( ( The ( groin wall ) ) ( ( is ( sewn shut ) ) . ) )
(ROOT (S (NP (DT The) (NN groin) (NN wall)) (VP (VBZ is) (NP (NP (NN sewn)) (VP (VBN shut)))) (. .)))
The groin wall is sewn shut.
(ROOT (S (NP (NP (DT A) (NN wall)) (PP (IN of) (NP (NP (NNS rocks)) (CC or) (NP (JJ concrete) (DT a))))) (VP (VBD called) (NP (DT a) (NN groin))) (. .)))