A VP group is a stack of VPs covering the same compound verb group, such as Formal definitions are given below: true if VP ∈ path(v, srn) and VP ∈ VP-group directly dominating w f alse otherwise In addition to the minimality conditions, which resolve ambiguity when two predicates compete to govern an argument, we use locality constraints to capture distinct local relationships between a verb and the syntactic position occupied by a candidate argument.
we distinguish between internal arguments occupying a position dominated by a VP node, external arguments occupying a position dominated by an S node, and extracted arguments occupying a position dominated by an SBAR node.