Recently, CG dictionary was created to be syntactic data for Thai parser. It contains required information for parser to analyse a sequence of Thai language behaviour to determine its grammatical structure.
We obtain Thai words from LEXiTRON dictionary to create a Thai word list. Categorial grammar (CG) is applied to represent grammatical structure for Thai word. Each Thai word is carefully observed its behaviour by examples from Orchid corpus. After observation, the list of Thai argument syntactic categories are created according to CG formalism described in section 4. We determine to have six argument syntactic categories listing in Table 2.