but i think that's probably a good idea
( but ( i ( think ( that ( ( 's probably ) ( a ( good idea ) ) ) ) ) ) )
(ROOT (S (CC but) (NP (FW i)) (VP (VBP think) (SBAR (IN that) (S (VP (VBZ 's) (ADVP (RB probably)) (NP (DT a) (JJ good) (NN idea))))))))
That's definitely a terrible idea.
( That ( ( ( 's definitely ) ( a ( terrible idea ) ) ) . ) )
(ROOT (S (NP (DT That)) (VP (VBZ 's) (ADVP (RB definitely)) (NP (DT a) (JJ terrible) (NN idea))) (. .)))