Certain verbs must change their spelling in order to preserve the sound of the consonants in their inflected forms. This often happens in verbs that end in -car, -gar, and -zar. Examples of these verbs are tocar, llegar, and empezar, and the changes occur only in the first person of the preterite indicative as well as in all of the forms of the the present subjunctive. Note the changes of -c to -qu, -g to -gu, and -z to -c in the following tables:
*Note the changes of spelling that take place only in these forms.
Irregular verbs in the future and
conditional
Irregular verbs
in the imperfect
Irregular
verbs in the present
Irregular verbs in the
preterite
Irregular
verbs in the subjunctive
Verbs