on its own , it 's not very interesting . 
(ROOT (S (PP (IN on) (NP (PRP$ its) (JJ own))) (, ,) (NP (PRP it)) (VP (VBZ 's) (RB not) (ADJP (RB very) (JJ interesting))) (. .)))
(ROOT (S (PP (IN ) (NP (PRP$ ) (JJ ))) (, ) (NP (PRP )) (VP (VBZ ) (RB ) (ADJP (RB ) (JJ ))) (. )))