"Gap" matters: reflections on the notion of "gap" of relative clauses.

This study aims to re-examine the essential notion of "gap" in the studies of relative clauses. Following Creissels' (Creissels, Denis. 2006. Syntaxe générale: une introduction typologique. Paris: Hermès; Creissels, Denis. 2019. Remarks on the typology of noun-modifying clause constructions. Paper presented at the Conference of Complex Sentences, Central China Normal University, 26–29 July) discussion, we argue that there are at least three types of gaps in terms of their respective compositions, namely the gap corresponding to a zero-marked constituent, the gap corresponding to a case-marked constituent, and the gap corresponding to an adposition-marked constituent. This classification, which is not based on the grammatical relation of the relativized constituent in the relative clause but focuses on the composition of the gap, can better explain the existence of the so-called "enlarged gap", a special type of gap that has been almost completely ignored so far. Moreover, this marking-based approach can shed new light on Keenan and Comrie's (Keenan, Edward & Bernard Comrie. 1977. Noun phrase accessibility and universal grammar. Linguistic Inquiry 8(1). 63–99) Accessibility Hierarchy. In particular, we argue that some interplay of the syntactic position and the morphological marking of a syntactic object determines whether the constituent can be relativized. [ABSTRACT FROM AUTHOR]