( Now ( ( ( ( ( assume ( that ( ( the gas ) ( decomposes ( to form ) ) ) ) ) ( ( nitrogen and ) hydrogen ) ) , ) ( ( increasing ( ( the number ) ( of ( gas particles ) ) ) ) ( in ( the container ) ) ) ) . ) )
(ROOT (SINV (ADVP (RB Now)) (VP (VBP assume) (SBAR (IN that) (S (NP (DT the) (NN gas)) (VP (VBZ decomposes) (S (VP (TO to) (VP (VB form)))))))) (NP (NN nitrogen) (CC and) (NN hydrogen)) (, ,) (S (VP (VBG increasing) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NN gas) (NNS particles)))) (PP (IN in) (NP (DT the) (NN container))))) (. .)))
Now assume that the gas decomposes to form nitrogen and hydrogen, increasing the number of gas particles in the 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))))) (. .)))