( ( ( All four ) ( of ( my limbs ) ) ) ( ( are involved ) . ) )
(ROOT (S (NP (NP (DT All) (CD four)) (PP (IN of) (NP (PRP$ my) (NNS limbs)))) (VP (VBP are) (ADJP (VBN involved))) (. .)))
All four of my limbs are involved.
(ROOT (S (NP (DT All) (NNS mammals)) (VP (VBP have) (NP (CD four) (NNS limbs))) (. .)))