Open Access

Randy J. LaPolla

• For this paper, 170 Tibeto-Burman languages were surveyed for nominal ease marking (adpositions), in an attempt to determine ifit would be possible to reeonstruet any ease markers to Proto· Tibeto-Burman, and in so doing leam more about the nature of the grammatieal organization of Proto-Tibeto-Burman. The data were also eross-cheeked for patterns of isomorphy/polysemy, to see ifwe can leam anything about the development ofthe forms we da find in the languages. The results of the survey indicate that although a11 Tibeto-Bunnan languages have developed some sort of relation marking, none of the markers ean be reconstrueted to the oldest stage of the family. Looking at the patterns of isomorphy or polysemy, we find there are regularities to the patterns we find, and on the basis of these regularities we can make assurne that the path of development most probably followed the markedness/prototypicality clines: the locative and ablative use would have arose first and then were extended to the more abstract cases.