In present-day German, nine “two-way prepositions” can take either the accusative (ACC) or dative (DAT), viz. an, auf, hinter, in, neben, über, unter, vor and zwischen. In traditional explanations, ACC is associated with ‘motion’/‘directionality’ and DAT with ‘location’/‘state’. A similar conceptual contrast can be found in many modern accounts, which oppose ‘focus on the path’ and ‘endpoint focus’. While such a contrast may be satisfactory with respect to verbs such as gehen ‘go’, laufen ‘run’, wandern ‘wander’ etc., the ACC/DAT alternation with more complex verbal constructions cannot be accounted for in this way. This article provides an alternative explanation, which is corpus-based and couched in a constructional framework. The case st...