Thanks in advance
I felt sorry for the number of beggers I saw when I visited India.
I have learnt to say 'sorry to disturb' someone.
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Sounds like you are about to disturb somebody (ask them a question for example). Maybe it could be a polite way to say excuse me.
2, Sorry for disturbing you...
Sounds like you are apologizing for something you have done (playing your music too loudly).
People are waiting to help.