Verbos con cambio ortográfico e > i (presente)

Stem-changing Spanish e > i verbs in the present tense

A number of Spanish verbs are semi-regular because they undergo a stem change (e > i) in the present tense in all forms except nosotros and vosotros, but the usual endings still apply. This stem change only occurs in verbs ending in -ir.

The essential verbs decir and pedir follow this pattern but there are many more:
Verb list: Stem-changing (e > i) verbs in the present tense

These verbs can be further divided into three subgroups based on other irregularities they also have.

Clever stuff underway!