Here is a cross-posting from the Indic list.
Someone may have a helpful response to make.
A curious thing about Hittite and the RV injunctive
is that in Hittite,
secondary endings are said to function as marking a
I can't see how the RV injunctive functions develop out of
Also, according to Bybee et al "The evolution of
grammar", zero past
vs marked present is unknown in contemporary languages.
Hittite seem quite strange. There have been suggestions
sentence particles in Hittite had an aspectual role. I wonder
the current thinking is.