1、与现在事实相反：若与现在事实相反，条件从句的谓语用过去式(be通常用were)，主句谓语用“should (would, could, might)+动词原形”。
2、与过去事实相反：若与过去事实相反，条件从句的谓语用过去完成时(had+过去分词)，主句谓语用“should (would, could, might)+have+过去分词”。
3、与将来事实相反：若与将来事实相反，条件从句的谓语用过去式(be通常用were)，主句谓语用“should (would, could, might)+动词原形”。
扩展资料：
虚拟语气的应用条件：
在表示假想的虚假的、与事实相反的或难以实现的情况时用虚拟语气，表示主观愿望或某种强烈情感时，也用虚拟语气。即当一个人说话时欲强调其所说的话是基于自己的主观想法，愿望，假想，猜测，怀疑或建议，而不是根据客观实际，就用虚拟语气。主要是英语语法的一种表达。
条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表示的是假设或实际可能性不大的甚至完全不可能发生的情况，故采用虚拟语气。
参考资料来源：
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第1个回答 2019-11-12
虚拟语气是动词的一种特殊形式，用来表达说话人的愿望、请求、意图、建议、惊奇、设想等。
一、常用“may+动词原形”表示祝愿，但愿，此时may须置于句首（多用于正式文体中）。
1、May good luck be yours!祝你好运！
2、May you be happy!祝你快乐！
3、May you do even better!祝你取得更大成就！
4、May you have a good time. 祝愿你玩的痛快。
二、用动词原形。例如：
1、Long live the people! 人民万岁！
2、“God bless you,”said the priest.牧师说：“愿上帝保佑你！”
3、Have a good journey! 祝愿你旅途愉快！
扩展资料
1、虚拟语气在条件句中表示与将来事实相反或与将来事实可能相反，谓语动词的主要形式，主句would(sHould，could，might)+动词原形。
2、虚拟语气用于If only，一是一个省略了主句的条件句，用来表达某种强烈的不可能实现的愿望。
参考资料来源：百度百科-虚拟语气
本回答被网友采纳第2个回答 2020-08-07
主要取决于某些形容词和过去分词，用来表示建议、命令、要求、惊异和失望等。其形式为：(should)+动词原形。
2、表语从句和同位语从句中的虚拟语气
在表示建议、命令、主张、目的和愿望等名词后面的表语从句和同位语从句中谓语动词要求使用虚拟语气。其形式为：(should)+动词原形。
3、宾语从句中的虚拟语气
某些动词后所接宾语从句中的谓语动词要求用虚拟语气，用来表示建议、命令和要求等。其形式为：(should)+动词原形。
4、错综、混合虚拟语气
通常，在上面表格里反映的是非真实条件句的虚拟语气模式，从句和主句的谓语动词时间是一致的，如果两者时间不一致，此时就是混合型虚拟语气。
混合型虚拟语气的使用要求“各自为政”，即从句和主句根据各自假设的时间不同，采用上面表格中对应的的谓语动词形式。混合虚拟语气还有一种情况就是事实和虚拟假设的混合句，这样的句子不仅仅是时间的不同，而重要是事实和假设的混合。
5、含蓄虚拟语气
因为有时假设的情况并不是以if引导的条件从句形式出现，而是通过一些短语等形式暗示虚拟语气的存在，常用的词语有with, without, but for, otherwise, or，even, in case of, what if(如果…将如何)等等，这种句子往往有主句而无从句 (考试时多数情况是对过去的假设)。
本回答被网友采纳第3个回答 2020-03-17
虚拟语气用法：
1、条件状语从句中的应用：条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表示的是假设或实际可能性不大的甚至完全不可能发生的情况，故采用虚拟语气。
2、目的状语从句中的应用：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。
3、宾语从句中的应用：动词wish后接宾语从句时，从句谓语要用虚拟语气。若要表示与现在事实相反的愿望，从句谓语用一般过去时或过去进行时(同样be动词换成were)；
扩展资料：
宾语从句中的虚拟语气
1、某些动词后所接宾语从句中的谓语动词要求用虚拟语气，用来表示建议、命令和要求等。其形式为：(should)+动词原形。
2、在以it为形式宾语的复合宾语从句中也可以用虚拟语气，其形式为：(should)+动词原形。这一句型中使用的形容词(宾补)与主语从句中的虚拟语气所使用的形容词相同。
3、wish后面所跟的宾语从句中的虚拟语气表示某种不能实现的愿望。
参考资料来源：百度百科—虚拟语气
本回答被网友采纳第4个回答 推荐于2017-09-01
、虚拟条件句的三种基本类型：与现在事实相反、与过去事实相反、与将来事实相反。
条件句有真实条件句和非真实(虚拟)条件句两种。真实条件句所表示的假设是有可能发生的，而非真实条件句则通常表示一种假想，与事实相反或不大可能会发生：
If I have time, I will go with them. 假若我有时间，我就同他们去。(陈述语气)
