formal: I apologize for the delay in replying, Please accept my apologies for, I apologize for the inconvenience, I hope you will be able to forgive me., I hope you understand., I can see now it would have been better to, I understand completely, There's no need to apologize, informal: Sorry for not getting in touch sooner, Apologies for, Sorry for, Sorry for the trouble this causes, I can understand that you, It's perfectly all right, That's OK,

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