I don't think that it's time you worked hard at English

问题描述:

I don't think that it's time you worked hard at English
为什么用worked hard用过去式

因为在 It is (high) time + 从句 这个句型中,从句中要用虚拟语气,动词形式就是【动词过去式】
如:it is time we went to bed