( Electrons ( ( have ( a ( negative charge ) ) ) . ) )
(ROOT (S (NP (NNS Electrons)) (VP (VBP have) (NP (DT a) (JJ negative) (NN charge))) (. .)))
Electrons have a negative charge.
(ROOT (S (S (NP (JJ Remember) (NNS electrons)) (VP (VBP are) (ADVP (RB negatively)) (VP (VBN charged)))) (, ,) (IN so) (S (NP (NP (NNS ions)) (PP (IN with) (NP (DT a) (JJ positive) (NN charge)))) (VP (VBP have) (VP (VBN lost) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN electron))))) (. .)))