度々すみません。
何度もごめんなさい
Pardon me for interrupting you.
I really don't know how to apologize to you.
I must apologize.
Excuse me a minute.
Excuse me a moment.
It has been a long time since I wrote you last.
度々すみません。
何度もごめんなさい
I'm sorry to trouble you, but …; Excuse me, but ….
Pardon me for interrupting you.
I must apologize.
I really don't know how to apologize to you.
Excuse me, but...
Excuse me a moment.
うるさくてごめん