我想请专家老师给我详细讲解一下虚
语法教学材料:虚拟语气
虚拟语气表示说话人的愿望、假设、猜测或建议，而不表示客观存在的事实。虚拟语气通过谓语动词的特殊形式来表示，下面对虚拟语气在各种句式中的用法分别介绍。
虚拟语气用于条件状语从句。
表示与现在事实相反的假设时，条件状语从句中的谓语动词用“过去式（be的过去式用were）”，而主句中的谓语动词用“would（should, could, might）+动词原形。”例如：
If I were you, I should studay English。
If he had time, he would attend the meeting。
表示与过去的事实相反的假设...全部
语法教学材料:虚拟语气
虚拟语气表示说话人的愿望、假设、猜测或建议，而不表示客观存在的事实。虚拟语气通过谓语动词的特殊形式来表示，下面对虚拟语气在各种句式中的用法分别介绍。
虚拟语气用于条件状语从句。
表示与现在事实相反的假设时，条件状语从句中的谓语动词用“过去式（be的过去式用were）”，而主句中的谓语动词用“would（should, could, might）+动词原形。”例如：
If I were you, I should studay English。
If he had time, he would attend the meeting。
表示与过去的事实相反的假设时，条件状语从句的谓语动词用“had +过去分词”，主句中的谓语动词用“would（should, could, might）+have +过去分词”。
例如：
If you had taken my advice, you wouldn’t have failed in the examination。
表示与将来事实相反的假设时，条件从句和主句所用的谓语动词怀“表示与现在事实相反的假设”的谓语动词相同，或者条件从句中用“were to（should）+动词原形”。
例如：
If you come tomorrow, we would have the meeting。
If it were to rain tomorrow, the meeting would be put off。
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来调整。例如：
If you had worked hard, you would be very tired。
(从句说的是过去,主句指的是现在。)
5。以上句型可以转换成下列形式:
1)省略if,用“were, have, should +主语”。 例如:
Were I in school again, I would work harder。
Had you been here earlier, you would have seen him。
Should there be a meeting tomorrow, I would come。
但在虚拟条件状语从句中,省略连词的倒装形式的句首不能用动词的缩略形式,如我们可以说:
Were it not for the expense, I would go to Italy。
但不能说
Weren’t it for the expense, I would go to Italy。
2)用介词短语代替条件状语从句。例如:
Without air, there would be on living things。
But for your help, I couldn’t have done it。
3)用其了方式表示。例如:
It would produce had results to do that。
= If you have done that, it would produce bad results。
(二)虚拟语气用于宾语从句
“wish +宾语从句”表示不能实现的愿望,汉语可译为“可惜……”。 “……就好了”, “悔不该……”, “但愿……”等。
表示现在不能实现的愿望,从句的谓语动词用过去式;表示将来不能实现的愿望用“would(could) +动词原形”;表示过去不能实现的愿望时用“had +过去分词”或“(could)would +have +过去分词”。
例如:
I wish it were spring all the year round。
I wish you could go with us。
We wish we had arrived there two hours earlier。
虚拟语气在动词arrange, command, demand, desire, insist, order, propose, request, require, suggest,等后面的宾主从句中用“(should)+动词原形”。
例如:
We suggested that we (should) have a meeting。
We insisted that they (should) go with us。
The doctor ordered that she (should) stay in bed for a few days。
He demanded that we (should) start right away。
注意:insist作“力言”, “强调”解时,宾语从句不用虚拟语气,只有当insist作 “坚持(认为)”, “坚持(应该)”解时宾语从句才用虚拟语气。
例如:
Mike insisted that he had never stolen anything。
(三)虚拟语气用于表语从句、同位语从句
作advice, idea, order, demand, plan, proposal, suggestion, request等名词的表语从句和同位语从句,其谓语动词要用虚拟语气的结构“(should)+动词原形”。
例如:
We all agreed to his suggestion that we (should) go to Beijing for
sightseeing。
My idea is that we (should) exercises first．
(四)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的应用．
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，则用过去时，指将来则用过去将来时．例如：
He looked as if he were an artist。
He speaks English so fluently as if he had studied English in England．
Even if he were here，he could not solve the problem．
(五)虚拟语气用于主语从句．
在主语从句中，谓语动词的虚拟语气结构用“ should 十动词原形”的结构，表示惊奇、不相信、惋惜、理应如此等．例如：
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．
在上述三种主语从句中，should意为“应该”,“竟然”，可以省去，但不可换用would。
主句所用动词的时态不限．
注意：这种从句表示的是事实．如果说话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从句也可用陈述语气，例如：
It is a strange that he did not come yesterday。
It is a pity that you can’t swim．
(六)虚拟语气用于定语从句
这种从句常用在 It is( high) time( that)…句型中，定语从句的谓语动词用过去式，或 should十动词原形( should不能省略，be用 were)来表示，意为“(现在)该……”。
例如：
It is ( high) time we left (should leave)。
lt is high time we were going。
(七)虚拟语气用于 if only引导的感叹句中
If only I had taken his advice。
我要是听他的话就好了．
If only I were a bird．我如果是一只鸟就好了．
(八)虚拟语气在简单句中的应用
l)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，例如：
It would be better for you not to stay up too late．
Would you be kind enough to open the door?
