I am sorry.

Sorry for the mess.

Sorry I interrupted you.

Sorry I am late.

I'm sorry for your loss.

Sorry, I did it by mistake.

Sorry, I don't remember your name.

Sorry to have kept you waiting.

I am sorry to disturb you.

I am sorry for being late.

Sorry, I have kept you waiting.

I am sorry for your loss.

I am sorry, I acted without thinking.

Sorry, I didn't mean to cause any trouble.

I am sorry to hear you are in trouble.