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虛擬語(yǔ)氣：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.