( Plants ( ( ( ( ( use ( the ( carbon ( dioxide gas ) ) ) ) ( during photosynthesis ) ) and ) ( ( give out ) ( oxygen gas ) ) ) . ) )
(ROOT (S (NP (NNS Plants)) (VP (VP (VBP use) (NP (DT the) (NN carbon) (NN dioxide) (NN gas)) (PP (IN during) (NP (NN photosynthesis)))) (CC and) (VP (VBP give) (PRT (RP out)) (NP (NN oxygen) (NN gas)))) (. .)))
Plants use the carbon dioxide gas during photosynthesis and give out oxygen gas.
(ROOT (S (NP (NN Oxygen) (NN gas)) (VP (VBZ is) (VP (VBN given) (PRT (RP off)) (PP (IN by) (NP (NNS plants))))) (. .)))