TAILIEUCHUNG - Báo cáo khoa học: "A Discourse Copying Algorithm for Ellipsis and Anaphora Resolution"

We give an analysis of ellipsis resolution in terms of a straightforward discourse copying algorithm that correctly predicts a wide range of phenomena. The treatment does not suffer from problems inherent in identity-of-relations analyses. Furthermore, in contrast to the approach of Dalrymple et al. [1991], the treatment directly encodes the intuitive distinction between full NPs and the referential elements that corefer with them through what we term role linking. | A Discourse Copying Algorithm for Ellipsis and Anaphora Resolution Andrew Kehler Harvard University Aiken Computation Laboratory 33 Oxford Street Cambridge MA 02138 kehler@ Abstract We give an analysis of ellipsis resolution in terms of a straightforward discourse copying algorithm that correctly predicts a wide range of phenomena. The treatment does not suffer from problems inherent in identity-of-relations analyses. Furthermore in contrast to the approach of Dalrymple et al. 1991 the treatment directly encodes the intuitive distinction between full NPs and the referential elements that corefer with them through what we term role linking. The correct predictions for several problematic examples of ellipsis naturally result. Finally the analysis extends directly to other discourse copying phenomena. 1 Introduction A simple example of verb phrase VP ellipsis is given in sentence 1 1 John likes his mother and Bill does too. The stranded auxiliary in the second clause indicates the deletion of a verb phrase the meaning of which is to be determined from another clause in this case the first clause. Following Dalrymple et al. 1991 we term the clause that the VP is copied from the source clause and the clause which contains the elided VP the target clause. As is well established in the literature referential elements1 in the source clause VP may give rise to strict sloppy ambiguities 1 For present purposes we will use the term referential elements as synonymous with pronouns. In Section 5 we discuss how this class may be extended to include implicit arguments as well. in the target clause for example in sentence 1 the target clause may receive one of two readings namely one in which Bill likes John s mother the strict reading and one in which Bill likes his own mother the sloppy reading . In this paper we address the distribution of strict and sloppy readings in VP-ellipsis and other anaphoric phenomena. In Section 2 we discuss problems with past .

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