La gramaticalización de lo que es como operador discursivo
This work focuses on the analysis of the discursive values of the construction lo que es in contrast to its compositional values (thematizer values, peripheral focus operator and concretion operator). We approach the chronological reconstruction of the process that has carried out these discursive uses since the origin of the construction as a relative substantive sentence, but without reaching a full bleaching of its components. The methodology starts from the analysis of the RAE corpora (CREA, CORDE, CDH and CORPES XXI). The query shows that current discourse values are set in the 19th century, although they are based on thematizer uses of the 16th century that had become colloquial.