If my life were yours and your life was mine
Then who's life would our's be if we both lived them free
If my heart was yours and your heart was mine
Then who's heart would be broken if we both ran out of time
If I gave you my eyes and you gave me your eyes
Then who's future would we be seeing
Because if is to then, then is to the future
The future would be different since you would see the wrong  one