  Where does the argument go wrong? The ancients went in for criticizing (I) and (II), and one may indeed wonder whether (I) covers cases of the kind to which it has been applied above. But there are also a couple of things questionable with (V) and (VI). With a certain continuum theory of time, it turns out that (VI) does not hold for those — few — cases in which the proposition at issue has started to be false only at the present moment (Denyer 1981, 43 and 45). More importantly, (V) and its variants seem to smuggle in a deterministic assumption. On one or another of these grounds, then, one may attempt to hold the Master Argument unsound, and so to reject Diodorus' own account of the possible as what either is or will be true.