regretting

Is there anything you've done in your life that you regret?

你一生中做过什么令你感到懊悔的事情没有？

We did have an invitation, but we had to send Graham our regrets.

我们确实收到了请柬，但是我们脱不开身，不得不向格雷厄姆致歉辞谢。