These three marks of intentionality apply only to noncompound sentences. A compound sentence counts as intentional if and only if one of its components is intentional. Thus, ‘if Parsifal sought the Holy Grail, then he was a Christian’ is intentional because its antecedent is intentional. The antecedent carries the first mark of intentionality because neither it nor its negation entails either that the Holy Grail exists or that it does not exist.