The Ghost of Christmas Past takes Scrooge and shows him his childhood days around Christmas and his apprenticeship with a jolly name "Fezziwig" and his engagement to "Belle".
The Ghost of Christmas Present show this to scrooge and this is what happens- "Scrooge discovers Bob Cratchit's son, Tiny Tim, a courageous boy whose kindness humility warms Scrooge's heart."
The Ghost of Christmas Yet to Come does this to him- "Scrooge finds himself in a churchyard, the spirit pointing to the grave. Scrooge looks at the headstone and is shocked to read his own name." He desperately wants to turn around his fate and he wakes up in his bed and turns his bad Christmas spirit and turns it into the best Christmas spirit in the world.