2)用于一些习惯表达法中，例如：
Would you like a cup of tea?
I would rather not tell you。
You had better go now． 3)用“ may 十动词原形”表示“祝愿”、“但愿”． may须置于句首，例如：May you be happy! May you succeed!
虚拟语气是一种动词形式，表示说话人的一种愿望，假设，怀疑，猜测， 建议等含义，虚拟语气所表示的含义不是客观存在的事实。
If I were you, I'd take them away。
如果我是你的话，我就会带走他们。
If I had met Li Hua, I could had told him。
如果我碰见了李华，我就告诉了他了。
If I had time。 I could come to help you。
如果我有时间，我会来帮助你的。
He suggested that our class should be divided into five groups。
他建议说我们的班应该分成五个小组。
He speaks to us as if he had been there。
他给我们讲的好象他去过那儿。
虚拟语气的用法
1) 虚拟语气用在简单句中，表示祝愿，命令。
May you be happy。
祝你幸福。
May you have a good time。
祝愿你玩的痛快。
May the friendship between us last long。
祝愿我们的友情天长地久。
Have a good journey!
祝愿你旅途愉快！
You go out！
你出去！
2) 虚拟语气用在宾语从句中。
动词 wish, suggest,order,insist, propose,等词后面的宾语从句表示的是一种虚拟语气， 宾语从句中的动词动作表示的只是一种愿望，要求。
I wish she would be on my side。
我希望她能站在我一边。
I wish I could help him。
我希望我能帮助他。
He insisted that all of us should be there on time by any means。
他坚持要我们大家想尽办法按时去那儿。
动词 demand, suggest, order, insist, propose 后面的从句中，"should" 可以省略。
The teacher suggested that we (should) clean the blackboard after class。
老师建议我们课后把黑板擦了。
He ordered that the students wash the clothes every week by themselves。
他要求学生每周都要自己洗衣服。
3) 虚拟语气用在主语从句中。
在句型 "It is important (necessary, strange, natural) that 。
。。。 " 中，that 后面的从句中的谓语动词用： should + 动词原形
It's necessary that we should have a walk now。
我们有必要出去散散步。
It's natural that she should do so。
她这样做是很自然的。
It's important that we should take good care of the patient。
重要的是我们要照顾好病人。
4) 虚拟语气用在状语从句中。
虚拟语气最多地用在表示条件的状语从句和表示结果的主句中。
在表示与事实相反的虚拟语气时，动词有三种时态形式，即现在，过去和将来。
与现在事实相反的：
条件从句 结果从句
If I (we,you,he,they)+ 动词过去式。
。 if I (he,she) were。。。 I (we) should + 动词原形。 He (you,they) would + 动词原形。
与过去事实相反的：
条件从句 结果从句
If I(we,you,he,they)+ had + 过去分词 I(we)should + have+ 过去分词。
He (you,they) would + have + 过去分词。
If I were you, I should buy it。
如果我是你，我就买了它。
If I had time, I would study French。
如果我有时间，我会学习法语的。
If she knew English,she would not ask me for help。
如果她懂英语的话，她不会找我帮忙的。
If you had got up earlier, you could have caught the train。
如果你早一点起床，就会赶上火车的。
If it were fine tomorrow,I would go shopping。
如果明天天气好，我就去买东西。
有关虚拟语气的几个问题：
1) 有时if引导的状语从句可以省略 if，而把从句中的动词 were, had 或 should 移到主语前面。
Were she younger, she would do it 。
如果她年青点， 她就会干的。
Had he known her address, he would had gone to visite her。
如果他知道她的地址，他会去看她的。
2) 有时表示虚拟语气的条件从句或者主句都可以省略，而只剩下一个主句或者一个条件从句。
I could help you。
我本来可以帮助你。
If I had time。
我要有时间该多好啊。
She should have come to the party。
她应该来参加聚会。
If he had much more money。
如果他有更多的钱就能。。
。。
3) 虚拟语气中，条件从句的动词动作可以和主句的动词动作时态不一致。
If they had studied hard, they could do it easily now。
如果他们以前努力学习的话，现在干的就会容易些。
If he had not taken my advice, he wouldn't do it much better like this。
如果他不听取我的建议，他就不会干得这样好。
虚拟语气
back
一、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。
二、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。
三、“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。
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。
三、would rather ＋从句
在这种结构中，从句的位于动词用过去形式表示虚拟。
I would rather you did this instead of me
四 宾语从句中的虚拟语气
advise, direct, agree, ask, demand, decide, desire, insist, order, prefer, propose, request, suggest 后的从句
其从句谓语的动词应用：should＋原形动词
。
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