If I were you, I would go with them. 假若我是你，我就同他们去。(虚拟语气)
▲ 与现在事实相反
若与现在事实相反，条件从句的谓语用过去式(be通常用were)，主句谓语用“should (would, could, might)+动词原形”：
If I knew her number ，I could ring her up. 要是我知道她的电话号码，我就可以给她打电话了。(可惜我不知道)
▲与过去事实相反
若与过去事实相反，条件从句的谓语用过去完成时(had+过去分词)，主句谓语用“should (would, could, might)+have+过去分词”：
If I’d left sooner，I’d have been on time. 要是我早点动身，我就准时到了。(但我动身太迟了)
▲与将来事实相反
若与将来事实相反，条件从句的谓语用过去式(be通常用were)，主句谓语用“should (would, could, might)+动词原形”：
If I asked him，I’m sure he’d help us. 如果我向他提出要求，肯定他会帮助我们。(不过我不打算这样做)
注：几点特别说明
① 主句谓语中的should主要用于第一人称后。would, might, could的大致区别是：would表示结果，might表示可能性，could表示能力、允许或可能性。比较：
If you tried again ，you would succeed. 要是你再试一试，你就会成功的。(would表结果)
If you tried again， you might succeed. 要是你再试一试，你可能会成功的。(might表可能)
If you tried again ，you could succeed. 要是你再试一试，你就能成功了。(could表能力)
④ 对于与将来事实相反的情形，请注意以下几点：一是这里说的与将来事实相反，实为对将来情况的推测；二是此用法中的条件从句谓语除用过去式外，有时也用“should+动词原形”(表示可能性极小，常译为“万一”)或“were to+动词原形”(表示与将来事实相反的假设)；三是当条件从句使用“should+动词原形”这样的谓语时，主句谓语除可用“should (would, could, might)+动词原形”这样的虚拟语气外，也可用直陈语气或祈使语气：
If it should rain tomorrow, don’t expect me. 万一明天下雨，就不要等我了。（祈使语气）
If I should see him, I’ll tell him. 万一我见到他，我就告诉他。（直陈语气）
2、错综时间虚拟条件句
所谓错综时间虚拟条件句即条件从句与主句所指时间不一致，如从句指过去，而主句即指的是现在或将来，此时应根据具体的语境情况，结合上面提到的三种基本类型对时态作相应的调整：
If it had rained last night, the ground would be wet now. 要是昨晚下过雨的话，现在地面就会是湿的。
You would be much better now if you had taken my advice. 假若你当时听我的话，你现在就会好多了。
3、两个常考虚拟语气句型
▲ 句型介绍
这两个句型是If it weren’t for…和If it hadn’t been for…，这是两个很常用的虚拟语气句型，也经常受到命题人的青睐，其意为“若不是(有)”“要不是有”。如：
If it weren’t for water, no plant could grow. 要是没有水植物就无法生长。
If it hadn’t been for your assistance ，we wouldn’t have succeeded.
=But for your assistance ，we wouldn’t have succeeded.
=Without your assistance ，we wouldn’t have succeeded.
5、wish后宾语从句用虚拟语气
▲ 用法说明
动词wish后接宾语从句时，从句谓语要用虚拟语气。若要表示与现在事实相反的愿望，从句谓语用一般过去时或过去进行时；若表示与过去相反的愿望，从句谓语用过去完成时或would / could+have +过去分词；若表示将来没有把握或不太可能实现的愿望，用would (could)＋动词原形。如：
注：特别注意
从句的时态只与从句所指的时间有关，而与wish的时态无关，比较：
I wish I were rich. 要是我现在有钱就好了。
I wish I had been rich. 要是那时我有钱就好了。
I wished I were rich. 当时我后悔自己没有钱。
I wished I had been rich. 当时我后悔自己曾经没有钱。
6、if only后的句子用虚拟语气
if only 与 I wish一样，也用于表示与事实相反的愿望，其后所虚拟语气的时态与 wish后所接时态的情况相同：
If only she had had more courage! 她再勇敢一些就好了。
If only I had listened to my parents! 我要是当时听了父母的话就好了。
If only she would go with me! 她要是愿意和我一道去就好了!
