What happens to the user’s role upon subscription expiry?

Hello

Just like the title says. I would like to know what happens to the user’s role upon subscription expiry. Since users are give a role during their registration, I would like that role be revoked from the users after they let their subscription expire. Is this possible, and can we give different roles a different downgraded role, like Premium Role 1 gets downgraded to Normal Role 1 and Premium Role 2 gets downgraded to Normal Role 2?

Thank you