The impact that the Ghost of Christmas Past had on Scrooge is that when he took Scrooge back to a time that really sad, he started to get emotional. He loved his fiance, Belle. When she left, it was a really hard time for Scrooge, so he got to experience that sad moment again.
The impact that the Ghost of Christmas Present had on Scrooge is that he takes Scrooge through London to the place where the Crachit family is preparing a mini feast. The kindness warms his heart, but the day goes by and the ghost ages really quickly. There are starving children and it is hard to watch.
The impact that the Ghost of Christmas Yet to Come, or the Ghost of Christmas Future, had on Scrooge is that when the ghost took Scrooge to the grave, Scrooge kept begging to know who died. The ghost never said anything, so Scrooge kept asking. When Scrooge realized that it was his name on the gravestone, he was terrified. He was desperate to get his point across to the ghost, he said he was going to change. There was nobody at his funeral either, so he was trying to tell the ghost that he was going to change. The ghost slowly started to disappear, and then Scrooge got back to London and was now in the spirit for Christmas.