( ( ( ( Neutrons ( are neutral ) ) -- ) ( they ( have ( ( a charge ) ( of 0 ) ) ) ) ) . )
(ROOT (S (S (NP (NNS Neutrons)) (VP (VBP are) (ADJP (JJ neutral)))) (: --) (S (NP (PRP they)) (VP (VBP have) (NP (NP (DT a) (NN charge)) (PP (IN of) (NP (CD 0)))))) (. .)))
Neutrons are neutral -- they have a charge of 0.
(ROOT (S (NP (DT A) (NN neutron)) (VP (VBZ has) (NP (ADJP (JJ neutral) (CC or) (DT no)) (NN charge))) (. .)))