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“(“we sleep”). Ustedes duermen (“you sleep”). Ellos duermen (“they sleep”). Ellas duermen (“they sleep”). Acostarse (“to lie down”) and probar (“to try”) also belong in this group. Fifth Group The fifth group is also made up of verbs with a vocalic change in the root: in this case, from an E to IE. Again, these changes apply to all pronouns except for nosotros and nosotras. In this group, we can name the verb pensar (“to think”): Yo pienso (“I think”). Tú piensas (“you think”). Usted piensa (“you think”). Él piensa (“he thinks”).”
― Lingo Publishing, Mexican Spanish for Beginners: Your Guide to Speaking and Understanding the Language and Culture of Mexico with Confidence