1.on可以用于具体的时间,如 on July.10th,2008
2.On/before/after +V-ing
如On arriving at the bus stop, he found a lot of people waiting there.
到了车站,他发现又很多人在那里等车。
Before handing in your exercise, you must go it over.
在上交作业之前,你必须复习。
After reading the book, I understood the theory better.
在读了这本书之后,我能更好地理解原理了。
3.on在这里可以和upon互换,可以理解为as soon as, the moment, the instant, no sooner
On arriving home at 2 in the morinng 在早上2点一回到家.......
提问者对于答案的评价:谢谢,您给的最全,也谢谢各位的讲解. :)