in time ,on

in time:
及时
例句与用法:
1.The car came to a halt just in time to prevent an accident.
汽车及时停下,避免了一场车祸.
2.Can we get to the station in time?
我们能及时到达车站吗?
on time:
准时
例句与用法:
1.To our astonishment,they arrived on time.
使我们惊讶的是,他们准时到了.
2.He will come on time even though it rains.
即使下雨,他还是会准时来的.