虚拟语气句型“it is (high)time that”中的is变成was
请问：
1.虚拟语气的句型“it is (high)time that”和“it was (high)time that”在句子表达的意思上有什么不同?请区别性举例,
2.这个“it was (high)time that”句型的从句谓语可以是过去式或should+动词原形吗?可以的请写出例句.
如果“should+动词原形”可以,那么它是说明现在还是将来?请写出例句.