( ( In ( ( these substances ) ( -LRB- ( insulators -RRB- ) ) ) ) ( ( the electrons ) ( ( are ( tightly ( bound ( to ( the nuclei ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (NP (DT these) (NNS substances)) (PRN (-LRB- -LRB-) (NP (NNS insulators)) (-RRB- -RRB-)))) (NP (DT the) (NNS electrons)) (VP (VBP are) (ADJP (RB tightly) (VBN bound) (PP (TO to) (NP (DT the) (NN nuclei))))) (. .)))
In these substances (insulators) the electrons are tightly bound to the nuclei.
(ROOT (S (NP (NNP Rubber)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT a) (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-) (NNS insulators)) (SBAR (WHNP (WDT that)) (S (VP (VBZ does) (RB not) (VP (VB allow) (S (NP (NNS electrons)) (VP (TO to) (VP (VB move) (PP (IN through) (NP (PRP them)))))))))))))) (. .)))