yeah i can believe that
( yeah ( i ( can ( believe that ) ) ) )
(ROOT (S (VP (VB yeah) (SBAR (S (NP (FW i)) (VP (MD can) (VP (VB believe) (NP (DT that)))))))))
I will never believe in what you just said.
( I ( ( ( will never ) ( believe ( in ( what ( you ( just said ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (MD will) (ADVP (RB never)) (VP (VB believe) (PP (IN in) (SBAR (WHNP (WP what)) (S (NP (PRP you)) (ADVP (RB just)) (VP (VBD said))))))) (. .)))