( gases ( ( assume ( ( ( both ( the shape ) ) and ) ( ( the volume ) ( of ( their container ) ) ) ) ) . ) )
(ROOT (S (NP (NNS gases)) (VP (VBP assume) (NP (NP (PDT both) (DT the) (NN shape)) (CC and) (NP (NP (DT the) (NN volume)) (PP (IN of) (NP (PRP$ their) (NN container)))))) (. .)))
gases assume both the shape and the volume of their container.
(ROOT (S (NP (DT A) (NN gas)) (VP (VBZ assumes) (NP (NP (DT the) (NN shape)) (PP (IN of) (NP (PRP$ its) (NN container))))) (. .)))