从句谓语通常用过去式表示现在或将来，有时也用过去进行时或“should+动词原形”(较少见，且should不能省略)，其意为“(早)该干某事了”。如：
I think it's time you went to bed. 我想你该睡觉了。
It's time we went [were going, should go]. 我们该走了。
I think it's time they were taught a lesson. 我想现在该给他们一点教训了。
注：time前有时有about和high修饰：
I think it's high time that she made up her mind. 我想她该拿定主意了。
与其他的虚拟结构不同，该结构不能在该用 was 时而用 were。如：
It's time I was in bed. 我该上床睡了。(不用were)
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