-History of the German Language

Two-Way Prepositions
College of William and Mary
Always Accusative (do first)
Always Dative (do second)
Either Dative or Accusative (do third)
About.com
two-way preps. (part 1)
two-way preps. (part 2)
two-way preps. (part 3)
Exeter University
two-way prepositions