A defense of physical becoming

This paper defends physical becoming against Grünbaum's attack, by constructing three arguments in favor of physical becoming. Of the three, I rely primarily on an argument from the philosophy of language, and especially on the principle that tensed discourse involves presuppositions and commitments that Grünbaum's account of becoming cannot handle. I show that Grünbaum's analysis of becoming can provide only a very implausible reconstruction of the temporal coordination of speakers engaged in discourse.I am grateful to many for comments and criticism, but particularly to an anonymous reviewer for this journal, who found several infelicities and an outright blunder in an earlier draft.