In El Presente, many verbs that end in -cer/-cir preceded by a consonant have a stem change in just the yo form: -c- changes to -z-. However, in El Presente de Subjuntivo, these verbs have this same irregularity in all forms.
Have a look at these two verbs conjugations in El Presente de Subjuntivo:
Consonant+CER verb |
CONVENCER |
yo |
convenza |
tú |
convenzas |
él/ella/usted |
convenza |
nosotros/nosotras |
convenzamos |
vosotros/vosotras |
convenzáis |
ellos/ellas/ustedes |
convenzan |
Consonant+CIR verb |
ESPARCIR |
yo |
esparza |
tú |
esparzas |
él/ella/usted |
esparza |
nosotros/nosotras |
esparzamos |
vosotros/vosotras |
esparzáis |
ellos/ellas/ustedes |
esparzan |
The endings are the same as for all regular -er and -ir verbs in El Presente de Subjuntivo.
Here are some examples:
Note that there aren't many common verbs with this irregularity. Other -cer and -cir verbs have a different consonant change.
See also Conjugate c>zc verbs -cer/-cir in El presente de Subjuntivo (present subjunctive).
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