( ( That is ) ( , ( ( it ( might ( work ( ( ( ( on ( one lake ) ) and ) not ) ( on another ) ) ) ) ) . ) ) )
(ROOT (S (INTJ (DT That) (VBZ is)) (, ,) (S (NP (PRP it)) (VP (MD might) (VP (VB work) (PP (PP (IN on) (NP (CD one) (NN lake))) (CC and) (RB not) (PP (IN on) (NP (DT another))))))) (. .)))
That is, it might work on one lake and not 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)))) (. .)))