关于英语中的虚拟语气虚拟语气有很多种情况,比如说：与现在事实相反,与过去事实相反,与将来事实相反,还有在条件句中,还有I

关于英语中的虚拟语气
虚拟语气有很多种情况,比如说：与现在事实相反,与过去事实相反,与将来事实相反,还有在条件句中,还有It's time to……,还有用would rather that来连接的.请详细点说各种情况下该用哪种.最好用张简单的表格,

虚拟种类
1.条件虚拟
a）if从句—— 如果、倘若
例如：
 If I were you,I would do it just away.
 If it were not Saturday tomorrow.
b）suppose/supposing——假如
例如：
 Suppose (that) I were you.
 Supposing it were not Saturday tomorrow.
c）in case——万一
 例如：You should bring an umbrella with you,in case it were raining; of cause there’s no rain today.
d）as if —— 似乎,仿佛
 例如：He went upstairs as if he had been drunk,though he has not drunk any liquor.
2.愿望虚拟
A.名词从句
a）提出建议、发出命令、提出请求、表示见解等属于主语的愿望
宾语从句：I suggested that he (should常常省略) leave immediately.
表语从句：My suggestion is that he leave immediately.
主语从句：That he (should) leave immediately is my suggestion
同位语从句：My suggestion,that he leave immediately,has not been adopted.
B.用在it is 句式中提出建议、发出命令、提出请求、表示见解愿望
It is important that he that he (should常常省略) leave immediately.
C.特殊句式
a）Wish从句：He wish that he had been there yesterday.
b）It is time从句：It is high time you had got up to have your meal.
c）Rather从句：I would rather you (should) come tomorrow.
d）Had Better从句：Your mother had better you come tomorrow
谓语动词的时态变化
1.条件从句时态前移
a) 现在——过去
b) 过去——过去完成
c) 将来——三种情况：过去式；were to；should do
例如：
If it were not to be Saturday tomorrow.
(由 It is to be Saturday tomorrow演变而来)
If it were not Saturday tomorrow.
(由It is Saturday tomorrow演变而来)
If it should not be Saturday tomorrow.
(由It will be Saturday tomorrow演变而来)
2.主句
a) 表示现在或将来虚拟——
情态动词（would,should,could,might,ought to) + do
b) 表示对过去虚拟——
情态动词(would,should,could,might,ought to)+ have done.
3.愿望虚拟 （should可省略）+ do