Spanish present tense consonant change c > zc in -cer/-cir verbs

In Spanish, the  -c changes to a -zc in El Presente for many verbs that end in -cer/-cir that are preceded by a vowel. This only affects the yo form. Have a look at these two verbs conjugations in El Presente.

 Vowel+CER verb 

CONOCER
(to meet/know)

yo

conozco

conoces

él / ella / usted

conoce

nosotros/nosotras

conocemos

vosotros/vosotras

conocéis

ellos/ellas/ustedes

conocen



 Vowel+CIR verb 

PRODUCIR
(to produce)

yo

produzco

produces

él /ella/usted

produce

nosotros/nosotras

producimos

vosotros/vosotras

producís

ellos/ellas/ustedes

producen


Note that common verbs hacer (to do/make) and decir (to say) do not have this type of irregularity! They are still irregular though, see Verbos yo -go (presente).

For other verbs within this same irregularity see:

Learn more about these related Spanish grammar topics

Examples and resources

Esa fábrica produce mucho plástico.
That factory produces a lot of plastic.


¿Tú conoces a mi amiga Marta?
Do you know my friend Marta?


Ellos no conocen a la novia de Miguel.
They don't know Miguel´s girlfriend.


Yo conozco a David Martínez.
I know David Martínez.


Nosotros no conocemos a mucha gente en este pueblo.
We don't know many people in this village.


¿Vosotros producís aceite de oliva virgen?
Do you produce virgin olive oil?


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