( have ( a ( net ( negative charge ) ) ) )
(ROOT (S (VP (VB have) (NP (DT a) (JJ net) (JJ negative) (NN charge)))))
have a net negative charge
(ROOT (S (NP (JJ Iconic) (NNS compounds)) (VP (VBP have) (NP (DT a) (JJ net) (JJ neutral) (NN charge))) (. .)))