( But ( ( only ( ( H ( in ( ( the ( hot core ) ) ( of ( the Sun ) ) ) ) ) ( ( can ` ) burn ) ) ) ( , ( ' ( ( ( say ( the innermost ) ) ( ( 10 % ) ( giving ( ( a lifetime ) ( of ( ( about ( 7 billion ) ) years ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (CC But) (SBAR (RB only) (S (NP (NP (NNP H)) (PP (IN in) (NP (NP (DT the) (JJ hot) (NN core)) (PP (IN of) (NP (DT the) (NNP Sun)))))) (VP (MD can) (`` `) (VP (VB burn))))) (, ,) ('' ') (VP (VBP say) (NP (DT the) (NN innermost))) (NP (NP (CD 10) (NN %)) (VP (VBG giving) (NP (NP (DT a) (NN lifetime)) (PP (IN of) (NP (QP (RB about) (CD 7) (CD billion)) (NNS years)))))) (. .)))
But only H in the hot core of the Sun can 'burn,' say the innermost 10% giving a lifetime of about 7 billion years.
(ROOT (S (NP (DT The) (DT the) (NN core)) (VP (VBZ is) (NP (NP (DT the) (JJ innermost) (NN layer)) (PP (IN of) (NP (DT the) (NN sun))))) (. .)))