I will take a hint from Dungeon World that has worked for me.
##Address the characters, not the players
Address the characters, not the players
Well, not really. In DW you're just supposed to call the players with the name of their characters, and this improves immersion. Here, just ask what "your character" does. It is almost impossible to answer "Jozan rolls Medicine". Assuming this isn't a gonzo game, characters don't roll dice. Characters do things.
If they insist on telling you what they do, you might add "no, no, no. I asked what does (s)he do, not you".
Hopefully, they will embrace the paradigm more easily.