( ( What ( works ( for ( one child ) ) ) ) ( ( ( might not ) ( work ( for another ) ) ) . ) )
(ROOT (S (SBAR (WHNP (WP What)) (S (VP (VBZ works) (PP (IN for) (NP (CD one) (NN child)))))) (VP (MD might) (RB not) (VP (VB work) (PP (IN for) (NP (DT another))))) (. .)))
What works for one child might not work for 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)))) (. .)))