now that's a good idea
( now ( that ( 's ( a ( good idea ) ) ) ) )
(ROOT (FRAG (ADVP (RB now)) (SBAR (WHNP (WDT that)) (S (VP (VBZ 's) (NP (DT a) (JJ good) (NN idea)))))))
That's a really bad idea.
( That ( ( 's ( a ( ( really bad ) idea ) ) ) . ) )
(ROOT (S (NP (DT That)) (VP (VBZ 's) (NP (DT a) (ADJP (RB really) (JJ bad)) (NN idea))) (. .)))