Here we explain all irregular in the preterit. Some are just spelling changes others are irregular verbs in the preterit.
| I. | Spelling changes |
| II. | Ir verbs with spelling changes |
| III. | Accentuated i |
| IV. | Ir/ser 7 Dar &Ver |
| V. | Irregular roots & irregular endings |
| · | Hacer:Spelling change C:Z |
| · | * * Stems ending in-:ierons becomes eron |
1. Regular verbs that end in- car ,gar and zar change the spelling of the preterit”yo” form in order to preserve the same sound as the infinitive
Buscar(also:pescar,sacar,etc)
| No: Yo busce | BUT:yo busque |
| Llegar(also :jugar,pagar.etc)No:yo llege | BUT:yo llegue |
| Almorzar(Also:empezar,realizar,etc) | |
| No: Yo almorze | BUT: yo almorce |
2. Verbs in the- ir group that have spelling changes in the present also has spelling changes in the preterit but not always the same changes and onlyi nthe third person singular and the third person plural
| Presente: | o:ue | e:ie | e:i |
| Preterito: | o:u | e:I | e:i |
| Dormir & Morir | divertirse | Pedir | |||
| presente | preterito | Presente | Preterito | Presente | Preterito\ |
| Duermo | dormi | me diverto | e diverti | pido | pedi |
| Duermes | dormiste | te divertes | me divertiste | pides | pediste |
| Duerme | durmio | se diverte | se divirtio | pide | pidio |
| Dormimos | dormimos | ns divertimos | ns divertimos | pedimos | pedimos |
| Duermen | durmieron | se diverten | se divirteiron | piden | pidieron |
3. The following irregular verbs(always ending in-er&ir) have an accenturated I expect when between to vowels(that is in the third person singular and third person plural), where the I changes to y.
Caer:cai,caiste,cayo,caimos,cayeron
Creer: crei,creiste,creyo.creimos,creyeron
Leer:lei,leiste,leyo,leimos,leyeron
Oir:oi,oiste oyo oimos oyeron
Al verbs ending in –uir: construer: contrui,construiste construyo,construimos* construyeron* the letter”I” in the second person personal and second plural don’t ned accet mark to be accentuated.this is because the u 7 I together form a dipthong and that case the accent always comes on the second letter. other verbs :incluir, sustituir, influir, huir etc