Looking on the internet deeply has found these results:

i am sorry for not clear on BC is the most popular phrase on the web.

i am sorry for not being clear on BC 11,210,000 results on the web	i am sorry for not clear on BC 11,330,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
I am sorry for any shame that I may have brought this department. This discrepancy, the blame for which lies entirely with the report's author for not being clear and precise, is at the root of my unease with the text and why I find it politically impossible to vote for it. I am sorry for your loss, but my staff is me. Tell this man I am sorry for his hardship. Mr Staes, I am sorry for having left some of your questions out. I am sorry for many things that are occurring in this kingdom. I am sorry for making a fuss... I am sorry for the reasons to which you alluded, President.	I am sorry for many things that are occurring in this kingdom. I am sorry for any shame that I may have brought this department. I am sorry for your loss, but my staff is me. I am sorry for making a fuss... Mr Staes, I am sorry for having left some of your questions out. Tell this man I am sorry for his hardship. Look, I am sorry for all the calls. I am sorry for the reasons to which you alluded, President.

i am sorry for not being clear on BC

11,210,000 results on the web

i am sorry for not clear on BC

11,330,000 results on the web

More popular!

I am sorry for any shame that I may have brought this department.
This discrepancy, the blame for which lies entirely with the report's author for not being clear and precise, is at the root of my unease with the text and why I find it politically impossible to vote for it.
I am sorry for your loss, but my staff is me.
Tell this man I am sorry for his hardship.
Mr Staes, I am sorry for having left some of your questions out.
I am sorry for many things that are occurring in this kingdom.
I am sorry for making a fuss...
I am sorry for the reasons to which you alluded, President.