Contreras Izquierdo, Narciso M., and Fermín Martos Eliche. 2020. “The Formulaic Sequences (FS) in the Teaching of Spanish As FL / 2L. The Lexical Frequency As a Levelling Criterion”. Porta Linguarum An International Journal of Foreign Language Teaching and Learning, no. 33 (January). Granada, Spain:111-27. https://doi.org/10.30827/portalin.vi33.26640.