Abstract: In this paper we document the existence in a Romance language of a strategy of do (fa) insertion in main non-subject interrogatives parallel to the well-known English case. As our description illustrates, the set of contexts where do-support applies in this language is a proper subset of the English contexts. The syntax of fa-support in a language with typical Romance features allows us to draw some general conclusions regarding the analysis of English do-support and the interfaces between syntax and morphology, on one side, and syntax and lexical-semantic structure, on the other.