Could you please explain to me the difference between "I'm sorry for ..." and "I am sorry to (+ verb) ..."?
Are all the sentences below correct? If not, why not?
I am sorry to reply late.
I am sorry for replying late.
I am sorry for the late reply.
I am sorry for being late in my reply.
I am sorry that I am replying late.
I am sorry to bother you.
I am sorry for bothering you. => I have never heard it but is it possible? What is the difference?