Spanish Stem-Changing Verbs (Boot Verbs) in the Present

Short answer

In e→ie, o→ue and e→i verbs the stressed stem vowel changes in every form except nosotros and vosotros — which is why the pattern is drawn as a boot. Quiero, quieres, quiere, queremos, queréis, quieren.

Level A1 · verbs, present, irregular

The rule in full

The vowel in the stem changes in every form except nosotros and vosotros — draw a boot around the forms that change.

e → ie (querer)o → ue (poder)e → i (pedir)
yoquieropuedopido
quierespuedespides
él/ellaquierepuedepide
nosotrosqueremospodemospedimos
vosotrosqueréispodéispedís
ellosquierenpuedenpiden

Also in this family

e → ieo → uee → i
pensar, empezar, entender, preferirdormir, volver, encontrar, contarservir, repetir, seguir

jugar is the only u → ue verb: juego, juegas, juega…

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