在虚拟语气中为什么要用“were”修饰主“I”(请回答理由而不是结果)

Question

在虚拟语气中为什么要用“were”修饰主“I” (请回答理由而不是结果 )

Answer 1

对过去的事情进行虚拟语气.
could/would/should/might + have done +if sb + had done .
对现在事情进行虚拟语气.
could/would/should/might + do + if sb + did/were
对将来事情进行虚拟语气.
could/would/should/might + do + if sb + did/were
could/would/should/might + do + if sb + should do
could/would/should/might + do + if sb + were to .
因为 do + if sb + were to.只是套用公式.
所以也没什么可不可以理解的.就是套用公式就行.
无论是什么主语,遇到虚拟语气后面都要用were修饰就可以了、