It is high time that .后面加过去式 还是should加原型?

It is high time that .后面加过去式 还是should加原型?
It is high time that .后面加过去式 还是should加原型?

It is high time that .后面加过去式 还是should加原型?
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.
It is high time that the children went to school.
It is high time that the children should go to school.

过去式

should加原型