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- ir stem-changing verbs in the Preterite
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-ir stem-changing verbs in the Preterite -ar and –er verbs that have a stem change in the Present tense do not have a corresponding change in the Preterite. However, -ir shoe verbs do have a stem change in the Preterite tense. Unlike in the Present tense, they do not change in the “shoe”, they change only in the 3rd persons (he, she, you (Ud), they and you (Uds) forms. Present tense o>ue changes become o>u in the preterite. Present tense e>ie and e>ichanges become e>i in the Preterite.
Dormir (ue, u) PresentPreterite Duermodormimosdormídormimos Duermesdormísdormistedormisteis Duermeduermendurmiódurmieron
Sentir (ie, i) PresentPreterite Sientosentimossentísentimos Sientessentíssentistesentisteis Sientesientensintiósintieron
Pedir (i, i) PresentPreterite Pidopedimospedípedimos Pidespedíspedistepedisteis Pidepidenpidiópidieron