Footnote: yo = I, tú = you (informal), usted (Ud.) = you (formal), él = he, ella = she, nosotros = we (males/mixed group), nosotras = we (females), vosotros = you guys (informal, males/mixed group), vosotras = you guys (informal, females), ellos = they (males/mixed group), ellas = they(females), ustedes (Uds.) = you all (formal)
Now let's look at an (er) verb. The verb meaning (to run) in Spanish is correr. We add the proper endings and display the future tense forms of the verb correr in the table below.
Now let's look at an (ir) verb. The verb meaning (to write) in Spanish is escribir. We add the proper endings and display the future tense forms of the verb escribir in the table below.