英语中含有虚拟语气的语法
虚拟语气
一、考点聚焦
1、虚拟语气用于条件状语从句中
（1）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”。如：
If I were a boy, I would join the army.
If the had time, she should go with you.
（2）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：
If he had taken my advice, he would have succeeded in the competition.
（3）表示与将来事实相反，条件状语从句中的谓语动词一般过去时或should(were to) + 动词原形，而主句中的谓语动词则用would / should/
could might + 动词原形。如；
If it were to rain tomorrow, the football match would be put off.
（4）当条件状语从句表示的行为和主句表示的行为所发生的时间不一致时，动词的形式要根据它所表示的时间作相应调整。如：
If they had worked hard, they would be very tired.(从句说的是过去，主句指的是现在)
以下表格是虚拟语气用于条件状语从句中时，主句和从句谓语动词的形式：
条件状语从句主 句
与过去事实相反had + 过去分词should /would/could/might + have + 过去分词
与现在事实相反一般过去时(be用were)would/should/could/might + 动词原形
与将来事实相反一般过去时或should(were to) + 动词原形Would/should/cold/might + 动词原形
有时侯在使用时可省略if,句子则可换成下列形式，即“were / had / should +主语”。如：
Were I a boy, I would join the army.
Had he taken my advice, he would have succeeded.
Were it not for the expense, I would go to Britain.
2、虚拟语气用于名词性从句
（1）虚拟语气在宾语从句中的运用。
①“wish + 宾语从句”表示不能实现的愿望，译为“要是……就好了”等。表示现在不能实现的愿望，从句中的谓语动词用一般过去时；表示将来不能实现的愿望，从句中的谓语动词用“would/could + 动词原形”；表示过去不能实现的愿望，从句中的谓语动词用“had + 过去分词”或“could(should) + have + 过去分词”。如：
I wish it were spring all the year round.
I wish I had known the answer.
I wish I could fly like a bird.
②在表示建议、要求、命令等的动词suggest、advise、propose、demand、require、insist request、command、order等后的宾语从句中，谓语动词用should + 动词原形或是动词原形。如：
She suggested we (should)leave here at once.
The doctor ordered she should be operated.
（2）虚拟语气在同位语从句和表语从句中的运用。
作表示建议、要求、命令等的名词advise、idea、order、demand、plan、proposal、suggestion、request等的表语从句和同位语从句，从句中的谓语动词用“（should） + 动词原形”。如：
His suggestion that we (should)go to Shanghai is wonderful.
My idea is that they (should)pay 100 dollars.
（3）虚拟语气在主语从句中的运用。
在主语从句中，谓语动词的虚拟语气用“should + 动词原形”的结构，表示惊奇、不相信、理应如此等。如：
It is necessary(important, natural, strange, etc.)that we should clean the room every day.
It was a pity (a shame, no wonder, etc.)that you should be so careless.
It will be desired(suggested, decided, ordered, requested, proposed, etc.)that she should finish her homework this afternoon.
注意：这种从句表示的是事实。如果说人对这种事实表现出惊奇的情感，就可用虚拟语气。反之，如果不表示惊奇等情感，that从句也可用陈述句语气。如：
It is pity that you can’t swim.
3、虚拟语气在其他场合的运用
（1）虚拟语气在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。如：
He did it as if he were an expert.
Even if she were here, she could not solve the problem.
（2）虚拟语气用于定语从句中。
这种从句常用于句型“It is (high)time (that) … ”中，定语从句的谓语动词用一般过去时(be用were)或should + 动词原形，意思是“(现在)该……”。如：
It’s time that I picked up my daughter.
It’s high time we were going.
（3）虚拟语气用在if only引导的感叹句中。如：
If only I were a bird.
If only I had taken his advice.
（4）虚拟语气在一些简单句中的运用。
①情态动词的过去式用于现在时态时，表示说话人谦虚、客气、有礼貌或语气委婉，常出现在日常会话中。如：
It would be better for you not to stay up too late.
Would you be kind enough to close the door?
②用于一些习惯表达法中。如：
Would you like a cup of tea?
I would rather not tell you.
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。
一、考点聚焦
1、虚拟语气用于条件状语从句中
（1）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”。如：
If I were a boy, I would join the army.
If the had time, she should go with you.
