( ( In ( ( the case ) ( of ( carbon dioxide ) ) ) ) ( , ( ( ( two atoms ) ( of oxygen ) ) ( ( combine ( with ( ( one atom ) ( of carbon ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (DT the) (NN case)) (PP (IN of) (NP (NN carbon) (NN dioxide))))) (, ,) (NP (NP (CD two) (NNS atoms)) (PP (IN of) (NP (NN oxygen)))) (VP (VBP combine) (PP (IN with) (NP (NP (CD one) (NN atom)) (PP (IN of) (NP (NN carbon)))))) (. .)))
In the case of carbon dioxide, two atoms of oxygen combine with one atom of carbon.
(ROOT (S (NP (NNP Carbon) (NN dioxide) (NNS molecules)) (VP (VBP consist) (PP (IN of) (NP (NP (DT a) (JJ central) (NN carbon) (NN atom)) (VP (VBN bonded) (PP (TO to) (NP (CD two) (NN oxygen) (NNS atoms))))))) (. .)))