“…Furthermore, these imperfect prepositions cannot govern infinitives, prepositional phrases, or sentences. However, at this point it should be remembered that prepositions, which express exclusively locative values, cannot govern sentences either: hacia 'towards', sobre 'on, about, upon', tras 'after, behind', bajo 'beneath', and ante 'before' do not form subordinate locative clauses (Pavón Lucero 1999, p. 571;2010;Sánchez López 2016). However, it must be remembered that already since the Middle Ages mediante can govern a relative clause (example 3) and that from the sixteenth to the nineteenth century it could appear before an infinitive (example 4).…”