The paper investigates the mechanism of functional transposition of nouns such as «truth», «fact» into the category of peripheral introductory-modal units, which represent a special introductory-modal type of use of substantive lexemes in simple complicated sentences. Using the methods of oppositional analysis and indexing, the calculation of the degrees of correspondence of the peripheral introductory-modal word «truth» to the original noun «truth» and the derived non-substantive introductory-modal word-conjunction «truth» was made. The combinatorics and the specific weight of the differential features of nuclear nouns and introductory-modal units in the structure of the «truth» modal used to assess the transmitted state of affairs in terms of its reliability are revealed. It was found that the degree of correspondence (similarity and difference) of the differential features of the peripheral introductory-modal word «truth» to the differential features of the original noun «truth» is 11%, and the degree of correspondence of its differential features to the features of the nuclear introductory-modal word-union truth is 60%. The research results can be useful in the development and application of quantitative methods for analyzing the facts of transitivity and syncretism in the grammatical structure of the Russian language.
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