This article argues in favor of a new type of Merge, Parallel Merge, which combines the properties of External Merge and Internal Merge. Parallel Merge creates symmetric, multidominant structures, which become antisymmetric in the course of the derivation. The main empirical goal of the article is to revive a multidominance approach to across-the-board wh-questions and to show that a number of otherwise puzzling properties of across-the-board questions follow naturally from such an account.

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In this paper, we develop a new typology of multiplewh-questions with coordinatedwh-pronouns. We motivate the existence of three distinct structures for such questions: one mono-clausal and two bi-clausal. We use four kinds of diagnostics to determine which of the three structures is available in a particular language: the availability of both multiplewh-questions andwh-questions with coordinatedwh-pronouns, coordination of two argumentwh-phrases, transitivity restrictions and superiority effects.