注：if only 通常独立使用，没有主句。
7、as if (though) 从句用虚拟语气
▲ 基本用法
以as if (as though)引导的方式状语从句或表语从句，有时用虚拟语气，若表示与现在事实相反，谓语动词用一般过去时；若表示与过去事实相反，用过去完成时；表示将来的可能性不大，用would (might, could)+动词原形：
He acts as if he knew me. 他显得认识我似的。
They treat me as though I were a stranger. 他们待我如陌生人。
He talks as if he had been abroad. 他说起话来好像曾经出过国。
注：两点说明
(1) 从句所表示的内容若为事实或可能为事实，也可用陈述语气：
It looks as if we’ll be late. 我们似乎要迟到了。
(2) 注意 It isn’t as if…的翻译：
It isn’t as if he were poor. 他不像穷的样子(或他又不穷)。
8、It’s time后的从句用虚拟语气
▲ 基本用法
从句谓语通常用过去式表示现在或将来，有时也用过去进行时或“should+动词原形”(较少见，且should不能省略)，其意为“(早)该干某事了”：
It’s time we went [were going, should go]. 我们该走了。
It’s time I was in bed. 我该上床睡了。(不用were)
9、would rather后句子用虚拟语气
在would rather, would sooner, would just as soon 后的that从句中, 句子谓语习惯上要用虚拟语气， 表示”宁愿做什么” ，具体用法为：
▲ 一般过去时表示现在或将来的愿望
I’d rather you went tomorrow (now). 我宁愿你明天(现在)去。
▲ 用过去完成时表过去的愿望
I’d rather you hadn’t said it. 我真希望你没有这样说过。
10、宾语从句用虚拟语气的10种类型
▲ I wish后的宾语从句
动词wish后接宾语从句时，从句谓语要用虚拟语气。若要表示与现在事实相反的愿望，从句谓语用一般过去时或过去进行时；若表示与过去相反的愿望，从句谓语用过去完成时或would / could+have +过去分词；若表示将来没有把握或不太可能实现的愿望，用would (could)＋动词原形。如：
I wish I could be of some use. 我希望我能有什么用处。
We wish he didn’t smoke. 我们希望他不吸烟。
I wish prices would come down. 我希望物价能降下来。
▲ 表示“坚持”后的宾语从句
主要是指insist的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
I insisted that he (should) stay. 我坚持要他留下。
注：动词insist后接宾语从句时，除可用虚拟语气外，也可用陈述语气，两者的区别是：若谓语动词所表示的动作尚未发生，或尚未成为事实，则用虚拟语气；若谓语动词所表示的动作已经发生，或已经成为事实，则要用陈述语气。比较：
He insisted that I had read his letter. 他坚持说我看过他的信。
He insisted that I should read his letter. 他坚持要我看他的信。
▲ 表示“命令”后的宾语从句
主要是指order, command的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
He ordered that it (should) be sent back. 他命令把它送回去。
▲ 表示“建议”后的宾语从句
主要是指advise, suggest, propose, recommend等的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
He suggested that we should leave early. 他建议我们早点动身。
注：与动词insist相似，动词suggest后接宾语从句时，除可用虚拟语气外，也可用陈述语气，两者的区别也是：若谓语动词所表示的情况尚未成为事实，则用虚拟语气，此时suggest通常译为“建议”；若谓语动词所表示的情况为既成事实，则要用陈述语气，此时的suggest通常译为“表明”、“认为”。比较并体会：
He suggested that we (should) stay for dinner. 他建议我们留下吃饭。
I suggested that you had a secret understanding with him. 我觉得你与他心照不宣。
▲ 表示“要求”后的宾语从句
主要是指ask, demand, require, request等后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
I ask that he leave. 我要求他走开。
He requires that I (should) appear. 他要求我出场。
▲ 表示“提议”“投票”后的宾语从句
主要是指move, vote等后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
I move that we accept the proposal. 我提议通过这项提案。
▲ 表示“敦促”后的宾语从句
主要是指动词urge后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
He urged that they go to Europe. 他敦促他们到欧洲去。
▲ 表示“安排”后的宾语从句
主要是指动词arrange后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
He arranged that I should go abroad. 他安排我去国外。
▲ 表示“希望”“打算”后的宾语从句
主要是指动词desire, intend后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
She desires that he do it. 她希望他做此事。
▲ 表示“指示”后的宾语从句
主要是指动词direct后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
The general directed that the prisoners should be set free. 将军指示释放那些俘虏。
11、主语从句中的虚拟语气
在It is necessary，important，strange，natural， advisable, anxious, compulsory, crucial, desirable, eager, essential, fitting, imperative(绝对必要), impossible, improper, obligatory, possible, preferable, probable, recommended, urgent, vital etc. ；it is a pity；It is requested/suggested/desired/proposed等结构后的主语从句中要用虚拟语气，即Should+动词原形或只用动词原形。如：
▲ It’s important…类
这一类型主要包括It is (was) important (necessary, desirable, imperative, advisable)that. . .句型。如：
It is impossible that he should go home. 他不可能会回家去。
▲ It’s a pity…类
It is a pity that she should fare so badly. 她竟吃得这么差，真可怜。
▲ It’s desired…类
这种主语从句还常用在It is (was) desired (suggested, settled, proposed, requested, decided, etc. ) that...句型。如：
It is requested that a vote be taken. 建议付诸表决。
12、表语从句、同位语从句中的虚拟语气
在advice, agreement, command, decision, decree, demand, determination, indication, insistence, order, preference, proposal, request, requirement, stipulation ，suggestion， idea，plan，order等名词后的表语从句、同位语从句中要用虚拟语气，即should+动词原形或只用动词原形。如：
Our suggestion is that you（ should）be the first to go． 我们的建议是你应该第一个去。
13、 在 lest ，for fear that( 以免) , in case (以防)引导的目的状语从句中的虚拟语气
在 lest ，for fear that( 以免) , in case (以防)从句中用should＋动词原形, should 可以省略.
