( ( ( The ( Massive Extinction ) ) ( of ( Modern ( Times ( Massive extinctions ) ) ) ) ) ( ( ( ( have ( ( ( ( ( occurred ( five times ) ) ( during ( ( the ( earth 's ) ) history ) ) ) -- ) ( most notably ) ) ( ( ( about ( 65 million ) ) years ) ago ) ) ) , ) ( when ( ( ( ( about 15 ) percent ) ( of ( living species ) ) ) ( , ( ( including ( the dinosaurs ) ) ( , ( died out ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (NP (DT The) (JJ Massive) (NN Extinction)) (PP (IN of) (NP (NNP Modern) (NNP Times) (JJ Massive) (NNS extinctions)))) (VP (VBP have) (VP (VBN occurred) (NP (CD five) (NNS times)) (PP (IN during) (NP (NP (DT the) (NN earth) (POS 's)) (NN history))) (: --) (ADVP (RBS most) (RB notably)) (ADVP (NP (QP (RB about) (CD 65) (CD million)) (NNS years)) (RB ago))) (, ,) (SBAR (WHADVP (WRB when)) (S (NP (NP (QP (RB about) (CD 15)) (NN percent)) (PP (IN of) (NP (VBG living) (NNS species)))) (, ,) (PP (VBG including) (NP (DT the) (NNS dinosaurs))) (, ,) (VP (VBD died) (PRT (RP out)))))) (: ;)))
The Massive Extinction of Modern Times Massive extinctions have occurred five times during the earth's history -- most notably about 65 million years ago, when about 15 percent of living species, including the dinosaurs, died out;
(ROOT (S (NP (EX There)) (VP (VBP have) (VP (VBN been) (NP (CD five) (JJ major) (JJ massive) (NNS extinctions)) (SBAR (IN since) (S (NP (NN life)) (VP (VBD began) (PP (IN on) (NP (NN earth)))))))) (. .)))