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不能省略)。
It's time we started.
(It's time we should start.)