( Gas ( ( is ( ( ( a form ) ( of matter ) ) ( that ( ( does not ) ( have ( ( ( a ( definite volume ) ) or ) shape ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Gas)) (VP (VBZ is) (NP (NP (DT a) (NN form)) (PP (IN of) (NP (NN matter))) (SBAR (WHNP (WDT that)) (S (VP (VBZ does) (RB not) (VP (VB have) (NP (NP (DT a) (JJ definite) (NN volume)) (CC or) (NP (NN shape))))))))) (. .)))
Gas is a form of matter that does not have a definite volume or shape.
(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)))) (. .)))