it 'll probably be in video stores by christmas , 
(ROOT (S (NP (PRP it)) (VP (MD 'll) (ADVP (RB probably)) (VP (VB be) (PP (IN in) (NP (NN video) (NNS stores))) (PP (IN by) (NP (NNP christmas))))) (, ,)))
(ROOT (S (NP (PRP )) (VP (MD ) (ADVP (RB )) (VP (VB ) (PP (IN ) (NP (NN ) (NNS ))) (PP (IN ) (NP (NNP ))))) (, )))