Regular in Spanish (ending in ER or IR) are conjugated in the tense as follows:
1st person singular — o 2nd person singular – es ( tu sabes) 3rd person singular — e (el/ella/Usted sabe)
1st person plural — emos ( nosotros sabemos) 2nd person plural — eis ( vosotros sabeis) 3rd person plural — en ( ellos/ellas/Ustedes saben)
However, saber is irregular in the 1st person singular.
Instead of “sabo”, it becomes “se”.
Saber means “to know”.
I don’t know translated in Spanish would be
Yo no se or simply No se .