If a verb is a stem changer in the present tense, it will not stem-change in the preterit unless it is an - ir verb. No - ar or - er verbs will stem-change in the preterit.
The verbs mentir (to lie) and pedir (to request) undergo a stem change from (e) to (i) in the "Ud./él/ella" and the "Uds./ellos/ellas" forms only. The conjugation of the verbs are shown below.
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