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Tense and Implict Role Reference

This paper describes preliminary work relating tense to implicit role reference. Past work has shown that tense affects the resolution of other reference types such as pronouns as well as discourse structure (Webber, 1988; Hwang and Schubert, 1992). We extend this claim to the reference of implicit roles. We annotated a small corpus for NPs and VPs and tense information and show, in some cases, that one can improve resolution rates of implicit roles by using simple heuristics incorporating tense with focusing. To our knowledge, this is the first time that an automated corpus study has been done analyzing the effects of temporal information in reference.