Preposiciones y Pronombres 1. The propositions entre and según are followed by YO and TU instead of mí and ti. 2. The prepositional pronoun becomes si if the subject of the sentence and the prepositional pronoun refer to the same person or object. The preposition con becomes conmigo when it is followed by mi and contigo when it is followed by ti; and it becomes consigo when followed by si. ex. ¿Quieres ir conmigo al cine? Sí, con mucho gusto voy contigo. El chico siempre lleva un libro consigo. (with himself) Note: If a prepsotion is followed by a verb, the verb will be in the infinitive form ALWAYS!.