( ( ( ( ( ( ( ( An increase ) ( in pressure ) ) , ) ( ( a decrease ) ( in temperature ) ) ) , ) and ) ( ( a decrease ) ( in ( ( the number ) ( of ( moles ( of gas ) ) ) ) ) ) ) ( ( ( could all ) ( ( cause ( a decrease ) ) ( in ( volume ( of ( a gas ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT An) (NN increase)) (PP (IN in) (NP (NN pressure)))) (, ,) (NP (NP (DT a) (NN decrease)) (PP (IN in) (NP (NN temperature)))) (, ,) (CC and) (NP (NP (DT a) (NN decrease)) (PP (IN in) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS moles)) (PP (IN of) (NP (NN gas))))))))) (VP (MD could) (RB all) (VP (VB cause) (NP (DT a) (NN decrease)) (PP (IN in) (NP (NP (NN volume)) (PP (IN of) (NP (DT a) (NN gas))))))) (. .)))
An increase in pressure, a decrease in temperature, and a decrease in the number of moles of gas could all cause a decrease in volume of a gas.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (PRP you)) (VP (VBP add) (NP (NP (NNS moles)) (PP (IN of) (NP (NP (NN gas)) (PP (TO to) (NP (DT a) (NN baloon)))))) (PP (IN by) (S (VP (VBG blowing) (NP (PRP it)) (PRT (RP up)))))))) (, ,) (NP (DT the) (NN volume)) (VP (VBZ increases)) (. .)))