Irregular Yo

Some present tense yo conjugations undergo spelling changes or are irregular.

Verbs with Spelling Changes in the Yo Form

Verbs that end in -guir, -ger, or -gir undergo a spelling change in their present tense yo forms.

• For verbs that end in -guir, the yo form ends in go.
• For verbs that end in -ger or -gir, the g in the yo form changes to a j.

Here are examples of verbs that have yo spelling changes.

Verbs with Irregular Yo Forms

The following verbs have irregular yo forms. The other present tense forms of these verbs follow the patterns for regular -ar, -er, and -ir verbs.

Here are examples of verbs with irregular yo spelling changes.

Prefixes Count

Verbs made up of the above forms plus a prefix are also irregular in the yo form. Check out these examples.

Irregular in All Forms

There are a number of verbs that have irregular forms other than the yo form. These include stem-changing verbs, spelling-change verbs, and verbs that are considered truly irregular.

Four of the most frequently-used verbs in Spanish (ser, estar, ir, and haber) are irregular. The present indicative conjugations for each are given below.

Irregular Conjugations

Ser and Estar

Ir and Haber