Company, Concepción. “Zero in Syntax, Ten in Pragmatics: Subjectification as Syntactic Cancellation”. Subjectification: Various Paths to Subjectivity....
Kaltenböck, Gunther, Evelien Keizer y Arne Lohmann, eds. Outside the clause. Form and function of extra-clausal constituents. Amsterdam/Philadelphia:...
Schiffrin, Deborah. Discourse Markers. Cambridge: Cambridge University Press, 1987.