This paper is an attempt to discover cognates for the Ryukyu locative-directive case suffixes
gari/*ri/*ra and
gati/*ti in Old Japanese, Old Korean, Manchu-Tungus, Mongolian, and Old Turkic.
The Ryukyu locative-directive case suffixes
gari/*ri/ra are compared to the fossilized Old Japanese directive case suffixes
gari, dative-locative
*ri/*ra; Old Korean lative case suffix
*ryu, directive case suffix
*ri; Ma-Tg directive case suffix
ri; Mongolian directive case suffix
ru;and Old Turkic locative-directive case suffixes
ru/ra/ry, directive case suffix
gärü.
The other Ryukyu directive case suffixes
gati/ti are compared with the fossilized Old Japanese directive case suffix
*ti, the Manchu-Tungus directive
*ti, the fossilized Mongolian directive
*ti, and the Old Turkic dative-locative
*ti.
All these pieces of evidence lead us to the conclusion that the Ryukyu locative-directive case suffixes and directive case suffixes are of Altaic origin.
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