 The objection that Taylor himself suggests is the Aristotelian one: we reject presupposition 1 (and also, presupposition 6, since we embrace the idea that a proposition may fail to be either true or false at one time and come to be true or false later, as a result of the mere passage of time). We would also, presumably, need to amend presupposition 5, so that it was not the lack of a necessary condition for an act which was problematical, but the existence of a condition which was sufficient for the non-performance of the act.