The correct version is: "Those who can, do. Those who can't, work for the government." Or have you forgotten these are all gov't employed teachers; and do you

The correct version is: "Those who can, do. Those who can't, work for the government." Or have you forgotten these are all gov't employed teachers; and do you think most private teachers are this incompetent (private school teachers are an in between case, how bad they are depends partly on state requirements).