-ir ‘shoe verbs’ in the Preterite tense -ir ‘shoe verbs’ that change from e>ie or e>i in the Present tense have a change from e>i in the third person (he/she/it/ud/ellos/ellas/uds) in the Preterite tense.
Present Preterite prefiero preferimos preferí preferimos prefieres preferís preferiste preferisteis prefiere prefieren prefirió prefirieron pido pedimos pedi pedimos pides pedís pediste pedisteis pide piden pidio pidieron
-ir ‘shoe verbs’ that have a change from o>ue in the Present tense have a change frome o>u in the third person in the Preterite tense. Present Preterite duermo dormimos dormí dormimos duermes dormís dormiste dormisteis duerme duermen durmió durmieron