Full Idea
The presentist must deny the truth of everyday claims that concern multiple times taken together.
Gist of Idea
Presentists must deny truths about multiple times
Source
Theodore Sider (Four Dimensionalism [2001], 2.2)
Book Reference
Sider,Theodore: 'Four Dimensionalism' [OUP 2003], p.25
A Reaction
This rests on the extent to which every truth has an ontological commitment. You can deny the literal existence of multiple times without denying such truths.