求大神解决虚拟语气的结构于用法

Question

前阵子看书了，学习到虚拟语气，可是书本上的太深奥，我是自学的，求大神总结起来简单说明

Answer 1

虚拟语气要注意 啥时用， 怎么用。

和过去或现在事实相反、对将来推测时用到虚拟语气。

 表示对过去，现在，将来愿望，但又不能实现时  用到虚拟语气  

  3.对现在，过去，将来事实的假设。（一般由as if ，as though等引导)

在第一种情况下，与过去事实相反，主句谓语动词：would have done  ，从句谓语：had done ；                      与现在事实相反，主句谓语：would do 从句谓语：were、 did（过去式）；  表示将来的推测，主句谓语：would do 从句谓语：were to do、should do . 

  第二种， 对过去愿望：从句谓语：had done 、could have done  ；   对现在或将来愿望：从句谓语：could do 、were  

 第三种，对过去事实假设：从句谓语：had done；  对现在事实假设：从句谓语：were、did（过去式）；对将来事实假设：从句谓语：would do 

追问

可否加上例句表示

追答

在第一种情况下，与过去事实相反，主句谓语动词：would have done ，从句谓语：had done ；EX: If he had known it,he would have told me .
与现在事实相反，主句谓语：would do 从句谓语：were、 did（过去式）；

EX: what would you do if you were in his place?
表示将来的推测，主句谓语：would do 从句谓语：were to do、should do .

EX: If she should encounter any difficulty in her life, her sister would help her out.
第二种， 对过去愿望：从句谓语：had done 、could have done ；
EX：I wish i had forgotten it.
对现在或将来愿望：从句谓语：could do 、were
EX: I wish i could fly. / I wish i were a bird.
第三种，对过去事实假设：从句谓语：had done；
EX:The animal was walking as though it has hurt its leg.
对现在事实假设：从句谓语：were、did（过去式）；
EX:She talks as if she were innocent.
对将来事实假设：从句谓语：would do
EX: It seems as if the meeting would never end.
I HOPE IT CAN HELP YOU.

Answer 2

虚拟语气123

1. 什么情况下用: 表达一种愿望或想做但又无法做(到)的事: I wish I were young/If I were there, I would have helped you.
2. 时态: 虚拟语气的时态比较特殊. 在表达愿望时, 通常用wish+could/would/should
3. 在表达想做但又无法做(到)的事时, 虚拟语气也有现在,过去.将来时. 不过, 表示现在的, 用过去时 (If I were you...); 表示过去的, 用could/would/should+have done (I should have finished my college last year); 表示将来的, 用could/would/should+do (I would give you a hand)

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