event 指的是重大的、引起兴趣的或不寻常的事件、大事，特别是历史事件。

Next day the newspapers reported the event. 第二天, 报纸报道了这个事件。

accident 指意想不到的不幸事故。

Four people were killed in a road accident. 四个人在一次道路交通事故中死亡。

incident 指不太重要的小事件。多指伴随大事件而来的小事或突发事件。

Incident often brings out character. 小事情往往显露品质。

The demonstration passed without incident. 游行示威很顺利，中间没出什么乱子。

occurrence指的是日常的偶发事件。

an everyday occurrence每天发生的事

练习：

A  1. As the result of the _____, the diplomatic ties between the two countries were severed.

    A. incident     B. accident     C. event      D. occurrence

A  2. The boy told me about some ____ on his first day at school, few of which I could believe.

    A. incidents    B. accidents   C. events    D. matters