She walked quietly lest she (should) wake up her roommates. 她走得很轻以免吵醒她的室友。
为方便记忆，表格对比
使用虚拟语气的主要句型 谓语动词的虚拟形式 例句
表现在的虚拟条件句 从句：用动词过去（be 多用were ） 1. If I were you, I should study English.
2. I would certainly go if I had time.
主句：would/should/could/might+动词原形
表过去的虚拟条件句 从句：had + PP 1. If you had taken my advice, you would not have failed in the test.
2. If I had left a little earlier, I would have caught the train.
主句：would/should/could/might +have + PP
表将来的虚拟条件句 从句：①用动词过去②should +V原③（were +to do ） 1. If it were to rain tomorrow, the meeting would be put off.
2. If you came tomorrow, we would have the meeting.
主句：would/should/could/might +have + PP
省略 if 的条件句 从句：用倒装形式，即把were,had等置于句首。(并只限were/ had)
主句：根据虚拟的情况采取与从句相应的形式。 1. Were I in school again(= If I were in school again, I would work harder.)
2. Were it not for the rain, (不能说Weren’t it for the rain, ) I would go swimming.
错综时间条件句（从句与主句所表示时间不一致） 根据从句与主句表示的不同时进行调整。 1.If you had worked hard yesterday, you would be tired now
2. If we hadn’t been working hard in the past few years, things woud be going so smoothly.
含蓄条件句（虚拟条件暗含在短语或上下文之中，从句不表现出来）(常见有but for“要不是” without等) 根据句子表达的实际情况选用相应的虚拟条件句中的主句的动词形式 1.Without air, there would be no living things.
2.I would have given you more help, but I was busy now.
名词性从句中的虚拟语气
wish, “可惜……”“……就好了”，“悔不该……”“但愿……” wish后从句：与表各种时间的虚拟条件句中的从句动词形式基本相同。
具体：1，表与现在不能实现的愿望，从句用“过去时，be 用were”
2.表与过去不能实现的愿望，从句用“had+PP 或 could/would +have +PP“
3. .表与将来不能实现的愿望，从句用“could/would +动词原形”
1.I wish I were a bird.
2. I wish I had known the answer..
would rather 后的宾语从句 would rather后从句：动词常用过去式 1. I would rather they came tomorrow
demand, insist,suggest, command, order, require, request, desire等一类动词后的宾语从句
（suggest表“暗示、隐含等”insist表“强调，力言等”不用虚拟语气。） 从句谓语用“should+动词原形”，should可省。 1. I suggest you (should)go at once.
2. He suggested that he patient’s leg should be cut and this suggested that he was not good at the case.(注意两个suggest的准确翻译)
“It is (was)+上述demand/suggest等动词过去分词（或important,natural,strange ,necessary等形容词）”后的主语从句 从句谓语用“should+动词原形”，should可省。 1. It ordered that the army (should) get there by 4 a.m.
2. It is necessary that she (should) be sent there at once.
order,suggestion,idea,plan, proposal, advice, demand等名词后的表语从句或同位语从句 从句谓语用“should+动词原形”，should可省。 His demand is that we (should )finish the work in 3 hours.
特殊形式的虚拟语气
as if 引导的从句（表示非真实时）但表真实时，不用虚拟语气。 与虚拟语气条件中从句动词形式基本相同。 1.Tom speaks as if he were a girl.
2.He looks as if he had been to Beijing.
so that, in order that引导的目的状语从句 May/might/should +V原 I live so that others may live better.
It is (the very/high)time that后的定语从句 从句谓语动词常用过去式，有时也可用should+动词原形 It is (high)time that we went (should go) to bed.
It is time that I were leaving.
省去主句的If only(要是……就好了)虚拟条件句 与wish后的宾语从句谓语形式相同。 If only I hadn’t lost the chance!
(= I wish I hadn’t lost the chance)
某些表祝愿的句子 常用原形或“May+动词原形” Long live world peace!
May you be happy1
表委婉客气的是常语句 情态动词的过去式+动词原形 Could I borrow your bike?
Would you please give me a hand?
虚拟语气的用法
虚拟语气表示一种假设的情况，或一种主观的愿望，即动词所表示的动作或状态并非事实，或不可能实现。英语虚拟语气的形式有下列几种：
一、与现在事实相反
连接词 条件从句 结果从句
If 1.动词过去式(或were)
2.助动词（过去式）+动词原形 Should
Would +动词原形
could
might
If had the time, John would make a trip to China to see the Great Wall.
If I were you, I would give up drinking immediately.
二.与将来事实相反
连接词 条件从句 结果从句
If 1. should+动词原形
2. 动词过去式
3、were to+动词原形 Should
Would +动词原形
could
might
If you should lose, what would you do?
If I were to see her tomorrow, I would tell her thetruth.
If you went there next time, you would see what I mean.
三、与过去事实相反
连接词 条件从句 结果从句
If had+过去分词 Should
Would + have+过去分词
could
might
If I’d dnown that it was going to rain, I would never have gone for a walk in the country.
四、虚拟语气的几种特殊用法
省掉if的条件从句结构：
Had you asked me, I would have told you. (=If you had asked me,…)
2.有时虚拟条件不用条件从句而用不定式、分词、介词、名词、连接词或定语从句来表示，如：
A true friend would not do such a thing.
