How Do You Say You Are Very Sorry?

How Do You Say You Are Very Sorry? I’m sorry. phrase. … I/we regret to inform/tell you that. phrase. … my (humble/deepest/sincere etc) apologies. phrase. … I beg your pardon. phrase. … excuse me. phrase. … regrettably. adverb. … forgive me (for doing something)/forgive my doing something. phrase. … I’m afraid. phrase. How do you