( ( Appointment ( to ( the position ) ) ) ( ( is ( contingent ( upon ( a ( negative ( test result ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Appointment)) (PP (TO to) (NP (DT the) (NN position)))) (VP (VBZ is) (ADJP (JJ contingent) (PP (IN upon) (NP (DT a) (JJ negative) (NN test) (NN result))))) (. .)))
Appointment to the position is contingent upon a negative test result.
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (NP (DT an) (JJ incorrect) (NN test) (NN result)) (SBAR (WHNP (WDT that)) (S (VP (MD should) (VP (VB have) (VP (VBN been) (ADJP (JJ positive) (NP (NP (DT a) (-LRB- -LRB-) (NN n) (-RRB- -RRB-)) (ADJP (JJ false) (JJ negative))))))))))) (. .)))