 Consideration of Lewis’s argument from temporary intrinsics has shown that a three-dimensionalist should probably endorse the tensed conception of semantics, in order to account for changing truths about the world and its objects. And once we have seen this, it also becomes clear that A-theorists, presentists, and proponents of the growing block theory all have similar reasons for adopting the tensed conception of semantics. For the A-theorist is committed to there being changing truths about which times and events are future, which are present, and which are past; and presentists and growing block theorists are both committed to there being changing truths about what exists.