( Gases ( ( ( ( are ( often invisible ) ) and ) ( assume ( ( the ( ( shape and ) volume ) ) ( of ( their container ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Gases)) (VP (VP (VBP are) (ADJP (RB often) (JJ invisible))) (CC and) (VP (VBP assume) (NP (NP (DT the) (NN shape) (CC and) (NN volume)) (PP (IN of) (NP (PRP$ their) (NN container)))))) (. .)))
Gases are often invisible and assume the shape and 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))))) (. .)))