Intervention Effects in Alternative Questions

Alternative questions exhibit intervention effects, in that the disjunctive phrase may not be c-commanded by a focusing or quantificational element. This seems to hold crosslinguistically. We provide an analysis of this phenomenon that combines a focus semantic explanation of intervention effects in questions with an analysis of alternative questions in which the disjunctive phrase makes available appropriate alternatives in a way similar to a wh-phrase. We point out consequences for the analysis of intervention as well as for the analysis of alternative questions. We also note interesting further issues pertaining to the semantic contribution of disjunction.