After discoursing on the concepts natural reality and artificial reality – with respect to the grammatical and natural tenses – and showing examples of secondary uses of the personal forms of the indicative and potential moods, this article briefly reviews the theory of linguistic temporality of Guillermo Rojo. As a result, it is pointed out that this author’s system for conjugating Spanish verbs, formulated with vectors, involves a certain rigidity and arbitrariness, because there are various exceptions to the rule that affect the defined primary temporal value.