( Thus ( , ( ( for example ) ( , ( ( when ( wood burns ) ) ( , ( ( ( each atom ) ( of ( the ( element carbon ) ) ) ) ( ( ( ( ( combines ( with ( ( two atoms ) ( of ( the ( element oxygen ) ) ) ) ) ) ( to ( form ( ( one molecule ) ( of ( the ( compound ( carbon dioxide ) ) ) ) ) ) ) ) , ) ( ( releasing energy ) ( in ( the process ) ) ) ) . ) ) ) ) ) ) ) )
(ROOT (S (ADVP (RB Thus)) (, ,) (PP (IN for) (NP (NN example))) (, ,) (SBAR (WHADVP (WRB when)) (S (NP (NN wood)) (VP (VBZ burns)))) (, ,) (NP (NP (DT each) (NN atom)) (PP (IN of) (NP (DT the) (NN element) (NN carbon)))) (VP (VBZ combines) (PP (IN with) (NP (NP (CD two) (NNS atoms)) (PP (IN of) (NP (DT the) (NN element) (NN oxygen))))) (S (VP (TO to) (VP (VB form) (NP (NP (CD one) (NN molecule)) (PP (IN of) (NP (DT the) (JJ compound) (NN carbon) (NN dioxide))))))) (, ,) (S (VP (VBG releasing) (NP (NN energy)) (PP (IN in) (NP (DT the) (NN process)))))) (. .)))
Thus, for example, when wood burns, each atom of the element carbon combines with two atoms of the element oxygen to form one molecule of the compound carbon dioxide, releasing energy in the process.
(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))))))) (. .)))