it's high time we were going.这里的were going 可以可以换成 went和should go

it's high time we were going.这里的were going 可以可以换成 went和should go

可以的,都表示将来.
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习惯用：It's high time sb. did sth. 虚拟语气的用法。

可以。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。