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
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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
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