Student or Learner
Is the following question correct?
"What is the unfinished business you have with Kevin about?"
It's OK but I wouldn't bother with "about" at the end. "What's the unfinished business you have with Kevin?" would elicit the answer you're looking for (or it would elicit "It's none of your business"!)
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.