( Oil ( ( is ( ( the ( ( most ( widely used ) ) source ) ) ( of ( energy ( ( ( ( in ( developed countries ) ) , ) and ) ( in ( developing ( countries ( is ( ( the ( second most ) ) ( widely ( ( ( used ( source ( of energy ) ) ) -LRB- ) ( after biomass-esp ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Oil)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (RB widely) (VBN used)) (NN source)) (PP (IN of) (NP (NP (NN energy)) (PP (PP (IN in) (NP (JJ developed) (NNS countries))) (, ,) (CC and) (PP (IN in) (S (VP (VBG developing) (SBAR (S (NP (NNS countries)) (VP (VBZ is) (NP (NP (DT the) (JJ second) (JJS most)) (VP (ADVP (RB widely)) (VBN used) (NP (NP (NN source)) (PP (IN of) (NP (NN energy)))) (-LRB- -LRB-) (PP (IN after) (NP (NN biomass-esp)))))))))))))))) (. .)))
Oil is the most widely used source of energy in developed countries, and in developing countries is the second most widely used source of energy (after biomass-esp.
(ROOT (S (NP (NNP Oil)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (RB commonly) (VBN used)) (NN source)) (PP (IN of) (NP (NP (NN energy)) (PP (IN in) (NP (DT the) (NN world))))))) (. .)))