it is high time that有的在后面加（should）+動詞原形,有的在后面加虛擬語氣如It is high time that suc

就兩種用法.
It is (high) time that后面的從句謂語動詞
要么用過去式或者用should+動詞原形,但should不可省略.
如：
It is high time that the children went to school.
It is high time that the children should go to school.lYU影風(fēng)網(wǎng)