To see why dependency relations could be useful for MR classification, consider the sentences in Table 3: (1) (2) In sentences (1) and (2), the PROBLEM concepts His pain and The patient's pain occur as the subject of the verb controlled and the TREATMENT concepts oral medication and Motrin occur as objects of the prepositional with modifier of the same verb controlled.
intuitively, the verb controlled cues that the PROBLEM concept is being controlled, and together with the preposition with it cues that the TREATMENT concept is doing the controlling.