“Every event belongs to both [of A and B] series, and yet theseries have quite different characteristics. Events in the Aseries are constantly changing their positions…In contrast, anevent’s position in the B series never changes…Three viewsare possible regarding the A and B series: the A series isfundamental to time [(A theory)]; the B series is fundamental[(B theory)]; neither series is fundamental…A defender of thethird view thinks that the debate has been misconceived:there are two languages of time but only one time series,which can be described in different ways.”