( There ( ( have ( been ( ( five ( previous ( Great Extinctions ) ) ) ( in ( ( Earth 's ) history ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP have) (VP (VBN been) (NP (NP (CD five) (JJ previous) (NNP Great) (NNPS Extinctions)) (PP (IN in) (NP (NP (NNP Earth) (POS 's)) (NN history)))))) (. .)))
There have been five previous Great Extinctions in Earth's history.
(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)))))))) (. .)))