It is time (that)句型中的定语从句里的谓语动词常用虚拟浯气表示将来，动词形式用动词的过去式：意思是该干某件事了，时间已经有些晚了。如：It is time we left.我们该走了。It is time we went to bed.我们该睡觉了：It is time we su..