: It is a staple for students preparing for the DELE exams (Diplomas de Español como Lengua Extranjera) and is frequently cited in university syllabi for advanced Spanish linguistics and teaching programs.
Identifies if the term is a conjunction, preposition, etc.
Be careful. Many free PDFs circulating online are corrupted, missing pages (often the answer keys at the back), or are scanned copies of older editions (2007 vs 2020). The 2020 edition includes updated examples related to technology and modern life. If the PDF lacks the "Soluciones" (answers) section, it is useless for self-correction.