For this to work, the sense in which moral sentences express the attitudes which determine their semantic values must be fairly strict and particular.  For in one sense perfectly ordinary indicative sentences can express non-cognitive attitudes as when, ‘It is ten o’clock already,’ can express impatience.  And, ‘Lying sucks!’ and ‘I disapprove of lying,’ can each express disapproval of lying.  Even so, we should not want to assimilate the semantics of these sentences to one another.  Thus expressivists of the narrower sort must identify a kind of expression which allows them to distinguish the way in which “Lying is wrong,” expresses the attitude that generates its semantic value, from the way in which “I disapprove of lying,” or even “I think that lying is wrong” might express the very same attitude (Schroeder 2008a, 2008c).