if引导条件状语虚拟语气的三种用法

如题所述

有三种情况:
(1)对过去,从句had done主句would/could/might/have done
(2)对现在,从句:did /were主句:would/could/might do
(3)对将来,should do/were to do/did.从句,更上一个一样.注意,“主将从现”原则.
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