What do the verbs almorzar (to eat lunch), dormir (to sleep), and repetir (to repeat) all have in common? (Besides the fact that we all want to eat lunch and take a nap over and over again?)

All of these verbs are stem-changing verbs in the present tense. Yo almuerzo, yo duermo, yo repito.

But what happens to these stem-changers in the preterit tense? In this section we’ll find out…