Two of them saw Thorn coming.
( ( Two ( of them ) ) ( ( saw ( Thorn coming ) ) . ) )
(ROOT (S (NP (NP (CD Two)) (PP (IN of) (NP (PRP them)))) (VP (VBD saw) (NP (NNP Thorn) (VBG coming))) (. .)))
Nobody saw Thorn coming.
( Nobody ( ( saw ( Thorn coming ) ) . ) )
(ROOT (S (NP (NN Nobody)) (VP (VBD saw) (NP (NNP Thorn) (VBG coming))) (. .)))