Estar preterite stem change
Estuv
Poder (can, to be able to) preterite stem change
Pud (can, to be able to)
Poner (to put) preterite stem change
Pus
Querer (to want) preterite stem change
Quis
Saber (to know) preterite stem change
Sup
Tener (to have) preterite stem change
Tuv
Venir (to come) preterite stem change
Vin
Decir (to say to tell) preterite stem change
Dij
Traer (to bring) preterite stem change
Traj