COMO PEDIR PERDON Y RESPONDER EN INGLES/ APOLOGIES AND RESPONSES TO APOLOGIES

APOLOGIES
 Excuse me. (In British English 'Excuse me' is used for interrupting, sneezing, pushing in front of somebody...)
(I beg your) pardon. ( In BrE it is used for mishaps such a s treading on someone's toe)
(I'm) sorry.
I'm extremely sorry (about that letter)/ ( for forgetting to send that letter)
Will you forgive/ excuse me if i have to live early?
I hope you will forgive/excuse me if I have to leave early.

RESPONSES TO APOLOGIES
That's all right.
Please, don't worry.