Nope. I think the issue being my sentence was complete. Perhaps I should have corrected it by saying something like:Those are all dependent clauses; none stands on its own. If you want them to stand on their own, they must be written as, "He was focusing...", "She was focusing..." and "You are focusing..." or "You're focusing...".
Just accept the correction already.
'I was referring to your focusing on'
Or maybe 'I was referring to you're focusing on' would make better grammatical sense to you?