It's time that we collected our reports.为什么用过去式?如题

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It's time that we collected our reports.为什么用过去式?如题

It's time that we collected our reports.为什么用过去式?如题
It's time that we collected our reports.为什么用过去式?
如题

It's time that we collected our reports.为什么用过去式?如题
虚拟语气.该是干什么事的时候了,但这件事现在还没有干,所以是与现实相反的情况,用虚拟语气.即It's time that +过去时句子.
It's time that...中,that从句中的谓语动词用过去时或用"should+动词原形"(should不能略).
例如:
It's time we started.
(It's time we should start.)

这个是虚拟句的一种,固定用法,记住就可以了。
It is time(about time, high time)that ...(过去式动词形式或should+动词原形)....
It is high time I went home now. = It is high time I should go home now.
表语从句、同位语从句中的虚拟语气

虚拟语气 时态退后一步