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Les verbes labiles dans l’histoire de la famille indo-européenne: une perspective typologique diachronique
This article deals with the history of oppositions of transitivity and the evolution of the system of labile verbs (verbs which admit changes in transitivity without formal change of the verb, cf. La clé tourna dans la serrure ~ Pierre tourna la clé dans la serrure). It focuses on the evolution of labile verb systems in a few branches of the Indo-European language family, which show crucial changes in this area of the morpho-syntactic system (Germanic, Slavic, Indo-Iranian). By integrating data from these linguistic groups with those from other Indo-European and non-Indo-European branches that attest to radical changes in the system of labile verbs (such as Semitic or Chinese), the article uncovers the mechanisms responsible for the emergence and disappearance of lability. The hypothesis of a high degree of lability in the ancient Indo-European syntax is the subject of a critical analysis. This contribution clarifies the position of Indo-European languages from the point of view of the history of transitivity types and contributes to our understanding of Proto-Indo-European syntax. In addition, the article explains why in several languages the class of labile verbs is constantly increasing (as in English or Greek), while in other languages this class is decreasing (as in Sanskrit) or completely lacking (as in Turkish). It discovers, systematizes and explains the characteristics and processes that determine the evolution of transitivity and the modifications of the syntactic characteristics of verbs.