Sorry about that. 抱歉。
Oooops! sorry about that.
噢！抱歉！

Accident. 意外。
I apologise. It was an accident.
抱歉，这是个意外。

I didn't mean it. 我不是故意的。
Don't be upset; I didn't mean it!
别难过！我不是故意的！

On purpose 故意
I didn't do it on purpose.
我不是故意的。

It was not my intention. 我不是故意的。
It was not my intention to lead you on.
我不是故意误导你的。

I didn't do it deliberately. 我不是故意的。
I wasn't trying to hurt you deliberately.
我不是故意要伤害你的。

Excuse me. 不好意思。
Please excuse my behaviour last night. I wasn't feeling well.
请原谅我昨晚的行为。我昨天不太舒服。

Pardon me. 不好意思。
Pardon me, I didn't see you there.
不好意思。我没看到你在那里。