She was not able to speak, but appeared to comprehend well.
 Patient has normal speech
(ROOT (S (S (NP (PRP She)) (VP (VBD was) (RB not) (ADJP (JJ able) (S (VP (TO to) (VP (VB speak))))))) (, ,) (CC but) (S (VP (VBD appeared) (S (VP (TO to) (VP (VB comprehend) (ADVP (RB well))))))) (. .)))
(ROOT (S (NP (NN Patient)) (VP (VBZ has) (NP (JJ normal) (NN speech)))))
( ( ( ( ( She ( ( was not ) ( able ( to speak ) ) ) ) , ) but ) ( appeared ( to ( comprehend well ) ) ) ) . )
( Patient ( has ( normal speech ) ) )