Unable to keep fluid down.
 Patient has vomiting
(ROOT (S (S (ADJP (JJ Unable) (S (VP (TO to) (VP (VB keep) (NP (NN fluid)) (PRT (RB down))))))) (. .)))
(ROOT (S (NP (NN Patient)) (VP (VBZ has) (VP (VBG vomiting)))))
( ( Unable ( to ( ( keep fluid ) down ) ) ) . )
( Patient ( has vomiting ) )