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)))))))))) (. .)))
He was not ready to strike.
( He ( ( ( was not ) ( ready ( to strike ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD was) (RB not) (ADJP (JJ ready) (S (VP (TO to) (VP (VB strike)))))) (. .)))