a negligible work of manipulation , an exploitation piece doing its usual worst to guilt-trip parents 
(ROOT (NP (NP (NP (DT a) (JJ negligible) (NN work)) (PP (IN of) (NP (NN manipulation)))) (, ,) (NP (NP (DT an) (NN exploitation) (NN piece)) (VP (VBG doing) (NP (PRP$ its) (JJ usual) (JJS worst)) (S (VP (IN to) (VP (NN guilt) (HYPH -) (NN trip) (NP (NNS parents)))))))))
(ROOT (NP (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NN )))) (, ) (NP (NP (DT ) (NN ) (NN )) (VP (VBG ) (NP (PRP$ ) (JJ ) (JJS )) (S (VP (IN ) (VP (NN ) (HYPH ) (NN ) (NP (NNS )))))))))