Conjugate irregular verbs ending in -zar in el Pretérito Indefinido (simple past)

Verbs ending in-zar like: organizar (to organise), analizar (to analyse), cazar (to hunt) are irregular in El Pretérito Indefinido because the spelling changes for pronunciation reasons in the first person singular (yo).

yo organicé
organizaste
él / ella / Ud. organizó
nosotros / nosotras  organizamos
vosotros / vosotras  organizasteis
ellos / ellas / Uds. organizaron
Notice that the -z- is replaced with -c-. However, apart from the yo form, all the other endings are the same as those of regular -ar verbs: -aste, -o, -amos, -asteis, -aron.


Have a look at  and listen to these examples.

Crucé la calle con mucho cuidado.I crossed the street very carefully.

Organicé una fiesta sorpresa para Laura.I organised a surprise party for Laura.

Analicé el documento concienzudamente.I analysed the document thoroughly.

Cacé dos osos.I hunted two bears.

Here are some other examples with -z (not-c). Notice how the pronunciation is the same:

¿Quién organizó la fiesta de Susana?Who organized Susana's party?

Los niños pequeños no cruzaron la carretera solos.The little children didn't cross the road by themselves.

¿Cazasteis muchas mariposas en el parque?Did you catch lots of butterfies in the park?

For more verbs that follow this pattern see the Verb list: -zar verbs that change z>c in El Indefinido for the yo form

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Examples and resources

Analicé el documento concienzudamente.I analysed the document thoroughly.
¿Cazasteis muchas mariposas en el parque?Did you catch lots of butterfies in the park?
Organicé una fiesta sorpresa para Laura.I organised a surprise party for Laura.
Los niños pequeños no cruzaron la carretera solos.The little children didn't cross the road by themselves.
Crucé la calle con mucho cuidado.I crossed the street very carefully.
¿Quién organizó la fiesta de Susana?Who organized Susana's party?
Cacé dos osos.I hunted two bears.
I'll be right with you...