conjugation.preterite.stem-third-person
Third-person stem change: durmió, pidió, sintió
-ir stem-changing verbs raise their vowel (e → i, o → u) only in the third person of the preterite: pidió/pidieron, durmió/durmieron — and in the gerund.
conjugationB1v1.0.0
Erklärung
Every -ir verb that changes its stem in the present also changes it in the preterite — but only in the third person, and always by raising: e → i (pedir → pidió, sentir → sintió, preferir → prefirió) and o → u (dormir → durmió, morir → murió).
The other persons are regular: pedí, pediste, pedimos, pedisteis; dormí, dormiste. -ar and -er stem-changers never do this: pensó, volvió are regular.
The raised stem reappears in the gerund (pidiendo, durmiendo, sintiendo), the nosotros/vosotros present subjunctive (pidamos, durmáis), and the whole imperfect subjunctive (pidiera, durmiera).
Beispiele
He ordered a coffee without sugar.
Region: global
They slept ten hours.
Region: global
I felt very cold last night.
Region: global