Add to ORKGThe goal of this paper is to offer a unified analysis of the morphological structure of spatial adpositions and spatial case markers in three languages: English, Spanish, and Finnish. This analysis combines Distributed Morphology assumptions with a Type-Logical formal treatment. Two key results emerge from this unified morpho-syntactic analysis. First, spatial adpositions (behind, encima, laelta) can be accounted as the result of merging different “types” of spatial morphemes, including spatial case markers and particles. Second, cross-linguistic syntactic phenomena involving these categories (e.g. argument demotion) can also be accounted for straightforwardly, via our analysis. We suggest that these results also support a “morphology all t...