σσ. 284-307 ; In this paper we look at how, in different dialects of Dutch, questions are formed in which a question word crosses a clause boundary. Many dialects allow doubling constructions in which two question words appear, rather than one. Some dialects have identical doubling (with two identical question words) whereas other dialects have non-identical doubling (with two distinct-looking question words). We argue that the variation basically follows from the copy theory of movement, in which both full and partial copying are allowed. If correct, the proposal has consequences for the nature and structure of pronouns. Question pronouns, we argue, spell out different phrasal projections that can be independently motivated. The advantages of our approach to alternative proposals are made explicit. ; Nederlandse Taalkunde