Mostly, when he's tired or distracted, I hear questions like "Where the cat is?" instead of "Where is the cat?", or "What the clock is?" rather than "What is the time?"

I can see where both of those come from, but 95% of the time he asks questions "properly". I realized recently it has been years since he got a persons gender wrong - that was a hard one for him to learn, as with all Finnish people, but it seems to have finally sunk in.