(=If he were a true friend, he...)
(=If there were no water,…)
(=If you hadn’t helped me,…)
3. 有时条件从句中的动作和结果从句中的动作发生的时间不一致，如：
If he had followed the doctor’s advice, he would be quite all right now.
If I were you, I would have gone home.
五、虚拟语气的其他用法
1、Suggest, advise 等动词之后宾语从句须用虚拟语气，其句子结构如下：
suggest, advise, recommend, demand,
require, insist, urge, request, order, +that…(should )+动词原形
devide, ask, move, propose等
注意：在此结构中that不可省略；should省不省均可。
He suggested that they (should ) stop smoking.
上述动词的名词形式出现时，that 引导的从句仍用虚拟语气。
He made a request that they (should ) stop smoking.
如果that 引导的从句所表达的内容是事实，也可用陈述语气。
He insists that he is right.
2、It is (was )+necessary, a pity 等+that引导的从句须用虚拟语气，其句子结构如下：
imperative, advisable, 动词完成式
It is (was) + important,natural, necessary, +that…(should) +
essential, strange,等 动词原形
It is important that you (should) follow the doctor’s orders.
It is right that you should have done your homework.
3、wish的用法
动词过去式或were—与现在事实相反
主语+wish(that)+主语 + 动词过去完成式—与过去事实相反
助动词过去试+动词原形—与将来事实相反
I wish I were a pop singer. (=I am sorry I am not a pop singer..)
I wish I had never stopped teaching. (=I am sorry I stopped teaching.)
I wish they’d let us get some sleep.
注意：wish与hope接宾语从句的区别在于：hope表示一般可以实现的希望，宾语从句用陈述语气。wish表示很难或不大可能实现的希望,宾语从句用虚拟语气。试比较：
（1） We hope they will come,(We don’t know if they can come.)
（2） We wish they could come,(We know they are not coming.)
4、as if, as though, would(had) rather(that)引导的从句须用虚拟语气，如：
He acts as if nothing had happened.
I would rather you didn’t tell him.
5、It’s (high) time that…+动词过去式或should+动词原形，如：
It’s time (that) you had a hair cut.
It’s high time (that) we took some action.本回答被提问者采纳
条件句有真实条件句和非真实(虚拟)条件句两种。真实条件句所表示的假设是有可能发生的，而非真实条件句则通常表示一种假想，与事实相反或不大可能会发生：
If I have time, I will go with them. 假若我有时间，我就同他们去。(陈述语气)
If I were you, I would go with them. 假若我是你，我就同他们去。(虚拟语气)
▲ 与现在事实相反
若与现在事实相反，条件从句的谓语用过去式(be通常用were)，主句谓语用“should (would, could, might)+动词原形”：
If I knew her number ，I could ring her up. 要是我知道她的电话号码，我就可以给她打电话了。(可惜我不知道)
▲与过去事实相反
若与过去事实相反，条件从句的谓语用过去完成时(had+过去分词)，主句谓语用“should (would, could, might)+have+过去分词”：
If I’d left sooner，I’d have been on time. 要是我早点动身，我就准时到了。(但我动身太迟了)
▲与将来事实相反
若与将来事实相反，条件从句的谓语用过去式(be通常用were)，主句谓语用“should (would, could, might)+动词原形”：
If I asked him，I’m sure he’d help us. 如果我向他提出要求，肯定他会帮助我们。(不过我不打算这样做)
注：几点特别说明
① 主句谓语中的should主要用于第一人称后。would, might, could的大致区别是：would表示结果，might表示可能性，could表示能力、允许或可能性。比较：
If you tried again ，you would succeed. 要是你再试一试，你就会成功的。(would表结果)
If you tried again， you might succeed. 要是你再试一试，你可能会成功的。(might表可能)
If you tried again ，you could succeed. 要是你再试一试，你就能成功了。(could表能力)
④ 对于与将来事实相反的情形，请注意以下几点：一是这里说的与将来事实相反，实为对将来情况的推测；二是此用法中的条件从句谓语除用过去式外，有时也用“should+动词原形”(表示可能性极小，常译为“万一”)或“were to+动词原形”(表示与将来事实相反的假设)；三是当条件从句使用“should+动词原形”这样的谓语时，主句谓语除可用“should (would, could, might)+动词原形”这样的虚拟语气外，也可用直陈语气或祈使语气：
If it should rain tomorrow, don’t expect me. 万一明天下雨，就不要等我了。（祈使语气）
If I should see him, I’ll tell him. 万一我见到他，我就告诉他。（直陈语气）
2、错综时间虚拟条件句
所谓错综时间虚拟条件句即条件从句与主句所指时间不一致，如从句指过去，而主句即指的是现在或将来，此时应根据具体的语境情况，结合上面提到的三种基本类型对时态作相应的调整：
If it had rained last night, the ground would be wet now. 要是昨晚下过雨的话，现在地面就会是湿的。
You would be much better now if you had taken my advice. 假若你当时听我的话，你现在就会好多了。
3、两个常考虚拟语气句型
▲ 句型介绍
这两个句型是If it weren’t for…和If it hadn’t been for…，这是两个很常用的虚拟语气句型，也经常受到命题人的青睐，其意为“若不是(有)”“要不是有”。如：
If it weren’t for water, no plant could grow. 要是没有水植物就无法生长。
If it hadn’t been for your assistance ，we wouldn’t have succeeded.
