He's too cautious.
( He ( ( 's ( too cautious ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBZ 's) (ADJP (RB too) (JJ cautious))) (. .)))
He's not brave enough.
( He ( ( ( 's not ) ( brave enough ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBZ 's) (RB not) (ADJP (JJ brave) (RB enough))) (. .)))