Scrooge heard the sound of his nephew, Fred's hearty laugh.
Marley tells Scrooge to expect three more spirits to visit him that night.
Three ghosts
Merely explains that without their council Scrooge may expect the same fate as he was suffering - everlasting torment.
This refers to the Ghost of Christmas Yet to Come . Scrooge is unaware of whom the people in the scenes refer to but is starting to guess it might me him and wants the ghost to tell him so
Scrooge tells Bob to have the day off if he really must but be in all the earlier the very next day
Scrooge had no more family following Fans death
I am Christmas past.
Marley appeared to Scrooge and warned him about changing his behavior. Marley also told Scrooge he would be visited by three ghosts.
When Marley's ghost visited Scrooge he warned him about the ghosts and his behaviour.
This was Marley telling Scrooge that he (Marley) was allowed to come back to Scrooge to tell Scrooge of his inpending eternal life of torment should he not make changes to the way he lives his life now and sees mankind as his business not just the money he can get from them
He states its "Christmas day"
Marley appeared in the fist instance and warned Scrooge that his miserly life style and attitude to others would see him suffer eternal torment in the next life and that he (Marley) had been allowed back to this life just once to warning and help him