TAILIEUCHUNG - Báo cáo khoa học: "THE IMPERFECTIVE PARADOX AND TRAJECTORY-OF-MOTION EVENTS *"

In particular, the present treatment correctly accounts not only for what (2a) fails to entail - - namely, that John eventually reaches the museum - - but also for what (2a) does in fact entail - - namely, that John follows (by jogging) at least an initial part of a path that leads to the museum. In the second part of the paper, I briefly describe an implemented algorithm based on this theoretical treatment which determines whether a specified sequence of trajectory-of-motion is or is not possible under certain situationally supplied constraints and restrictive assumptions. . | THE IMPERFECTIVE PARADOX AND TRAJECTORY-OF-MOTION EVENTS Michael White Department of Computer and Information Science University of Pennsylvania Philadelphia PA USA Abstract In the first part of the paper I present a new treatment of THE IMPERFECTIVE PARADOX Dowty 1979 for the restricted case of trajectory-of-motion events. This treatment extends and refines those of Moens and Steedman 1988 and Jackendoff 1991 . In the second part I describe an implemented algorithm based on this treatment which determines whether a specified sequence of such events is or is not possible under certain sit-uationally supplied constraints and restrictive assumptions. Introduction Bach 1986 12 summarizes THE IMPERFECTIVE PARADOX Dowty 1979 as follows .how can we characterize the meaning of a progressive sentence like la 17 on the basis of the meaning of a simple sentence like lb 18 when la can be true of a history without lb ever being true la John was crossing the street. lb John crossed the street. Citing parallels in the nominal domain Bach goes on to point out that this puzzle is seemingly much more general insofar as it appears whenever any sort of partitive is employed. In support of this view we may observe that the start v-ing construction exhibits the same behavior 2a John started jogging to the museum. 2b John jogged to the museum. Here we see that 2a does not entail 2b while 2b asserts the occurrence of an entire event of John jogging to the museum 2a only asserts the The author gratefully acknowledges the helpful comments of Mark Steedman Jeff Siskind Christy Doran Matthew Stone and the anonymous referees as well as the support of DARPA N00014-90-J-1863 ARO DAAL03-89-C-0031 NSF IRI 90-16592 Ben Franklin . occurrence of the beginning of such an event leaving open the existential status of its completion. Capitalizing on Bach s insight I present in the first part of the paper a new treatment of the imperfective paradox which relies on the

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• TRAJECTORY OF MOTION EVENTS
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