It is time 后的定語從句用虛擬語氣
從句謂語通常用過去式表示現(xiàn)在或?qū)?，有時也用過去進(jìn)行時或“should+動詞原形”(較少見，且should不能省略)，其意為“(早)該干某事了”。如：
I think it's time you went to bed. 我想你該睡覺了。
It's time we went [were going, should go]. 我們該走了。
I think it's time they were taught a lesson. 我想現(xiàn)在該給他們一點教訓(xùn)了。
注：time前有時有about和high修飾：
I think it's high time that she made up her mind. 我想她該拿定主意了。
與其他的虛擬結(jié)構(gòu)不同，該結(jié)構(gòu)不能在該用 was 時而用 were。如：
It's time I was in bed. 我該上床睡了。(不用were)
