1A Rule-Based and Corpus-Or iented Approach to Prepositional Phrases Attachment

Prepositional Phrase is the key issue in structrual ambiguity. Recently, researches in corpora provide the lexical cue of association among prepositions and other words and these information could be used to resolve partly ambiguity resulted from prepositional phrases. Two possible attachments are considered in the existing approaches: either noun attachment or verb attachment. In this paper, four different attachment are told out according to their functionalities: noun attachment, verb attachment, sentence-level attachment, and predicate-level attachment. Both lexical knowledge and semantic knowledge are envolved resolving attachment in the proposed mechanism. Experimental results show that considering more types of presitional phrases is useful in machine translation.