We have a bomb on board.
( We ( ( have ( ( a bomb ) ( on board ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP have) (NP (NP (DT a) (NN bomb)) (PP (IN on) (NP (NN board))))) (. .)))
We do not have a bomb.
( We ( ( ( do not ) ( have ( a bomb ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP do) (RB not) (VP (VB have) (NP (DT a) (NN bomb)))) (. .)))