The preterite tense conjugations of “saber” (to know) describe completed past actions. They are formed by adding regular preterite tense endings (-é, -aste, -ió, -imos, -isteis, -ieron) to the verb stem “sab-“. The resulting forms are: yo supe (I knew), tú supiste (you knew), él/ella supo (he/she knew), nosotros supimos (we knew), vosotros supisteis (you all knew), ellos/ellas supieron (they knew).
