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Published online by Cambridge University Press: 06 May 2014
Within the Head-driven Phrase Structure Grammar (HPSG) community, one part of the Base Hypothesis concerning free relatives proposed by Bresnan & Grimshaw (1978) has gained wide support, namely that free relatives are headed by the wh-phrase. The second part of the hypothesis is that the wh-phrase is base-generated, and this has not gained support. In this paper, we will consider a subset of free relative constructions, i.e. non-specific free relatives, and provide support for this second part, restated in HPSG terms as a claim that there is no filler–gap relation between a free relative pronoun filler and a gap in the sister clause of the free relative pronoun.