The Mapping of Thematic Roles to Grammatical Functions in Mandarin BA Construction Denoting Causation: From the Perspective of Lexical Mapping Theory
NP1 in the position of the subject of the mandarin BA construction denoting causation is usually occupied by patientlike roles and NP2 immediately following BA is usually occupied by agentlike roles. The causative relation between NP1 and NP2, with the former being the Cause, and the latter the Affectee, derives from the word BA, which triggers in the lexicon the morpholexical operation of causativization when it unites with the predicate. The operation involves either assignment of causative roles Cause and Affectee to the existent thematic roles or insertion of a new role Cause to the thematic structure, with the prominence of Cause or the thematic role assigned Cause always being over the other roles. Having undergone this morpholexical operation, the thematic structure correctly maps to and generates the grammatical functional structure according to the general principles and conditions stipulated by the Lexical Mapping Theory (LMT). The result of this research shows that even for a construction as unique as the mandarin BA construction denoting causation compared with any other languages, LMT is still well applicable in explaining its role-function mapping.