虚拟语气句型“it is (high)time that”中的is变成was

Question

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，谢谢。

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。

Answer 1

虚拟语气中常用过去表示现在，过去的完成时表过去，其实语法没那么多讲究，只是人们习惯用语罢了，你只要明白他要表达的意思就OK了，在与外国人交流时 他们并不注重这些，语言只是沟通，你现在学的这些在实用中没多大意义，除了应付考试。
It is high time that 后固定跟过去式，表示“现在是时候做XX了。”Eg：It is high time we began to work.我们该开始工作了。同时也有 It is high time to do sth.这时句子就简单了。

而 在It was high time that句型后，同样是跟过去式，表示“在XX时候该做XX”一般会有个时间状语或能表明时间的成分在句中表示“XX时候”Eg:Peter's suit was old and it was high time he bought a new one.
看，此句中前面个分句中的WAS 明确表示了时间是在过去，所以此时后面也要跟WAS而非IS。 再举个例子，It was high time he called his wife then.句中的then 也突出了那时，而非现在。

可以跟should+动词原形，具体表什么，根据语境判断。
GOOD LUCK ~O(∩_∩)O~

Answer 2

1.it is high time+ 主语+shuold do 或者 did 形式谓语动词。例如
it is high time you worked hard at your homework.
it is high time you should work hard at your homework.(should不可省略）翻译：你（现在）真该努力写作业了。
2 it was high time + 虚拟句子结构相同。但成翻译--那时某人真该做某事。

Answer 3

1.is-表现在时was-表过去时eg:It's time he went home/It was time he went home yesterday.2.可以.如果过去式与should do同时出现，要以过去时为主3.即表将来又表现在