The scope of preverbal operators in Thai
This paper explores and explains the relationship between the ordering properties and the semantic categories of thai preverbal operators.
Introduction
operators,as categories that are proposed in role and reference grammar, indicate grammatical categories such as tense, aspect and modality
they can be dis distinguished from the constituent structure of a sentence. clause, predicate and argument
the elements that indicate these grammatical categories occur preverbally and postverbally
in some previous studies they are called pre-varbal or post-verbal auxiliaries, preverbs and modals.
even though these studies do not agree on the number of element to be included in the category, they all recognize their ordering complexity.