( ( a gas ) ( ( ( ( has ( ( ( neither ( a ( definite shape ) ) ) nor ) ( a ( definite volume ) ) ) ) but ) ( expands ( to ( fill ( ( any container ) ( ( in which ) ( it ( is placed ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT a) (NN gas)) (VP (VP (VBZ has) (NP (NP (ADVP (DT neither)) (DT a) (JJ definite) (NN shape)) (CC nor) (NP (DT a) (JJ definite) (NN volume)))) (CC but) (VP (VBZ expands) (S (VP (TO to) (VP (VB fill) (NP (NP (DT any) (NN container)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (PRP it)) (VP (VBZ is) (ADJP (VBN placed))))))))))) (. .)))
a gas has neither a definite shape nor a definite volume but expands to fill any container in which it is placed.
(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)))) (. .)))