She was a very good mistress to me, sir.
( She ( ( ( ( was ( ( a ( ( very good ) mistress ) ) ( to me ) ) ) , ) sir ) . ) )
(ROOT (S (NP (PRP She)) (VP (VBD was) (NP (NP (DT a) (ADJP (RB very) (JJ good)) (NN mistress)) (PP (TO to) (NP (PRP me)))) (, ,) (ADVP (RB sir))) (. .)))
She was a bad mistress. 
( She ( ( was ( a ( bad mistress ) ) ) . ) )
(ROOT (S (NP (PRP She)) (VP (VBD was) (NP (DT a) (JJ bad) (NN mistress))) (. .)))