Sorry, I misunderstood you.对不起, 我误会你了。

He had misunderstood the rules.他误解了规则。

I obviously misunderstood, and I apologize.很明显我是误会了, 我道歉。

I'm not saying what he did was good, don't misunderstand me.我不是说他做得对, 别误解我的意思。