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<Paper uid="C80-1015">
  <Title>A MODEL OF NATURAL LANGUAGE PROCESSING OF TIME-RELATED EXPRESSIONS</Title>
  <Section position="8" start_page="0" end_page="0" type="concl">
    <SectionTitle>
FINAL REMARKS
</SectionTitle>
    <Paragraph position="0"> In the linguistic level time-related morphemes are assigned on the basis of the categories of time-related expressions sent from the cognition level. Here the peculiarities of individual natural languages are involved. Therefore a unique program is required for each natural language. After the morpheme assignments, syntactic and morphological rules together with phonological rules determine the forms in the sentences.</Paragraph>
    <Paragraph position="1"> We shall omit detailed discussion on this level, since this process involving word categories closely related to the distinction between dynamic and static situations is complicated. For simplicaity of explanation, we have omitted the discussion and the programming of expressions of habit, experience and atemporal expressions.</Paragraph>
    <Paragraph position="2"> We have also omitted the discussion of relative tenses.</Paragraph>
    <Paragraph position="3"> In summary, we have discussed an automatic process of time-expression generation in natural language. We believe that this is only possible by the introduction of the speaker's time focus and an examination of the relationship between the extra-linguistic situational time and focused time. By further examining the manner of morpheme assignments in as many natural languages as possible, we believe, we can expand the number of universal rules common to all languages and minimize the number of rules peculiar to individual languages.</Paragraph>
    <Paragraph position="4"> (This research is partially supported by Japanese Ministry of Education grants Nos. 361200 and 561151.)</Paragraph>
  </Section>
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