（2）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：
If he had taken my advice, he would have succeeded in the competition.
（3）表示与将来事实相反，条件状语从句中的谓语动词一般过去时或should(were to) + 动词原形，而主句中的谓语动词则用would / should/
could might + 动词原形。如；
If it were to rain tomorrow, the football match would be put off.
（4）当条件状语从句表示的行为和主句表示的行为所发生的时间不一致时，动词的形式要根据它所表示的时间作相应调整。如：
If they had worked hard, they would be very tired.(从句说的是过去，主句指的是现在)
以下表格是虚拟语气用于条件状语从句中时，主句和从句谓语动词的形式：
条件状语从句 主 句
与过去事实相反 had + 过去分词 should /would/could/might + have + 过去分词
与现在事实相反 一般过去时(be用were) would/should/could/might + 动词原形
与将来事实相反 一般过去时或should(were to) + 动词原形 Would/should/cold/might + 动词原形
有时侯在使用时可省略if,句子则可换成下列形式，即“were / had / should +主语”。如：
Were I a boy, I would join the army.
Had he taken my advice, he would have succeeded.
Were it not for the expense, I would go to Britain.
2、虚拟语气用于名词性从句
（1）虚拟语气在宾语从句中的运用。
①“wish + 宾语从句”表示不能实现的愿望，译为“要是……就好了”等。表示现在不能实现的愿望，从句中的谓语动词用一般过去时；表示将来不能实现的愿望，从句中的谓语动词用“would/could + 动词原形”；表示过去不能实现的愿望，从句中的谓语动词用“had + 过去分词”或“could(should) + have + 过去分词”。如：
I wish it were spring all the year round.
I wish I had known the answer.
I wish I could fly like a bird.
②在表示建议、要求、命令等的动词suggest、advise、propose、demand、require、insist request、command、order等后的宾语从句中，谓语动词用should + 动词原形或是动词原形。如：
She suggested we (should)leave here at once.
The doctor ordered she should be operated.
（2）虚拟语气在同位语从句和表语从句中的运用。
作表示建议、要求、命令等的名词advise、idea、order、demand、plan、proposal、suggestion、request等的表语从句和同位语从句，从句中的谓语动词用“（should） + 动词原形”。如：
His suggestion that we (should)go to Shanghai is wonderful.
My idea is that they (should)pay 100 dollars.
（3）虚拟语气在主语从句中的运用。
在主语从句中，谓语动词的虚拟语气用“should + 动词原形”的结构，表示惊奇、不相信、理应如此等。如：
It is necessary(important, natural, strange, etc.)that we should clean the room every day.
It was a pity (a shame, no wonder, etc.)that you should be so careless.
It will be desired(suggested, decided, ordered, requested, proposed, etc.)that she should finish her homework this afternoon.
注意：这种从句表示的是事实。如果说人对这种事实表现出惊奇的情感，就可用虚拟语气。反之，如果不表示惊奇等情感，that从句也可用陈述句语气。如：
It is pity that you can’t swim.
3、虚拟语气在其他场合的运用
（1）虚拟语气在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。如：
He did it as if he were an expert.
Even if she were here, she could not solve the problem.
（2）虚拟语气用于定语从句中。
这种从句常用于句型“It is (high)time (that) … ”中，定语从句的谓语动词用一般过去时(be用were)或should + 动词原形，意思是“(现在)该……”。如：
It’s time that I picked up my daughter.
It’s high time we were going.
（3）虚拟语气用在if only引导的感叹句中。如：
If only I were a bird.
If only I had taken his advice.
（4）虚拟语气在一些简单句中的运用。
①情态动词的过去式用于现在时态时，表示说话人谦虚、客气、有礼貌或语气委婉，常出现在日常会话中。如：
It would be better for you not to stay up too late.
Would you be kind enough to close the door?
②用于一些习惯表达法中。如：
Would you like a cup of tea?
I would rather not tell you.
对现在的事实相反，从句+过去式be用were，不用was，主句+would/should+动词原形
if i knew him, i would ask Tim to lend us some money.
对过去的事实相反，从句过去完成时had done，主句++would/should+完成时have done
if i had been there，we would have had a good time.
对将来事实相反，从句+were to/should 动词原形， 主句+would+动词原形
if it weren't raining tomorrow, we would go to picnic.
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