So sorry, I'm so dreadfully late.

I apologize for keeping the book two days overdue.

We have some money indeed, but we are very sorry that we cannot return the money now, as we have to consider our overheads.

Sorry to keep you waiting, ladies and gentlemen. We can seat your party now. This way, please.

"As to that, " said the janitor, "I am sorry to hurt your feelings, but what you're saying is news to me.