on后面跟具体时间。例如：This year's event will take place on June 19th，a week earlier than usual（今年的活动将于6月19日举行，比往年提前一周）。

on的例句：The light was on and the door was open（灯亮着，门也敞开着）；Claire and Beryl were on the organizing committee（克莱尔和贝丽尔是组委会成员）。