The arrangement of sentence constituents, without blanks in between written words and without relative linkers or conjunction in complex and compound sentences, complicates Thai syntactic analysis. These problems are made even more difficult by the fact that modifiers of Thai sentences may follow words modified and a sequence of single verbs may form a verb phrase. However, GPSG's ID rules, LP rules and FSD constraints without any meta rules can concisely represent the structure of Thai sentences.
Syntactic ambiguity is reduced by introducing semantic relationships between verbs and nouns.
The approximately 2,000 Thai verbs are sub-divided into 16 groups, based on their semantics. Based on the subcategorization, a Thai GPSG is developed using the PATR formalism allowing features of subcategories to be declared. A test of some selected sentences has shown that the number of resulted parse trees has been reduced. Keywords GPSG, Thai parsing, PATR, chart parser, disambiguation. Back to previous page.