My mind raced as I tried to work out what was happening.
我拼命地轉動腦筋，想要搞清楚發生了什么事兒。
She couldn't believe it was all happening again.
她簡直無法相信整件事又在重演。
I heard a commotion and went to see what was happening.
我聽到一陣喧鬧便去看看發生了什么事情。
There is very little likelihood of that happening.
幾乎沒有發生那種事情的可能。
We hope to prevent anything unpleasant from happening.
我們希望防止任何不愉快的事發生。
I saw what was happening, but I was powerless to help.
我眼看著事情發生，卻無力相助。