( ( ( ( ( Liquids ( have ( a ( definite volume ) ) ) ) , ) but ) ( they ( ( do not ) ( have ( a ( definite shape ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNS Liquids)) (VP (VBP have) (NP (DT a) (JJ definite) (NN volume)))) (, ,) (CC but) (S (NP (PRP they)) (VP (VBP do) (RB not) (VP (VB have) (NP (DT a) (JJ definite) (NN shape))))) (. .)))
Liquids have a definite volume, but they do not have a definite shape.
(ROOT (S (NP (NN Liquid)) (VP (VBZ has) (NP (NP (DT a) (JJ definite) (NN volume)) (, ,) (CONJP (CC but) (RB not)) (NP (DT a) (JJ definite) (NN shape)))) (. .)))