1. STEM-CHANGING VERBS IN THE PRETERITE
3rd person

2. STEM-CHANGING VERBS IN THE PRETERITE
Affects –ir verbs in the preterite that are stem-changers in the present tense
The stem change affects only the él/ella/Ud. and ellos/ellas/Uds. forms
There are 2 types of stem changes:
e→i
o→u

3. STEM-CHANGING VERBS IN THE PRETERITE
There are 2 verbs in the preterite that change from o→u:
dormir morir

4. STEM-CHANGING VERBS IN THE PRETERITE dormir
Dormiste
Durmió
Dormimos
Durmieron

5. STEM-CHANGING VERBS IN THE PRETERITE morir
Moriste
Murió
Morimos
Murieron

6. STEM-CHANGING VERBS IN THE PRETERITE
There are many verbs that change from e→i in the 3rd person preterite. Here is a sample list of such verbs:
Servir
Sugerir
Repetir
Preferir
Vestirse
Despedirse
Pedir

7. STEM-CHANGING VERBS IN THE PRETERITE Example: servir
Serviste
sirvió
Servimos
sirvieron