on time的意思是“按时”。也就是是指一个特定的时间，我们要在这个时间做某事。我们经常用这个短语来描述和计划有关的内容。in time的意思是“to have sufficient time”，即“及时”。也就是你要做某事，你有足够多的时间去做这件事。
in time例句
1.It is just a misunderstanding. It will be cleared up in time.
这只是个误会，总有一天事情会澄清的。
2.This was anyway just a timing issue; the development would have led to higher revenues in time.
无论如何，这只是个时间问题，项目开发迟早会使收入增加。
3.I don’t like to argue with you any more. In time, you will know that you are in the wrong.
我不想再跟你争了，今后你会明白是你错了。
4.A lot of our associations seem like friendship at first, only to break down and disappear in time.
许多关系开始看起来都像友谊,但随着时间的过去,这些关系逐渐会破裂消失。
5.It'no use persuade him at the Psent time, but in time he will come to accept the harsh reality.
现在你劝说他没有用的，不过他会慢慢接受这个残酷现实的。
on time例句
1.You must get to the station on time.
你必须准时赶到车站。
2.The boss ordered that the work should be done on time.
老板吩咐工作必须按时完成。
3.The rain kept us from getting there on time.
那场雨使我们不能准时到达那里。
4.We can depend on his arriving here on time.
我们可以相信他会准时到来。
5.To our astonishment, they arrived on time.
使我们惊讶的是，他们准时到了。
