Reconstructing last week's weather:
Syntactic reconstruction and Brythonic free relatives

Abstract

Lightfoot (2002) argues that syntactic reconstruction is rendered impossible by the lack of any analogue in syntax to the traditional notion of the phonological 'correspondence set' of the Comparative Method and by the radical discontinuity caused by reanalysis between successive grammars. Alice Harris and Lyle Campbell, in various works, have defended the notion of &lquo;syntactic pattern&rquo; as the analogue of the correspondence set, arguing that patterns can be compared across languages, with innovations being stripped away to reveal aspects of the protolanguage. In this article, I argue that syntactic reconstruction can be carried out while maintaining and indeed utilizing core notions in generative approaches to syntactic change such as the central role of reanalysis and child language acquisition and the distinction between the abstract grammatical system and the surface output of that system. Reanalysis itself is constrained by the fact that both pre- and post-reanalysis grammars must be acquirable on the basis of the same primary linguistic data. This imposes limits on the possible hypotheses that can be entertained (‘local directionality’) even in the absence of any crosslinguistic generalizations about patterns of change (‘universal directionality’). This approach is then applied to aspects of the syntax of free relative clauses and negation in the early Brythonic Celtic languages (Welsh, Breton and Cornish), showing that non-trivial reconstructions can be achieved even where the daughter languages manifest significant differences.
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