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))))) (. .)))
There is a bomb on the plane.
( There ( ( is ( ( a bomb ) ( on ( the plane ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ is) (NP (NP (DT a) (NN bomb)) (PP (IN on) (NP (DT the) (NN plane))))) (. .)))