Can you draft a sentence (with all the words precisely determined) in your mind before you say it or you write it down? Can you "rehearse" saying it without moving your tongue or mouth? If yes, that's pretty much an "inner voice".
Not really, I can speak it out loud though which is often what I do. I have over the years been able to do it in my mind but it’s not really a voice or words but some conceptual framing of the words. It’s difficult to explain.
