They spend no time together
Yet they're relatively linked
These three birds of a feather
Who march through time in sync

Present is right now
Past is just before it
Future rightly vows
Nothing will detour it

The past flies by too fast
It's movement so incessant
And with a final gasp
Bestows on us the present

The past is understood
When at present we look back
Most memories are good
But some do sadly lack

For the time that's yet to be
The future, as it's known
Let's prepare it present-ly
With good memories all it's own

Stanley Cooper

http://www.poemhunter.com/poem/past-present-future-2/