( ( If ( ( an electron ) ( is added ) ) ) ( ( an anion ) ( ( is formed ) . ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT an) (NN electron)) (VP (VBZ is) (VP (VBN added))))) (NP (DT an) (NN anion)) (VP (VBZ is) (VP (VBN formed))) (. .)))
If an electron is added an anion is formed.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN anion)) (VP (VBZ is) (VP (VBN formed) (SBAR (WHADVP (WRB when)) (S (NP (DT an) (NN element)) (VP (VBZ gains) (NP (QP (CD one) (CC or) (JJR more)) (NNS electrons))))))) (. .)))