?虚拟语气的使用主要体现在三个方面：虚拟条件句、虚拟语气在某些从句中的运用，以及
虚拟语气的一些特殊用法。
虚拟条件句:
?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及与将来事实相反的虚拟条件句。具体情况请看下表：
例句：
1.表示与现在事实相反
If I had enough money now ， I would lend it to you.
If I were you ， I would go to tell him the real feeling upon him. 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. She would have come to enjoy the party if she hadn't been very busy.
3.表示与将来事实相反
I would go shopping with you if it were to be Sunday tomorrow.
If he were to be given another chance to do it again， he could certainly achieve more.
1.虚拟条件句的倒装
为了强调语气，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：
If I had been in that situation， I would not have let the thief escape away with so much money. Had I been in that situation， I would not have let the thief escape away with so much money.
Should there be a drought， what should we do at that time ？ 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决定。 例如：
If we hadn't been working hard in the past few years ， things wouldn't be going so smoothly.
If the Party hadn 't led the Chinese people to liberate the country，Chinese people would still live a life in pain and poverty.
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。这种句子称为含蓄条件句。
例如：
But for the help from you ， I would not have had the chance to go to college.
I would never mind you making such loud noises， but， you see， my baby is in a deep sleep.
It was so quiet ； you could have heard a pin drop. 虚拟语气在某些从句中的运用
在某些词或短语后接的从句中要使用虚拟语气，表示愿望、建议或命令等。根据虚拟语气的形式不同，虚拟语气可以分为“should类”和“过去时态类”。
一、should类
这一类的虚拟语气是通过从句中的谓语动词使用“should +动词原形”体现出来的，should可以省略。其具体运用体现在：
1.在suggest ， order， demand ， propose，
command， request， desire，insist等表示建议、命令、要求、意见的动词后接的宾语从句中要使用虚拟语气。 如：
He suggests that she should leave the house at once.
The leader ordered that the task（should） be finished as soon as possible.
He proposed that we （should） deal with the problem by the view of development.
2.与suggest ， order， demand ， propose， command， request， desire，insist等动词相对应的名词suggestion， order， demand ， proposal 等后的表语从句或同位语从句中要使用虚拟语气。 如：
The general sent the order that the battle（should） be held on until the complete failure of the enemy.
My proposal is that we（should） set a deadline for handing in the plan.
3.在It is/was suggested （ordered ， demanded ， proposed ， etc. ） 结构以及necessary ， essential， important， strange， natural等形容词后的主语从句中要使用虚拟语气。
如：
It's requested that we （should） keep the stability of the society for the people's peaceful life.
It is necessary that the badly wounded man（should） be treated immediately. 二、过去时态类
英语中，还有一些词或短语后接的从句或句子，也要使用虚拟语气，虚拟语气是通过句中的谓语使用过去的某种时态（如：一般过去时、过去完成时等）来体现的。
1. wish ， would rather 后的宾语从句。 如：
He wished he had never been involved in such affairs. I would rather you could teach me again.
2. as if， as though引导的从句。如：
The little boy knows so many things as if he was a man. He acted as usual as though nothing had happened.
3.由if only （要是……，那该多好啊！）引导的惊叹句。如： If only I had passed the test ！ If only it stopped raining！
4. It is（about/high） time 后的定语从句。如： It is time we went out for a walk.
It was high time they had begun to prepare the experiment. 虚拟语气的其它用法
在英语中，一些表示建议、请求、劝告、愿望、祈祷、祝福或诅咒的句子，也需要使用虚拟语气。如：
Would you mind smoking here ？ May you be lucky！
Long live the people of China ！ God save me. 学位真题
?The new findings by the research crew suggested that the government’s housing plans_____not
practicable.
? A. be B. should be C. was D. were ?答案：D (2005学位真题)
?Tom Smith wished that his parents _____ in the stricken area when the earthquake occurred. ?A. were not B. are not ?C. have not been D. had not been ?答案：D (2005学位真题)
?The proposal that business companies_____guided by professionals for their new scheme of
developments was accepted without disagreement.
?A. be B. are ?C. was D. were ?答案：A (2005学位真题)
?Professor Wang said that he would rather his student Jane ____ to the conference. ?A. go B. went C. gone D. going ?答案：B (2005学位真题)
?If I ____ a book on the habits of mice, I’d not start working without sufficient observation on
them.
?A. were to write B. have written ?C. write D. am writing ?答案：A (2005学位真题)
_____, the police would have caught the criminal earlier.
?A. Had they received the clue in time ?B. If they received the clue in time
?C. They have received the clue in time ?D. Did they receive the clue in time ?答案：A (2005学位真题)
?_______ the interference from the local residents, the delegation would have caught the train
bound for Edinburgh.
?A. Due to B. Except for ?C. In case of D. But for ?答案：D (2005学位真题)
?All the participants believe that it is high time that the two neighboring countries ____ a fresh
round of negotiation regarding the economic cooperation.
?A. starting B. started ?C. have started D. being starting ?答案：B (2005学位真题)
?The suggestion that colleges _______ administrated by professors was approved by the board. ?A. is B. are C. be D. were ?答案：C (2006学位真题)
?The player asked he ＿＿＿ an opportunity to explain his case.
?A. gives B. be given ?C. is given D. should give ?答案：B (2007学位真题)
?The chairman insist that there＿＿＿ a meeting to be held within the shortest possible time. ?A. is
B. will be C. was
D. be
?答案：D (2007学位真题)
?My suggestion was that he ______ the offer as soon as possible. ?A. should take B. takes ?C. would take D. took ?答案：A (2007学位真题)
?If all the people in the world spoke the same language, cultural and economic ties _____ be much
closer among countries now.
?A. will B. should ?C. shall D. would ?答案：D (2007学位真题)
? I wish I _____ in the sun by a swimming pool instead of sitting in this classroom. ?A. have lain B. were lying C. lay D. lie ?答案：B (2008学位真题)
?It is essential that all the reports to be published _____ twice. ?A. be checked B. would be checked ?C. were checked D. will be checked ?答案：A (2008学位真题)
?_____ for their support, he would have gone penniless. ?A. If it is not B. If it is
?C. Were it D. Were it not
?答案：D (2009学位真题)
?I arrived late; I _____ the traffic to be so heavy this morning. ?A. wasn’t expecting ?B. wouldn’t expect ?C. haven’t expected