英语：这里为什么用realized 不用realize 呢

题目

英语：这里为什么用realized 不用realize 呢
Parents would be greatly surprised and deeply touched if they( realized) how much belief their children usually have in their character and infallibility 假设为什么就用realized 了呢

答案

if的虚拟语气,与现在相对,可以使用过去式.If I were you,I would not do that.如果我是你,我不会那样做的.If I were a bird,I could fly in the sky.(假设而已,因为你不能是鸟的）If you knew that,you could do bet...