Our paper addresses the reconstruction of the Proto-Indo-European (PIE) case and alignment system and questions the hypothesis that PIE had nominative-accusative alignment. We argue that the rise of split-gender ergativity in Anatolian was prompted by the fact that proto-neuter nouns like *d oru were not used in A-function before Proto-Anatolian (Yakubovich 2011). Our first hypothesis is that neuter nouns changed their alignment to S = P = A only after the separation of the Anatolian branch. We further reassess the theory of 'protomiddle' origin of the thematic conjugation (Watkins 1969;Jasanoff 1998). We propose a wedding of hypotheses by combining the idea of alignment change with this theory. This includes the reconstruction of a PIE antipassive construction, as recently outlined by Pooth et al. (2019). The scenario implies that PIE had semantic alignment, and that the voice opposition was triggered by prototypical agency and transitivity in semantic terms (Pooth 2011;Pooth et al. 2019).
INTRODUCTION
Research question, aims, methods, structureRegarding the linguistic reconstruction of morphological and syntactic categories of Proto-Indo-European (henceforth PIE) two major hypotheses are still controversially discussed within our field. These are: (1) PIE had a case-marking and alignment system of a type that was different from the Greek and Sanskrit nominative-accusative alignment (Uhlenbeck 1901, Pedersen 1907, Kortlandt 1983, Willi 2018, 2. There was a middle (or 'protomiddle') to active shift in a period before the IE languages, and the bh arati/φέqx conjugation and ḫiconjugation go back to protomiddle forms (Watkins 1969, Jasanoff 2003. Up to the present day, no attempt has been made to combine these two hypotheses. However, we believe that a combination strengthens their explanatory value. Our major aim is to show that the genesis of nominative-accusative alignment and the rise of new active (or 'neo-active') verb forms with protomiddle morphology (viz. the Anatolian ḫiconjugation, the perfect, and the IE thematic *The elaboration of parts of this paper was supported by the European Research Council EVALISA grant ID 313461 (PI J ohanna Barðdal) and by the ANID-FONDECYT research grant #11170045. We thank the anonymous reviewers and the former editor for valuable comments. We also express our gratitude to Jay H. Jasanoff and Simon Fries.