英语虚拟语气有点乱,请达人给我的思绪整理一下老是还没复习到虚拟语气,所以都好乱1.would should could might+V原/had done2.were3.should do4.倒退一个时态这四种虚拟语气各用于什么情况啊?

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英语虚拟语气有点乱,请达人给我的思绪整理一下
老是还没复习到虚拟语气,所以都好乱
1.would should could might+V原/had done
2.were
3.should do
4.倒退一个时态
这四种虚拟语气各用于什么情况啊?

从句\x05 主句
与现在事实相反\x05If+主语+did(be动词were),\x05主语+should/would/could/might+do
与过去事实相反\x05If+主语+had done,\x05 主语+should/would/could/might+have done
与将来事实相反\x051.If+主语+did
2.If+主语+were to
3.If+主语+should 主语+should/would/could/might+do