Z. claims that in order to judge whether a sentence (with 'say', 'tell', etc.) is an adequate report of another sentence, one needs a distinction between meaning (i.e. what is asserted, asked, etc.), presuppositions (i.e. the conditions on the correct use of the sentence), message (i.e. what might be conveyed by the sentence even though it may be unrelated to its meaning), and inferences (which can be deduced from sentences).