Spanish Present Indicative Irregularities

Vocabulary and rule-based flashcards reviewing stem changes, -uir additions, first-person irregularities, and particular verbs in the Spanish present indicative tense.

Stem Diphthongization Rule

The rule stating that only stressed stem vowels diphthongize in the present indicative, meaning first-person and second-person plural forms (nosotros and vosotros) remain unaffected.

El verbo jugar (Diphthongization)

The only verb in Spanish that displays a $u \rightarrow ue$ stem diphthongization in the present indicative (e.g., juego, juegas, juega, juegan).

Verbos como sentir (e -> ie)

-ir verbs that diphthongize from $e \rightarrow ie$ in stressed stem vowels (siento, sientes, siente, sienten), while maintaining the regular vowel in sentimos and sentís.

Verbos como pedir (e -> i)

-ir verbs that undergo a vowel change from $e \rightarrow i$ in stressed stem vowels (pido, pides, pide, piden), leaving the nosotros (pedimos) and vosotros (pedís) forms unaffected.

Verbos en -uir (e.g., construir)

Verbs ending in -uir that add a "y" in the present indicative for all forms except nosotros (construimos) and vosotros (construís), resulting in construyo, construyes, construye, and construyen.

Irregularidad de 1ª persona

A category of present indicative verbs where irregularity occurs exclusively in the first-person singular (yo) form while the remaining persons conjugate regularly.

-go First-Person Verbs

Verbs in the present indicative whose yo form irregular ending is -go, including caer (caigo), hacer (hago), poner (pongo), salir (salgo), tener (tengo), traer (traigo), and valer (valgo).

Caber (Present Indicative Yo-Form)

An irregular first-person singular form conjugated as quepo.

Saber (Present Indicative Yo-Form)

An irregular first-person singular form conjugated as sé.

Verbos particulares

Verbs with unique combined irregularities in the present indicative, specifically highlighted as venir (vengo, vienes…), decir (digo, dices…), and oír (oigo, oyes…).