Nothing. There was a boy singing a Christmas carol at my door last night. I should like to have given him something. That's all.
Come in! Come in and know me better man! I am the Ghost of Christmas Present, Look upon me!
It's humbug still! I won't believe it.
Scrooge sees himself sitting alone and regrets not giving anything to the boy caroling outside his door. The theme is shown in this scene when Scrooge realizes that the way people treat you when you're a kid can affect you as an adult.
Leave me! Take me back! Haunt me no longer!
The way the Ghost of Christmas Present acts towards Scrooge indicates that he is a friendly ghost.
Ghost of the Future! I fear you more than any specter I have seen.
Scrooge thinks he hears chain noises and becomes frustrated since the noises he is hearing are disturbing him. This is an internal conflict because what he is actually hearing is not a real thing.
I wear the chain I forged in life. I made it link by link, and yard by yard...
Scrooge is holding the Ghost of Christmas Past's cap. The cap is suppose to extinguish the ghost, but when Scrooge steals it and tries to extinguish the ghost himself he can't. This symbolizes that you can't escape your past.
The Ghost of Christmas Future doesn't have to say anything to come off as creepy and mysterious. This shows indirect characterization because the author gives him no personality and leaves the reader to conclude that he is creepy.
Marley's chain symbolizes all the times he has sinned. All of his sins stuck with him after his life and the chains are his punishment.