( There ( ( are ( ( two ( major types ) ) ( of ( seismic waves ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD two) (JJ major) (NNS types)) (PP (IN of) (NP (JJ seismic) (NNS waves))))) (. .)))
There are two major types of seismic waves.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD two) (NNS types)) (PP (IN of) (NP (NN surface) (NNS waves))))) (. .)))