 A-theorists, on the other hand, believe that at least some important forms of change require classifying events as past, present or future. And accurately describing this kind of change requires some tensed propositions—there is a way reality is (now, presently) which is complete but was different in the past and also will be different in the future. These tensed propositions also explain why we tend to attribute significance to the past-present-future distinction. For example, you might think the A-theorist is in a better position to explain why we care whether a horrible event is already in the past versus still in the future. Some A-theorists will argue that we aren’t concerned with location—we care that the event is over with in reality.