Abstract

This paper establishes the novel generalization that Subject -Auxiliary Inversion in comparative clauses requires the co-presence of VP-ellipsis, and argues that this peculiar fact follows from a disjunctive formulation of an ECP that applies at PF. The analysis relies crucially on the presence of an intermediate trace of the A'-moved comparative operator at the edge of VP, which is subject to the ECP at PF, and which interacts with the head movement involved in SAI. This trace is unlicensed in structures with I-to-C movement, but VP-ellipsis repairs the violation, providing further evidence that ellipsis can repair otherwise deviant structures