 Deriving the Hittite ḫi-conjugation directly from the PIE thematic presents (like Couvreur did) involves huge problems, but that there is some connection seems very probable (in line with Pedersen and Watkins).All these three solutions, according to Jasanoff, present massive problems, not the least of which being that the way verbs are distributed between the two Hittite conjugations seems arbitrary, by and large, compared to the other PIE daughter languages.Even for this reason, it seems more probable that two categories serving one function have largely merged in the other languages (Sanskrit, Greek, Latin, etc.