CHAT: natural active case lang

Hello y'all. (No, I live in Stockholm, not in the south of
Sweden or the US for that matter... :)

Excuse this off-topic natlangy question, but this is
getting frustrating. At least five times today, in three
different classes at uni, we've been discussing case
and semantic roles. Separately. I've been trying to
say something about langs that use case to mark
semantic roles, but then they ask me for examples
and I can't really say Tokana, now can I? :)
Then I start rambling about native American langs
and perhaps Papua New Guinea, but then they
just laugh. Hmm...

I've had it with this ridicule of me. I don't know=20
where to look, so if any of you can give me some
examples of natlangs and where they are spoken
I would be ever so grateful.=20

AFMCL, Rinya also uses case to mark semantic
roles rather than syntactic function, so I could really
use some natlang examples to improve the Rinya
system.

Thanks in advance,

Daniel Andreasson
daniel@conlang.nu