( ( A gas ) ( ( ( does not ) ( have ( ( ( a ( definite shape ) ) nor ) ( a ( definite size ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN gas)) (VP (VBZ does) (RB not) (VP (VB have) (NP (NP (DT a) (JJ definite) (NN shape)) (CC nor) (NP (DT a) (JJ definite) (NN size))))) (. .)))
A gas does not have a definite shape nor a definite size.
(ROOT (S (NP (NP (DT The) (NN gas) (NN form)) (PP (IN of) (NP (NN matter)))) (VP (VBZ has) (NP (NP (ADVP (DT neither)) (DT a) (JJ definite) (NN shape)) (CC nor) (NP (DT a) (JJ definite) (NN volume)))) (. .)))