=But for your assistance ，we wouldn’t have succeeded.
=Without your assistance ，we wouldn’t have succeeded.
5、wish后宾语从句用虚拟语气
▲ 用法说明
动词wish后接宾语从句时，从句谓语要用虚拟语气。若要表示与现在事实相反的愿望，从句谓语用一般过去时或过去进行时；若表示与过去相反的愿望，从句谓语用过去完成时或would / could+have +过去分词；若表示将来没有把握或不太可能实现的愿望，用would (could)＋动词原形。如：
注：特别注意
从句的时态只与从句所指的时间有关，而与wish的时态无关，比较：
I wish I were rich. 要是我现在有钱就好了。
I wish I had been rich. 要是那时我有钱就好了。
I wished I were rich. 当时我后悔自己没有钱。
I wished I had been rich. 当时我后悔自己曾经没有钱。
6、if only后的句子用虚拟语气
if only 与 I wish一样，也用于表示与事实相反的愿望，其后所虚拟语气的时态与 wish后所接时态的情况相同：
If only she had had more courage! 她再勇敢一些就好了。
If only I had listened to my parents! 我要是当时听了父母的话就好了。
If only she would go with me! 她要是愿意和我一道去就好了!
注：if only 通常独立使用，没有主句。
7、as if (though) 从句用虚拟语气
▲ 基本用法
以as if (as though)引导的方式状语从句或表语从句，有时用虚拟语气，若表示与现在事实相反，谓语动词用一般过去时；若表示与过去事实相反，用过去完成时；表示将来的可能性不大，用would (might, could)+动词原形：
He acts as if he knew me. 他显得认识我似的。
They treat me as though I were a stranger. 他们待我如陌生人。
He talks as if he had been abroad. 他说起话来好像曾经出过国。
注：两点说明
(1) 从句所表示的内容若为事实或可能为事实，也可用陈述语气：
It looks as if we’ll be late. 我们似乎要迟到了。
(2) 注意 It isn’t as if…的翻译：
It isn’t as if he were poor. 他不像穷的样子(或他又不穷)。
8、It’s time后的从句用虚拟语气
▲ 基本用法
从句谓语通常用过去式表示现在或将来，有时也用过去进行时或“should+动词原形”(较少见，且should不能省略)，其意为“(早)该干某事了”：
It’s time we went [were going, should go]. 我们该走了。
It’s time I was in bed. 我该上床睡了。(不用were)
9、would rather后句子用虚拟语气
在would rather, would sooner, would just as soon 后的that从句中, 句子谓语习惯上要用虚拟语气， 表示”宁愿做什么” ，具体用法为：
▲ 一般过去时表示现在或将来的愿望
I’d rather you went tomorrow (now). 我宁愿你明天(现在)去。
▲ 用过去完成时表过去的愿望
I’d rather you hadn’t said it. 我真希望你没有这样说过。
10、宾语从句用虚拟语气的10种类型
▲ I wish后的宾语从句
动词wish后接宾语从句时，从句谓语要用虚拟语气。若要表示与现在事实相反的愿望，从句谓语用一般过去时或过去进行时；若表示与过去相反的愿望，从句谓语用过去完成时或would / could+have +过去分词；若表示将来没有把握或不太可能实现的愿望，用would (could)＋动词原形。如：
I wish I could be of some use. 我希望我能有什么用处。
We wish he didn’t smoke. 我们希望他不吸烟。
I wish prices would come down. 我希望物价能降下来。
▲ 表示“坚持”后的宾语从句
主要是指insist的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
I insisted that he (should) stay. 我坚持要他留下。
注：动词insist后接宾语从句时，除可用虚拟语气外，也可用陈述语气，两者的区别是：若谓语动词所表示的动作尚未发生，或尚未成为事实，则用虚拟语气；若谓语动词所表示的动作已经发生，或已经成为事实，则要用陈述语气。比较：
He insisted that I had read his letter. 他坚持说我看过他的信。
He insisted that I should read his letter. 他坚持要我看他的信。
▲ 表示“命令”后的宾语从句
主要是指order, command的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
He ordered that it (should) be sent back. 他命令把它送回去。
▲ 表示“建议”后的宾语从句
主要是指advise, suggest, propose, recommend等的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
He suggested that we should leave early. 他建议我们早点动身。
注：与动词insist相似，动词suggest后接宾语从句时，除可用虚拟语气外，也可用陈述语气，两者的区别也是：若谓语动词所表示的情况尚未成为事实，则用虚拟语气，此时suggest通常译为“建议”；若谓语动词所表示的情况为既成事实，则要用陈述语气，此时的suggest通常译为“表明”、“认为”。比较并体会：
He suggested that we (should) stay for dinner. 他建议我们留下吃饭。
I suggested that you had a secret understanding with him. 我觉得你与他心照不宣。
▲ 表示“要求”后的宾语从句
主要是指ask, demand, require, request等后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
I ask that he leave. 我要求他走开。
He requires that I (should) appear. 他要求我出场。
▲ 表示“提议”“投票”后的宾语从句
主要是指move, vote等后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
I move that we accept the proposal. 我提议通过这项提案。
▲ 表示“敦促”后的宾语从句
主要是指动词urge后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
He urged that they go to Europe. 他敦促他们到欧洲去。
▲ 表示“安排”后的宾语从句
主要是指动词arrange后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
