( ( For example ) ( , ( ( ( the volume ) ( of ( a gas ) ) ) ( ( ( ( decreases ( as ( ( the pressure ) ( of ( the ( gas increases ) ) ) ) ) ) , ) ( for ( a ( constant temperature ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (NP (NP (DT the) (NN volume)) (PP (IN of) (NP (DT a) (NN gas)))) (VP (VBZ decreases) (PP (IN as) (NP (NP (DT the) (NN pressure)) (PP (IN of) (NP (DT the) (NN gas) (NNS increases))))) (, ,) (PP (IN for) (NP (DT a) (JJ constant) (NN temperature)))) (. .)))
For example, the volume of a gas decreases as the pressure of the gas increases, for a constant temperature.
(ROOT (S (S (VP (VP (VBG Decreasing) (NP (NP (DT the) (NN volume)) (PP (IN of) (NP (DT a) (NN gas))))) (CC and) (VP (VBG keeping) (NP (NP (NN everything)) (NP (RB else) (DT the) (JJ same)))))) (VP (MD will) (VP (VB cause) (NP (PRP$ its) (NN pressure) (S (VP (TO to) (VP (VB increase))))))) (. .)))