1.on purpose 故意地,有意地，为了特定目的
例句：This is especially true here, and it was on purpose.
这一点在这里尤其准确，并且它是故意的。
2.on sale 廉价出售，出售,上帝
例句：Unusually for a video game release, there have been no reviews before it went on sale.
作为一款电玩游戏的发行，出售前居然没有评论，显然很不可思议。
3.on schedule 按时间表，及时,准时
例句：Once the program starts, the producer makes sure it stays on schedule.
一旦节目开播，制作人要确保节目按照预定时间进行。
4.on the contrary 正相反
例句：On the contrary, they protect them and help if there are any difficulties.
相反的，如果他们遇到了什么困难，警察还会保护并帮助他们。
5.on special 以特价出售
例句：I only wear a tie on special occasions.
我只在特殊场合才打领带。
6.on the basis of 在…的基础上，以…为基础
例句：We judge a worker on the basis of his performance.
我们以工作成绩作为评估一个工人的根据。