( ( Things ( that ( work ( on ( one machine ) ) ) ) ) ( ( ( might not ) ( work ( on another ) ) ) . ) )
(ROOT (S (NP (NP (NNS Things)) (SBAR (WHNP (WDT that)) (S (VP (VBP work) (PP (IN on) (NP (CD one) (NN machine))))))) (VP (MD might) (RB not) (VP (VB work) (PP (IN on) (NP (DT another))))) (. .)))
Things that work on one machine might not work on another.
(ROOT (S (S (VP (TO To) (VP (VB confirm) (NP (NP (DT the) (NN work)) (PP (IN of) (NP (DT another) (NN scientist))))))) (, ,) (NP (DT a) (NN scientist)) (VP (MD might) (VP (VB replicate) (NP (PRP$ their) (NN work)))) (. .)))