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 perfect at her job. 
( She ( ( was ( perfect ( at ( her job ) ) ) ) . ) )
(ROOT (S (NP (PRP She)) (VP (VBD was) (ADJP (JJ perfect) (PP (IN at) (NP (PRP$ her) (NN job))))) (. .)))