虚拟语气跟条件状语怎么区别...分别什么时候用...是不是在一定时候能互换..

虚拟语气中什么时候才用WOULD而什么时候不用？~

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您好：
可以从2个角度去区分：
1。时态
A，由if引导的条件状语从句通常都是主句为一般将来时，从句为一般现在时。
B，而在虚拟语气中，时态都是有很多，往往都是根据句子的含义判断，究竟是与现在，过去还是将来的事实相反。
2。真实与非真实
A，由if引导的条件状语从句一般都是真实的，只要所谓的条件成立，一定会成为事实
B，但虚拟语气并非如此，if， 既然是虚拟，就一定是非真实的，可以根据句意判断其是否真实
就不举例了，希望您能够明白

虚拟语气分三种情况来掌握：
1、虚拟条件句。
2、名词性虚拟语气。
3、虚拟语气的其他用语。
一、虚拟条件句：
条件状语从句是非真实情况，在这种情况下要用虚拟语气。
1、条件从句与现在事实不一致，其句型为：
If 主语＋过去时，主语＋should(could, would, 或might)＋动词原形，如：
If I were you, I would study hard.
If it rained, I would not be here now.
2、条件从句与过去事实不一致，句型为：
If 主语＋had＋过去分词，主语＋should(could, would, 或might)＋have＋过去分词，如：
If the doctor had come last night, the boy would have saved.
If I had not studied hard, I would have failed in the exam last term.
3、条件从句与将来事实不一致，句型为：
If 主语+should(were to, 过去时)＋do，主语＋should(could...)＋原形do，如：
If it should rain tomorrow, we would stay at home.
If I were to go to the moon one day, I could see it with my own eyes.
If you missed the film to night, you would feel sorry.
注意问题：
1、If条件句中绝对不可出现"would"。
2、根据句中的时间状语，有时可能出现“混合虚拟”的情况，即主句可能是现在的情况，条件句也许是发生在过去的情况，但都是遵守上述句型。
3、在条件句中如果出现were, had, should可省去if，将主语与这些词倒装，例如：
Had the doctor come last night, the boy would have saved.
Were I to go to the moon one day, I would see it with my own eyes.
Should it rain tomorrow, we would stay at home.
二、名词性虚拟语气：
在表示命令、建议要求、惊叹时的名词性从句中需用虚拟语气，基本句型：主语＋(should)＋动词原形，如：Mother insisted that John go to bed at 9 o'clock.（宾语从句）
We suggested that the meeting should not be held.
It was required that the crops should be harvested at once.（主语从句）
The suggestion that he be invited was rejected.（同位语从句）
That is their demand that their wages be increased.（表语从句）
注意：在这种句子中绝不出现"would""must""could"等。
三、虚拟语气在一些特殊词中的使用或含蓄条件句：
1、wish后的宾语从句：
与现在愿望不一致——主语＋过去时：I wish I were you.
与过去愿望不一致——主语＋had＋过去分词：I wish I had visited the white House when I was in the states.
与未来愿望不一致——主语＋would(could)＋原形：I wish I could meet you tomorrow at the party.
2、It's time句型：
当It's time后用that从句时应该为“主语＋should＋原形”或“主语＋过去时”，例如：
It's time that you went to school. 或It's time that you should go to school.
3、If only引起的感叹句相当于“How I wish＋宾语从句”：
If only he could come! 他要能来就好了。
If only I had known the answer! 我要早知答案就好了。
4、would rather, as if(though)引导的句子也需使用虚拟，表示过去的情况用过去完成时，表示现在与将来的情况用过去时，如：
I'd rather you posted the letter right away.
I'd rather you had returned the book yesterday.
She loves the children as if they were hers.
Alan talked about Rome as if he had been there.
5、without, but, but for, otherwise引起的短语或句子常暗含着含蓄条件：
Without you, I would never know him.
But for your cooperation, we wouldn't have done the work so well. = If it were not for your cooperation, we wouldn't have done the work so well.
（注：without / but for... = If it was not for.../ If it hadn't been for...）
But that she was afraid, she would have said no.
I would be most glad to help you, but I' am busy now.
I am busy now; otherwise I would do you the favor!
虚拟条件句的倒装
　　虚拟条件句的从句部分如果含有were, should, 或had, 可将if省略，再把were, should或had 移到从句句首，实行倒装。　 Were they here now, they could help us.　=If they were here now, they could help us.　 Had you come earlier, you would have met him　=If you had come earlier, you would have met him.　　 Should it rain, the crops would be saved.　=Were it to rain, the crops would be saved.注意：　 在虚拟语气的从句中，动词'be'的过去时态一律用"were"，不用was， 即在从句中be用were代替。　 If I were you, I would go to look for him.　　 如果我是你，就会去找他。　 If he were here, everything would be all right. 　　 如果他在这儿，一切都会好的。
还不明白把邮箱发过来，把具体问题写清楚，我把相关知识打包给你，这不是一下就能说清楚的

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