uld be
(past present and future), as well as what is/has been. This is done using a
"possible worlds" approach, or more properly possible universes, in which
spatio-temporal parts can be shared between different possible universes. So
my life up to today can be part of any possible future I might have. 

GH&gt;	For analytical purposes, I would also suggest there is usefulness in
"could have been" situations, where it is postulated a difference occurred
at one or more past points in space-time. 

A consequen