The patient was unable to offer a review of systems.
 Patient has provided a ROS
(ROOT (S (NP (DT The) (NN patient)) (VP (VBD was) (ADJP (JJ unable) (S (VP (TO to) (VP (VB offer) (NP (NP (DT a) (NN review)) (PP (IN of) (NP (NNS systems))))))))) (. .)))
(ROOT (S (NP (NN Patient)) (VP (VBZ has) (VP (VBN provided) (NP (DT a) (NN ROS))))))
( ( The patient ) ( ( was ( unable ( to ( offer ( ( a review ) ( of systems ) ) ) ) ) ) . ) )
( Patient ( has ( provided ( a ROS ) ) ) )