虚拟语气

主表

类型	时间意义	口诀	结构	例句
真实条件句	表事实或可能	主将从现	If + 一般现在，主句 will + 原形	If it rains, we will stay home.
现在虚拟	与现在事实相反	主过将从一过	If + 过去式，主句 would + 原形	If I were you, I would leave.
过去虚拟	与过去事实相反	主过将完从过完	If + had + 过去分词，主句 would have + 过去分词	If I had known, I would have told you.
将来虚拟	表极不可能将来	主将从 should / were to	If + should/were to + 动词原形，主句 would + 原形	If he should come, I would tell him.
wish 句型	现在愿望	wish 从过	wish + 过去式	I wish I were taller.
wish 句型	过去后悔	wish 从过完	wish + had + 过去分词	I wish I had gone there.

If 速查：

主句	时间意义	从句
将来	事实或可能	一般现在
过去将来	与现在事实相反	一般过去
过去将来完成	与过去事实相反	过去完成
将来	不可能的将来	should / were to

Wish 速查:

时间意义	从句
现在愿望	一般过去
过去后悔	过去完成