( ( ( Increase volume ) ( by ( fifth ( of ( maximum amount ) ) ) ) ) . )
(ROOT (S (VP (VB Increase) (NP (NN volume)) (PP (IN by) (NP (NP (JJ fifth)) (PP (IN of) (NP (JJ maximum) (NN amount)))))) (. .)))
Increase volume by fifth of maximum amount.
(ROOT (S (PP (IN From) (NP (NP (NNS observations)) (ADJP (RB as) (JJ simple) (PP (IN as) (S (VP (VBG blowing) (PRT (RP up)) (NP (DT a) (NN balloon)))))))) (, ,) (NP (PRP it)) (VP (VBZ is) (ADJP (JJ clear)) (SBAR (IN that) (S (S (VP (VBG increasing) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN gas)))))) (VP (VBZ increases) (NP (DT the) (NN volume)))))) (. .)))