［虚拟语气］It is （high） time that

　　It is （high） time that 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。例如：

　　It is time that the children went to bed. 孩子们该睡觉了。

　　It is high time that the children should go to bed.