来的，打个电话就可以了。
You needn’t have come here. You can just give me a phone call.●could + have done本来有能力做而实际没有做他本来可以拿第一的, 但他的腿受伤了.He could have taken the first place but his legs were injured.可能已经做过某事他可能把书弄丢了吗?Could he have lost the book?●may/might + have done本来有可能做而实际没有做他本来有可能得救的.He might have been saved.可能已经做过某事她可能在报上读到这件事了.She might have read about it in the papers.●表祝愿的虚拟语气：Heaven help him! God bless you!May you succeed! Long live the People’s Republic of China!。