1.12 Present Indicative: Stem-Changers
Some verbs have a stem-change in the present tense (meaning, one of the vowels changes when you conjugate the verb).
1. When you learn each verb, you have to memorize if it has a stem-change.
2. Jugar (u-ue) is the only verb that has a stem-change of u à ue. It happens in all forms except nosotros/ vosotros.
3. No verb has a stem-change in the nosotros/ vosotros forms.