An Application of Verb-phase Patterns to Causative/Passive Clause

S.-I. Yang, M.-P. Hong, Y.-K. Kim, C.-H. Kim, Y.-A. Seo, and S.K. Choi (Korea)

Keywords

case information, VerbPhrase Pattern, causative/passive clause, case frame

Abstract

The decision of an NP-case in a clause which takes a verb as its head word, plays a very important role for syntactic analysis in a Korean sentence. To make this decision, Korean parser might employ a case restriction which consists of the meaning of a verb, postposition and the sense of noun. Korean postpositions attached to a noun usually present its case information. But this case restriction database of the triple meaning pair forms of is very labor-intensive. This obstacle makes it hard to construct a large database. We use Verb-Phrase Patterns that describe all the case restrictions in a verb phrase. Verb-Phrase Patterns are created for active sentences. According to the change of input sentences to the causative and passive form, the case information would be changed too. If the case restrictions are changed depending on causative/passive form, we need to build more Verb-Phrase Patterns for causative/passive form. In this paper, to avoid building additional case information for causative/passive sentences, we propose a method to generate Verb-Phrase Patterns for such sentences automatically. To minimize semantic distortion, the application of Verb-Phrase Patterns adopts bi directional comparison. First, the causative/passive input sentence is compared with Verb-Phrase Patterns which are generated automatically. Second, we try to regulate causative/passive input sentence to active sentence and compare it with basic Verb-Phrase Patterns which are constructed by human. Each comparison gets a heuristic weight that can be used to decide its case.

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