The study of word classes has a history of over 4000 years, and the word class problem in over 1000 analytic languages like Modern Chinese can be seen as the Goldbach Conjecture in linguistics. This paper first outlines the existing problems in the POS tagging of Modem Chinese corpora with a case study of 自信. Then it introduces the Two-level Word Class Categorization Model in analytic languages, which is based on the perspectives of language as a complex adaptive system and the nature of major parts of speech as propositional speech act functions. Finally, the implications of Two-level Word Class Categorization Model for POS tagging in Modern Chinese corpora are explored.
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