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I'm sorry.
,
I am sorry.
,
I apologise.
,
I apologize.
I'm sorry I'm late, but I got stuck in a traffic jam.
I'm sorry. I didn't want to offend you.
I apologize for keeping you waiting so long in the cold.
On behalf of my family, I apologize for the damage.
I apologize for the intrusion but I have to speak with the boss.