( ( If ( ( ( the temperature ) ( of ( ( the gas ) ( in ( the balloon ) ) ) ) ) ( is ( ( increased ( the ( gas molecules ) ) ) ( in ( the balloon ) ) ) ) ) ) ( ( begin ( to ( move faster ) ) ) . ) )
(ROOT (S (SBAR (IN If) (S (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (NP (DT the) (NN gas)) (PP (IN in) (NP (DT the) (NN balloon)))))) (VP (VBZ is) (VP (VBN increased) (NP (DT the) (NN gas) (NNS molecules)) (PP (IN in) (NP (DT the) (NN balloon))))))) (VP (VBP begin) (S (VP (TO to) (VP (VB move) (ADVP (RBR faster)))))) (. .)))
If the temperature of the gas in the balloon is increased the gas molecules in the balloon begin to move faster.
(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)) (. .)))