  Since Aristotle regards tense as part of the truth-bearer (as opposed to merely a grammatical feature), he detects a problem regarding future tense sentences about contingent matters: Does the principle that of an affirmation and its negation one must be false, the other true, apply to these? What, for example, is the truth-value now of the sentence ‘There will be a sea-battle tomorrow’? Aristotle may have suggested that the sentence has no truth-value now, and that bivalence thus does not hold—despite the fact that it is necessary for there either to be or not to be a sea-battle tomorrow, so that the principle of excluded middle is preserved (Int. 9).