When is the letter you accented in conjugated verb enviar present tense?

The letter that changes in the present tense conjugation of "enviar" is the "i". It changes to "í" in the third person singular (él/ella/usted) and the third person plural (ellos/ellas/ustedes) forms.

Here are the present tense conjugations of "enviar":

* yo envío

* tú envías

* él/ella/usted envía

* nosotros/nosotras enviamos

* vosotros/vosotras enviáis

* ellos/ellas/ustedes envían