First, how can I say sorry. How to say... is incorrect. The usage for sorry about --> I am sorry about something e.g. the accident (but I had nothing to do with it) sorry for --> I am sorry for a person (e.g. I am sorry for her. She must have been very sad since her boyfriend left her.) OR I am sorry for having caused the accident (i.e. having done something wrong or bad) More formal: I (sincerely) apologize for...(e.g. being late).