16.8 It is (high) time that

     It is (high) time that 后面的從句謂語(yǔ)動(dòng)詞要用過(guò)去式或用should加動(dòng)詞原形，但should不可省略。
     It is time that the children went to bed.
     It is high time that the children should go to bed.