if 引导的从句较多,个人以为一般状语从句较简单,而虚拟语气比较复杂,所以简单写了点虚拟语气用法.if 虚拟用法1、对将来虚拟if +did/were to /should , .would/could /might +do 其中 were to 和should 可以倒装 ...