( Laura ( ( ( changes ( ( the ( negative result ) ) ( of ( the test ) ) ) ) ( to ( a ( positive one ) ) ) ) . ) )
(ROOT (S (NP (NNP Laura)) (VP (VBZ changes) (NP (NP (DT the) (JJ negative) (NN result)) (PP (IN of) (NP (DT the) (NN test)))) (PP (TO to) (NP (DT a) (JJ positive) (NN one)))) (. .)))
Laura changes the negative result of the test to a positive one.
(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))))))))))) (. .)))