Predicting Prepositions for SMT

Representation and Prediction Features Initial experiments showed that replacing prepositions by simple place-holders decreases the translation quality. As an extension to the basic approach with plain place-holders, we thus experiment with enriching the place-holders such that they contain more relevant information and represent the content of a preposition while still being in an abstract form. For example, the representation can be enriched by annotating the place-holder with the grammatical case of the preposition it represents: for overt prepositions, case is often an indicator of the content (e.g. direction/location), whereas for NPs, case indicates