El operador modal de obligación por fuerza.

This paper analyzes a kind of discourse operator insufficiently studied: the operators that indicate deontic modality, especially those introduced by modal operators in Spanish like por fuerza, in order to locate the insertion of elements belonging to the plane of the modality in the structure of sentence. Checking characteristics of these terms: its distribution, its incidence, its grammaticalization, it can contribute, on the one hand, to its categorical and functional definition and, on the other hand, to development of discourse grammar or macrosyntax. [ABSTRACT FROM AUTHOR]