Our main purpose is to present our experience working on a free spoken-language corpus in Spanish. As part of my doctoral thesis project, concerned with rephrasing used in spoken interaction, I decided to study this phenomenon by analyzing the data available in the PRESEEA corpus. In order to annotate a part of this corpus, we created a TextGrid file on PRAAT associated with each audio file. Then, we imported those files onto ELAN to start the annotation process, with categories related to five language levels relevant for our research: prosodic, syntactic, macrosyntactic, interactional and rephrasing phenomena. In addition to sharing our methodological work experience, we would like to emphasize the importance of free spoken corpora for the development of the research in linguistics.