Verbs ending in -enzar with diphthong follow conjugation pattern of pensar except for alternation of "c" -> "z" before "e" in 1st person of indicative past simple (comencé), all persons in subjunctive present (comience, comiences…) and 1st pers. pl. and 3rd pers. sg. and pl. of imperative (comience, comencemos, comiencen)
3 verbs follow this model. Below an extract:
To see other models, refer to Model Table
Based on the ending, you can identify features that different verbs have in common. Click on the verbs above to see their conjugation tables and explore their conjugation patterns.