on time的意思是“按時”。也就是是指一個特定的時間，我們要在這個時間做某事。我們經常用這個短語來描述和計劃有關的內容。in time的意思是“to have sufficient time”，即“及時”。也就是你要做某事，你有足夠多的時間去做這件事。

in time例句

1.It is just a misunderstanding. It will be cleared up in time.

這只是個誤會，總有一天事情會澄清的。

2.This was anyway just a timing issue; the development would have led to higher revenues in time.

無論如何，這只是個時間問題，項目開發遲早會使收入增加。

3.I don’t like to argue with you any more. In time, you will know that you are in the wrong.

我不想再跟你爭了，今后你會明白是你錯了。

4.A lot of our associations seem like friendship at first, only to break down and disappear in time.

許多關系開始看起來都像友誼,但隨著時間的過去,這些關系逐漸會破裂消失。

5.It'no use persuade him at the present time, but in time he will come to accept the harsh reality.

現在你勸說他沒有用的，不過他會慢慢接受這個殘酷現實的。

on time例句

1.You must get to the station on time.

你必須準時趕到車站。

2.The boss ordered that the work should be done on time.

老板吩咐工作必須按時完成。

3.The rain kept us from getting there on time.

那場雨使我們不能準時到達那里。

4.We can depend on his arriving here on time.

我們可以相信他會準時到來。

5.To our astonishment, they arrived on time.

使我們驚訝的是，他們準時到了。