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

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?


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.


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