He arranged that I should go abroad. 他安排我去国外。
▲ 表示“希望”“打算”后的宾语从句
主要是指动词desire, intend后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
She desires that he do it. 她希望他做此事。
▲ 表示“指示”后的宾语从句
主要是指动词direct后的宾语从句，从句谓语由“should+动词原形”构成，其中的should在美国英语中通常可以省略。如：
The general directed that the prisoners should be set free. 将军指示释放那些俘虏。
11、主语从句中的虚拟语气
在It is necessary，important，strange，natural， advisable, anxious, compulsory, crucial, desirable, eager, essential, fitting, imperative(绝对必要), impossible, improper, obligatory, possible, preferable, probable, recommended, urgent, vital etc. ；it is a pity；It is requested/suggested/desired/proposed等结构后的主语从句中要用虚拟语气，即Should+动词原形或只用动词原形。如：
▲ It’s important…类
这一类型主要包括It is (was) important (necessary, desirable, imperative, advisable)that. . .句型。如：
It is impossible that he should go home. 他不可能会回家去。
▲ It’s a pity…类
It is a pity that she should fare so badly. 她竟吃得这么差，真可怜。
▲ It’s desired…类
这种主语从句还常用在It is (was) desired (suggested, settled, proposed, requested, decided, etc. ) that...句型。如：
It is requested that a vote be taken. 建议付诸表决。
12、表语从句、同位语从句中的虚拟语气
在advice, agreement, command, decision, decree, demand, determination, indication, insistence, order, preference, proposal, request, requirement, stipulation ，suggestion， idea，plan，order等名词后的表语从句、同位语从句中要用虚拟语气，即should+动词原形或只用动词原形。如：
Our suggestion is that you（ should）be the first to go． 我们的建议是你应该第一个去。
13、 在 lest ，for fear that( 以免) , in case (以防)引导的目的状语从句中的虚拟语气
在 lest ，for fear that( 以免) , in case (以防)从句中用should＋动词原形, should 可以省略.
She walked quietly lest she (should) wake up her roommates. 她走得很轻以免吵醒她的室友。
为方便记忆，表格对比
使用虚拟语气的主要句型 谓语动词的虚拟形式 例句
表现在的虚拟条件句 从句：用动词过去（be 多用were ） 1. If I were you, I should study English.
2. I would certainly go if I had time.
主句：would/should/could/might+动词原形
表过去的虚拟条件句 从句：had + PP 1. If you had taken my advice, you would not have failed in the test.
2. If I had left a little earlier, I would have caught the train.
主句：would/should/could/might +have + PP
表将来的虚拟条件句 从句：①用动词过去②should +V原③（were +to do ） 1. If it were to rain tomorrow, the meeting would be put off.
2. If you came tomorrow, we would have the meeting.
主句：would/should/could/might +have + PP
省略 if 的条件句 从句：用倒装形式，即把were,had等置于句首。(并只限were/ had)
主句：根据虚拟的情况采取与从句相应的形式。 1. Were I in school again(= If I were in school again, I would work harder.)
2. Were it not for the rain, (不能说Weren’t it for the rain, ) I would go swimming.
错综时间条件句（从句与主句所表示时间不一致） 根据从句与主句表示的不同时进行调整。 1.If you had worked hard yesterday, you would be tired now
2. If we hadn’t been working hard in the past few years, things woud be going so smoothly.
含蓄条件句（虚拟条件暗含在短语或上下文之中，从句不表现出来）(常见有but for“要不是” without等) 根据句子表达的实际情况选用相应的虚拟条件句中的主句的动词形式 1.Without air, there would be no living things.
2.I would have given you more help, but I was busy now.
名词性从句中的虚拟语气
wish, “可惜……”“……就好了”，“悔不该……”“但愿……” wish后从句：与表各种时间的虚拟条件句中的从句动词形式基本相同。
具体：1，表与现在不能实现的愿望，从句用“过去时，be 用were”
2.表与过去不能实现的愿望，从句用“had+PP 或 could/would +have +PP“
3. .表与将来不能实现的愿望，从句用“could/would +动词原形”
1.I wish I were a bird.
2. I wish I had known the answer..
would rather 后的宾语从句 would rather后从句：动词常用过去式 1. I would rather they came tomorrow
demand, insist,suggest, command, order, require, request, desire等一类动词后的宾语从句
（suggest表“暗示、隐含等”insist表“强调，力言等”不用虚拟语气。） 从句谓语用“should+动词原形”，should可省。 1. I suggest you (should)go at once.
