Stem-changing -ir verbs in the present subjunctive follow the same pattern as stem-changing -ar and -er verbs, where the stem change occurs in all forms except for nosotros and vosotros. However, the specific stem changes may differ between the -ir verbs and the other two verb types. Additionally, some -ir verbs may have irregular subjunctive forms that do not follow a predictable pattern, unlike most -ar and -er verbs. Finally, the conjugation endings for -ir verbs in the present subjunctive are unique to -ir verbs and do not follow the same pattern as -ar and -er verbs.
