sustituís

Sustituís is the present indicative form of the Spanish verb sustituir used with the vos pronoun in the voseo variety of several Latin American regions. It means you substitute or you replace. This form corresponds to the second-person singular in informal address, and is common in Argentina and Uruguay, as well as some other areas where vos is spoken. In standard Peninsular and Latin American Spanish outside voseo regions, the corresponding form would be tú sustituyes or usted sustituye.

The verb sustituir comes from Latin substituere, meaning to place under or to substitute. In present tense conjugation, sustituir is regular for most forms, but in the vos form the ending changes to -ís, yielding sustituís. The typical present-tense paradigm in voseo contexts contrasts with the tú form, which is sustituyes, and with the usted/ellos forms, which align with sustituye and sustituyen.

Usage notes and examples: Sustituís is used in informal speech to indicate replacing something with another option. For example, “Sustituís las piezas viejas por las nuevas” means you replace the old parts with the new ones. In formal or regional contexts where tú is not used, you would encounter “usted sustituye” or “ustedes sustituyen” instead of sustituís. The meaning remains the same across forms: to replace, to substitute, to take the place of something else.

In summary, sustituir conjugated as sustituyere in vos form becomes sustituís, a hallmark of the voseo dialects, signaling an informal second-person singular action of substitution.