虚拟语态的概述

虚拟语态是什么啊~

一、概念

[Subjunctive Mood]
中文译作"虚拟语气"。它是一种动词形式，表示说话人的某种假设、愿望、怀疑、猜测、建议等含义。


二、语法结构
1.if结构（非真实条件句——表示的是假设的或实际可能性不大的情况）

与..事实相反 If从句 主句
过去 Had done Would* have done
现在 Were/did Would* do
将来 Should do/were/were to do Would* do

例句：If there hadn’t been much rain in spring, we would have had a good harvest now. [过去]
If he smoked less, his cough might be well soon. [现在]
If the lecturer should be late, you would have to make a speech first. [将来]

备注：
（1）上表中’*’，would都可转换为should、could、might。
（2) 如果为时间错综句的话，左右两栏可互相搭配，排列组合。
例句：
He would still be alive today if he hadn’t taken that drug.
[与现在事实相反] [与过去事实相反]

(3) if可转换为其他形式
例句：Without your advice, our meeting wouldn’t have been so successfully. [过去]
（=>可转换为：If there hadn’t been your advice, we …）
Your notes are almost illegible (难以辨认的). Notes typed out would be a lot easier to read. [将来]
(=> 可转换为：If the notes had been typed out, it would be a lot easier to read.)
I should have gone to see Dr. Smith and he might have cured me of the disease.[过去]
(=> 可转换为：If he have gone to see Dr. Smith, he ..)

2、wish结构

与..事实相反
过去 Had done
现在 Were/did
将来 Would

备注：可转换为其他形式。
例句：He talks as if (好像) he had done all the work himself. [过去]
I wish I were a bird.
I wish he handn' done that.
I wish I would be rich in the future.
3、should结构
从句中用“should + 动词原形”构成。而且should可以省去。用于此结构的动词有：advise, direct, agree, ask, demand, decide, desire, insist, order, prefer, propose, request, suggest,intend等。
例句：The teacher suggest he (should) read English aloud.

注意：当insist表示“坚持认为”、suggest表示“表明，显示”时，不用虚拟语气。

例句：The look on his face suggested that he was quite satisfied with what I had done for him.

He insisted that he was honest.

4、would rather ＋从句
在这种结构中，从句的谓语动词用过去形式表示虚拟。

例句：I would rather you did this instead of me.

5、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是：necessary, good, important, right, wrong, better, natural, proper, funny,
strange, surprising ．

一些名词也可以用于 在该结构中。如：a pity， no wonder．．．．

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。

3）It is time（about time， high time）that ．．．（过去式动词形式或should＋动词原形）．．．．

It is high time I went home now. = It is high time I should go home now.

6、表语从句、同位语从句中的虚拟语气
在suggestion， proposal， order， plan， idea， advice， decision等需要有内涵的名词后面的表语从句、同
位语从句中，要使用虚拟语气。其谓语动词应用：should＋原形动词。另外连接从句的that不能省
略。

例：My suggestion is that we should go there at once.

What do you think of his proposal that we should put on a play at the English evening?




三、使用范围及判断
1、虚拟语气表示一种不能实现的假设。该语法主要用于if条件状语从句。也可用于主语从句、表语从句、宾语从句等。

2、if条件状语从句中虚拟语气的判断

判断是真实条件句还是非真实条件句。只有在非真实条件句中才使用虚拟语气。通过句子意思，看假设的条件是否能够实现，能够实现是真实条件句，不能使用虚拟语气；假设的条件不能实现则是非真实条件句，要用虚拟语气。

判断这个假设是与哪个事实相反。通常有三种情况：①与过去事实相反。②与现在事实相反。③与将来事实可能相反。

3、“后退一步法”

后退一步法是指在准确地判断了该句与哪一事实相反后，按虚拟语气的后退一步法处理从句谓语动词的时态。即：在非 真实条件状语从句中，谓语动词按正常情况“后退一步”。也就是：

1）与过去事实相反，在从句中用过去完成时形式表示。

2）与现在事实相反，在从句中用过去一般时形式表示。

3）与将来事实可能相反，在从句中用过去将来时形式表示。

主句中则用情态动词would, should, could 等加一个与从句一致的动词形式。

例：If I had come her yesterday, I would have seen him.

If I were a teacher, I would be strict with my students.

If it should snow tomorrow, they couldn’t go out.

四、注意事项

1.if条件句中如有were, should, had，可以省去if，并使用倒装语序。

2、在现代英语中if条件状与从句中的谓语动词如果是be其过去形式一般用were。

3、wish 后面宾语从句中的虚拟语气，按“后退一步法”处理从句的谓语动词。注意：与哪个事实相反，不能以主句的时态为判断依据，而是根据从句的意义判断。

1）对过去情况的虚拟，句子用过去完成时。
如：If only I had taken his advice！
2）对现在情况的虚拟，句子用一般过去时/过去进行时。 如果是be动词的话用were
如：If only I were a billionaire!
If only I were dreaming!
3）对将来的情况虚拟，句子用过去将来时。
如：If only I would fly tomorrow!

