The main problem for most forms of non-cognitivism is that moral judgments look and behave like propositions—that is, in this connection, the kinds of things that can be true or false. They have, as the jargon has it, a “propositional surface”. We claim that such sentences are true or false, we speak of knowing the difference between good and bad, right and wrong (where knowledge would appear to entail truth), we wonder whether our ethical opinions are right or wrong (in the sense of correct or