The main aim of this paper is to analyse a learner corpus containingoriginal written productions in the compulsory forums created in a con-crete undergraduate subject. The reason for choosing the forum is that it isa space in which students can discuss in a more spontaneous way. The cor-pus compiled for this study will be managed with the corpus managementsoftware program AntConc. The study will be focused on the way thesestudents have contributed to the forums but paying special attention to theexpressions used in their openings and endings in written participations.