1．虚拟语气在条件句中的用法

（1）若表示与现在事实相反的假设，则条件从句中用过去式，主句中用过去将来式（would，should，could，might + 动词原形）；若表示某事将来实现的可能性不大，则条件从句中用should + 动词原形也可用“were to+动词原形”或用过去式动词。如：

J I would certainly go if I had time．（现在）

J If it should rain，we wouldn't go out.（将来）

J If I knew German，I would read the paper to you．（现在）

J If he were here，we could ask him．（现在）

（2）若表示与过去事实相反的假设，从句中用过去完成式，主句中用过去将来完成式（should，would，could，might + have + 过去分词）。如：

J If I had set off a little earlier， I would have caught the train．

J She would / might have come if she hadn't been so busy．

J If I hadn't taken your advice，I would have made a bad mistake．

J If only you hadn't told him the news．

（3）含有虚拟语气的条件状语从句中，如有had，should，were 这三个词的话，在正式或书面语言中可将if省略，再将句子的主语和谓语动词实行全部倒装或部分倒装。如：

J Had they time（=If they had time），they would certainly come and help us．

J Should it be fine（=If it should be fine），we would go for an outing．

J Were I go（=If I were you）， I would go．

（4）若主句从句所指的时间不一致，即条件从句表示与过去事实相反，主句表示与现在事实相反；或者条件从句表示与现在事实相反，主句表真实情况，则从句中应采用与具体时间相对应的虚拟形式。如：

J If it had rained last night（过去），It would be very cold today（现在）．

J If I had taken your advice（过去），I should have no trouble with the work now（现在）．

2．虚拟语气在宾语从句中的用法

在动词suggest，order，demand，propose，request，command，insist等后的宾语从句中，用虚拟语气（即Should+动词原形或只用动词原形）来表示愿望、建议、命令、请求等。在动词wish /would rather后的宾语从句中，用过去式表示与现在事实不符，用过去完成式表示与过去事实不符。如：

J I suggest that we（should）set off at once．

JThe doctor insisted that the patient (should)be X-rayed．

JI wish I were as strong as you．

J I would rather that you hadn't told him．

3．虚拟语气在主语从句中的用法

在It is necessary/important/strange/natural；It is requested/suggested/desired/proposed；it is a pity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：

J It is necessary that he（should）be sent there at once．

JIt is requested that Professor Li（should）give us a speech．

JIt is desired that we（should）get everything ready by tonight．

4．虚拟语气在表语从句、同位语从句中的用法。

在 suggestion， proposal，idea，plan，order，advice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：

J Our suggestion is that you（ should）be the first to go．

J My advice is that we（should）send for Doctor Li．

J Do you know the order that you（should）keep watch？

5．虚拟语气在其他状语从句中的用法

在as if引导的状语从句中，用过去式表示与现在事实不符，用过去完成式表示与过去事实不符；在so that，in order that引导的状语从句中，常用should/would/could/might+动词原形来表示虚拟语气。如：

JThey talked as if they had been friends for years．

J She stayed at home for a few days so that she could take care of her mother．

J He took a taxi to the station so that she should not miss the train．

6．虚拟语气在定语从句中的用法：

在it is time后面的定语从句中常用过去式表示虚拟。

J It’s time I was going.

J It’s time somebody taught you to behave yourself.

昨天向一位老外朋友请教，不小心知道了虚拟语气的一些新变化，所以不敢独享，马上发上来供大家参考。

先说说我的问题吧。关于hope和wish用法上的区别。举一个例子就很容易理解了。

I hope I can be a millionaire.

I wish I could be a millionaire.

用法上的区别显而易见了，所以不多解释了。然后就涉及到了虚拟语态的问题。因为我们讲到一句句子：

If I was you, ....

看到这句，相信不少人会说，错错错错错！！！！！！和我当时一样的反应拉。。然后老外告诉我，这是对的，而且现在越来越倾向于用If I was you,....而不是If I were you,....

他是这样解释的：
拿上面的例句来解释，I wish I could be a millionaire. 中的could可以看作can的过去式。那么am的过去式是什么呢？WAS！所以咯。（注意，这句句子中wish后面的从句可以看作虚拟语态）

不过，我们的英语老师们还是告诉我们，If I were you,....现在这种说法也是对的，maybe it will be out of date some day. 考试的时候嘛，学生朋友们还是用were保险点吧。呵呵。。。

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