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a-jə̀yas a-q’nə̀
def-river 3sg-at
‘at the river’
Anyway, what I'm interesed in now is what happens next. Another step in grammaticalization cline could be turning person inflected adposition into a case suffix (if it would be originally a postposition) - provided it would preserve person inflection. The result would be former person inflection trapped between noun root and former postposition. Since probably the most frequent person inflections on adpositions used with nouns (or I should rather say: the only person inflections on adpositions used with nouns) would be those for 3rd person, resulting case forms would be additionaly inflected for number. In other words, the minimal scheme for noun inflection would look like this:
Noun-SG
Noun-SG-3SG-Case
Noun-PL
Noun-PL-3PL-Case
The question is: do you know any attested examples of such outcomes? I have read somewhere that some papuan languages underwent evolution of person-inflected postpositions I am talking about, and perhaps another, non-papuan language did this, but I was unable to recall or find anything specific about source of this information and its details, so I'm hoping someone here knows something more...
Thank you in advance!