讲一下it's time that这个句型

It's time + that clause 时，that可省略，time可由about修饰，从句中的谓语动词有两种形式，或者用动词的过去式(be用were)；或者用shoud + 动词原形（should不能省略)。此句型为虚拟语气句型，表示“现在某人该做某事了”。含有该事早该去做而未做，现在去做似乎都为时已晚的意思。例：
It's time （that）we went to bed.
我们该去睡觉了。
It's high time that the article were published.
发表这篇文章是适时的。
It's time you should do cleaning.
你该去打扫卫生了。

It is (high) time that 要用虚拟语气，后面的从句谓语动词要用过去式或用should加动词原形，但should不可省略。