  Perdurantists maintain that a persisting object is a sum of momentary temporal parts. An object persists through an interval of time by having numerically distinct temporal parts existing at each moment in that interval. An object undergoes a change in its qualities across time by having numerically distinct temporal parts with contrary qualities. A close cousin of perdurantism is the stage view, defended in Hawley 2001 and Sider 1996, 1997, 2000, and 2001, according to which the subject of temporal predication is a momentary temporal part. Whereas perdurantists claim that a name like ‘Bush’ designates a sum of temporal parts, stage theorists maintain that it designates a momentary object. A past tense predication like ‘x was sitting’ is true of that momentary stage s, assuming this a case of the simple past tense, just in case there is an earlier temporal part that bears the counterpart relation to s that satisfies the condition ‘x is sitting’ (and similarly for future tense predications). If singular propositions are the contents of those sentences, then it is natural to claim that different propositions, with different temporal parts as constituents, are expressed by utterances of the sentence ‘Bush is sitting’ at different times. There are, then, two distinct propositions corresponding to (10). 