He was ready to strike at the head of the snake.
( He ( ( was ( ready ( to ( strike ( at ( ( the head ) ( of ( the snake ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD was) (ADJP (JJ ready) (S (VP (TO to) (VP (VB strike) (PP (IN at) (NP (NP (DT the) (NN head)) (PP (IN of) (NP (DT the) (NN snake)))))))))) (. .)))
The snake had a head.
( ( The snake ) ( ( had ( a head ) ) . ) )
(ROOT (S (NP (DT The) (NN snake)) (VP (VBD had) (NP (DT a) (NN head))) (. .)))