The two main characters Johnsy and Sue are together in the room because Johnsy has taken on the sickness of pneumonia.
Sue is very upset with Johnsy situation with pneumonia. So she is laying down thinking what to do.
There is only 1 leaf left on the tree now and Johnsy fears she will die soon but she is also relieved that she might die. So Behrman has a plan to help.
The Element of Plot Enhances the Element of Conflict.
Johnsy is upset laying in bed all day just waiting for her demise because she is really depressed in life being in her current situation.
The neighbor Old Berham is painting the tree that Johnsy thinks represents her life and when the last leaf falls she will die aswell, so Behrman is painting a fake one so that Johnsy will believe there is hope for life in the morning when she wakes up.
The Element of P.O.V (Omniscient) Enhances the Element of Plot