概念：动词虚拟语气表示说话人的愿望, 假设, 猜测, 建议, 请求, 意图, 设想等未能或不可能成为事实的情况, 或者在说话人看来实现可能性很小的情况, 而不表示客观存在的现实。
表现形式：通过句中谓语动词的特殊形式来表现. 这些特殊形式与谓语动词的某些时态相同, 但它们只表示语气, 而不表示时态, 但含有一定的时间概念。
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高中英语研究中心：专题四 虚拟语气
一、在简单句中的用法
1. 表示祝愿
//例句//
a. Long live our country.
b. May you succeed.
c. May you be happy all your life.
2. 表示命令
Everybody leave the room.
二、在非真实条件句中的用法
使用虚拟语气的含条件句的复合句称为非真实条件句。
1.表示与现在事实相反的情况时
表示与现在事实相反的情况时, if从句的谓语用动词的过去式。
(be动词的过去式多用were, 而不用was)
主句的谓语用should / would / could / might +动词原形。
(should多用于第一人称, would多用于二三人称, could / might可用于所有人称)
a. If I had more time, I should study computer better.
b. If he were not so busy, he would attend the meeting this afternoon.
c. If they didn’t take exercises every day, they wouldn’t be so healthy.
d. If you went to bed earlier, you would not be so sleepy in the morning.
e. If she invited me, I should go to the party.
2.表示与过去事实相反的情况时
表示与过去事实相反的情况时，if从句的谓语用had done形式,
主句的谓语用should / would / could / might + have done的形式。
a. If she had invited me yesterday, I should have gone to the party.
b. I would have checked my paper again if I had had more time at yesterday’s exam.
c. If you had taken the teacher’s advice, you would not have failed in the exam.
3. 表示与将来事实相反的情况时
(1).完全动词过去式 (be的过去式通常用were);
(2). should +动词原形;
(3).were to do. 其中(2)、(3)的情况都含有出乎意料之外之意;
主句的谓语的形式是: should / would / could / might +动词原形
a. If she should invite me tomorrow, I should go to the party.
b. If it rained / should rain / were to rain tomorrow, our picnic would be put off.
c. If I saw him tomorrow, I would pass your note to him.
d. I might come back if I were to miss the train.
三、在非真实条件句中的变体
1. 条件从句省略if
在书面语中, 如果条件从句中的谓语中有were, had, should等词,
可将if省略, 而把were, had, should放在句首。
a. Were I you (=If I were you ), I would get up very early.
b. Had you arrived (=If you had arrived ) at the station ten minutes earlier yesterday, you could have caught the train.
2.省略条件从句或主句
省略条件从句或主句, 省略部分的含义仍有所体现。省略主句时, 表示己不能实现的愿望。
a. You could have done it yourself (if you had wanted to).
b. I wouldn’t smoke (if I were you).
c. If my old friends were with me! (要是老朋友和我在一起该多好啊)
d. If you had seen the wonderful film!
3.主从句时间不一致
主从句时间不一致时, 主从句谓语动词的形式取决于要表示的具体时间。
a. You would speak English well if you had practised every day.
b. If she hadn’t trained so hard, she wouldn’t be able to run so fast.
4.含蓄条件句
假设的条件不以条件从句, 而以其他方式如介词短语、从句等表达出来,这种句子称为含蓄条件句。
a. What would you do with a million dollars?
b. Without music, the world would be a dull place.
c. We could have done better with more money.
d. He would have given you more help, but he has been so busy.
四、在状语从句中的用法
1.even if / though
在even if / though引导的让步状语从句中，若表示与事实相反, 可用虚拟语气形式。
主从句的谓语动词形式与非真实条件句相同。
Even if I were rich, I would work.
2.as if / though
在as if / though引导的方式状语从句中，表示与事实情况相反的猜测，常用虚拟语气。
(1).表示与现在事实相反或对相在情况有所怀疑, 谓语用过去式
a. He speaks English so well as if she had studied it in England.
b. She looked as if she were ill.
(2).表示与过去事实相反的情况, as if / though从句谓语用过去完成式
a. The machines operated as if it had been repaired.
3.so that, in order that
在so that, in order that引导的目的状语从句中，从句表目的性，谓语使用情态动词+动词原形。
a.We had a meeting so that we could find out what to do next month.
b.We took a taxi in order that we could get there on time.
五、在主语从句中的用法
如果表示说话人的看法, 想法或意见, 在句型 It is / was + adj. + that从句中,主语从句中可用虚拟语气. 主语从句中谓语动词用should do表示现在或将来情况,用should have done表示过去情况。
a. It is necessary that you should clean the lab before you left.
b. It is important that you should take the doctor’s advice.
c. It was very strange that he should have left without say goodbye.
六、在宾语从句中的用法
1. wish
在wish的宾语从句中, 通常表示不可能实现或没有实现的愿望, 常用虚拟语气。
(1).wish的宾语从句用过去式, 表示现在或将来没有实现或不可能实现的愿望。
a. I wish I knew the result of the match now.
b. I wish it were spring here all the year round.
c. I wish I could help you.
d. I wish I were young.
(2).wish的宾语从句用过去完成式, 表示过去没有实现或不可能实现的愿望。
a. We wish we had got the film tickets last night.
b. I wish you I had met him yesterday.
(3).wish的宾语从句若用would, 则一般表示请求, 对现状不满或希望未来有所改变。
a. I wish the prices would come down.
b. I wish you would help me.
c. I wish he would be more careful.
d. We wish you would spend the holiday with us.
2.与动词结合的情况
在动词suggest (建议), advise (建议), demand (要求), require (要求), order (命令), insist (坚持)后的宾语从句中, 谓语动词常用( should )+动词原形的虚拟语气形式。
a. I suggested that we should go there at once.
b. I demand that he should answer me at once.
c. The doctor insisted that the patient should stay in bed for two weeks.
d. The officer ordered that the soldiers should stop playing.
3.与名词结合的情况
与名词suggestion（建议）， advice （建议）， demand（要求）， request（要求）， order（命令）有关的从句(包括同位语从句和表语从句等)中的谓语也用 ( should ) +动词原形。
a. The black people made a strong demand that the government ( should ) take steps to change the unfair situation.
b. Their demand is that the government should take steps to change the unfair situation.
c. It was Bill’s suggestion that everybody should have a map.
d. His suggestion was that everybody should have a map.
七、在句型: It is time that中
虚拟语气用在句型: It is time that(该做某事了)中:that从句中的谓语动词用过去式。
It is time we got up.
八、在if only引导的感叹句中
虚拟语气用在if only引导的感叹句中:
表示但愿, 要是......就好了, 其中谓语形式与wish的宾语从句相同。
a. If only he didn’t drive so fast! ( =I wish he didn’t drive so fast.)
b. If only he had taken the doctor’s advice. ( =I wish he had taken the doctor’s advice.)
c. If only the rain would stop! ( =I wish the rain would stop.)
九、在简单句中的用法
虚拟语气用在would rather / prefer后的that从句中:表示现在或将来情况谓语动词用过去时形式, 表示过去情况动词用过去完成时形式。
a. I would rather he came next Saturday.
b. I would prefer you had seen the film yesterday.
c. I would rather that he painted the house blue
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