［虛擬語氣］It is （high） time that

It is （high） time that 后面的從句謂語動詞要用過去式或用should加動詞原形，但should不可省略。例如：
    It is time that the children went to bed. 孩子們該睡覺了。
    It is high time that the children should go to bed.