2. He suggested that he patient’s leg should be cut and this suggested that he was not good at the case.(注意两个suggest的准确翻译)
“It is (was)+上述demand/suggest等动词过去分词（或important,natural,strange ,necessary等形容词）”后的主语从句 从句谓语用“should+动词原形”，should可省。 1. It ordered that the army (should) get there by 4 a.m.
2. It is necessary that she (should) be sent there at once.
order,suggestion,idea,plan, proposal, advice, demand等名词后的表语从句或同位语从句 从句谓语用“should+动词原形”，should可省。 His demand is that we (should )finish the work in 3 hours.
特殊形式的虚拟语气
as if 引导的从句（表示非真实时）但表真实时，不用虚拟语气。 与虚拟语气条件中从句动词形式基本相同。 1.Tom speaks as if he were a girl.
2.He looks as if he had been to Beijing.
so that, in order that引导的目的状语从句 May/might/should +V原 I live so that others may live better.
It is (the very/high)time that后的定语从句 从句谓语动词常用过去式，有时也可用should+动词原形 It is (high)time that we went (should go) to bed.
It is time that I were leaving.
省去主句的If only(要是……就好了)虚拟条件句 与wish后的宾语从句谓语形式相同。 If only I hadn’t lost the chance!
(= I wish I hadn’t lost the chance)
某些表祝愿的句子 常用原形或“May+动词原形” Long live world peace!
May you be happy1
表委婉客气的是常语句 情态动词的过去式+动词原形 Could I borrow your bike?
Would you please give me a hand?
虚拟语气的用法
虚拟语气表示一种假设的情况，或一种主观的愿望，即动词所表示的动作或状态并非事实，或不可能实现。英语虚拟语气的形式有下列几种：
一、与现在事实相反
连接词 条件从句 结果从句
If 1.动词过去式(或were)
2.助动词（过去式）+动词原形 Should
Would +动词原形
could
might
If had the time, John would make a trip to China to see the Great Wall.
If I were you, I would give up drinking immediately.
二.与将来事实相反
连接词 条件从句 结果从句
If 1. should+动词原形
2. 动词过去式
3、were to+动词原形 Should
Would +动词原形
could
might
If you should lose, what would you do?
If I were to see her tomorrow, I would tell her thetruth.
If you went there next time, you would see what I mean.
三、与过去事实相反
连接词 条件从句 结果从句
If had+过去分词 Should
Would + have+过去分词
could
might
If I’d dnown that it was going to rain, I would never have gone for a walk in the country.
四、虚拟语气的几种特殊用法
省掉if的条件从句结构：
Had you asked me, I would have told you. (=If you had asked me,…)
2.有时虚拟条件不用条件从句而用不定式、分词、介词、名词、连接词或定语从句来表示，如：
A true friend would not do such a thing.
(=If he were a true friend, he...)
(=If there were no water,…)
(=If you hadn’t helped me,…)
3. 有时条件从句中的动作和结果从句中的动作发生的时间不一致，如：
If he had followed the doctor’s advice, he would be quite all right now.
If I were you, I would have gone home.
五、虚拟语气的其他用法
1、Suggest, advise 等动词之后宾语从句须用虚拟语气，其句子结构如下：
suggest, advise, recommend, demand,
require, insist, urge, request, order, +that…(should )+动词原形
devide, ask, move, propose等
注意：在此结构中that不可省略；should省不省均可。
He suggested that they (should ) stop smoking.
上述动词的名词形式出现时，that 引导的从句仍用虚拟语气。
He made a request that they (should ) stop smoking.
如果that 引导的从句所表达的内容是事实，也可用陈述语气。
He insists that he is right.
2、It is (was )+necessary, a pity 等+that引导的从句须用虚拟语气，其句子结构如下：
imperative, advisable, 动词完成式
It is (was) + important,natural, necessary, +that…(should) +
essential, strange,等 动词原形
It is important that you (should) follow the doctor’s orders.
It is right that you should have done your homework.
3、wish的用法
动词过去式或were—与现在事实相反
主语+wish(that)+主语 + 动词过去完成式—与过去事实相反
助动词过去试+动词原形—与将来事实相反
I wish I were a pop singer. (=I am sorry I am not a pop singer..)
I wish I had never stopped teaching. (=I am sorry I stopped teaching.)
I wish they’d let us get some sleep.
注意：wish与hope接宾语从句的区别在于：hope表示一般可以实现的希望，宾语从句用陈述语气。wish表示很难或不大可能实现的希望,宾语从句用虚拟语气。试比较：
（1） We hope they will come,(We don’t know if they can come.)
（2） We wish they could come,(We know they are not coming.)
4、as if, as though, would(had) rather(that)引导的从句须用虚拟语气，如：
He acts as if nothing had happened.
I would rather you didn’t tell him.
5、It’s (high) time that…+动词过去式或should+动词原形，如：
It’s time (that) you had a hair cut.
It’s high time (that) we took some action.本回答被提问者采纳
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