 What do we need the truth-functional truth conditions for? Do they explain the meaning of compounds of conditionals? According to Jackson, they do not (1987, p. 129). We know what “\(A \supset B\)” means, as a constituent in complex sentences. But “\(A \supset B\)” does not mean the same as “If \(A, B\)”. The latter has a special assertability condition. And his theory has no implications about what, if anything, “if \(A, B\)” means when it occurs, unasserted, as a constituent in a longer sentence.