Estudasteis

Estudasteis is the second-person plural form of the verb estudiar in the Spanish pretérito perfecto simple (also known as pretérito o pasado simple). It translates to "you all studied" or "you guys studied" in English. This form is characteristic of Spain and is used with the subject vosotros/vosotras.

Morphology and conjugation: Estudasteis is derived from the stem estud- plus the regular ending for -ar verbs in the pretérito for vosotros. It is a regular formation within the standard -ar verb conjugation pattern in this tense. The word carries no accent mark.

Usage and regional variation: The form is primarily used in Peninsular Spanish, where the pronoun vosotros is common for informal second-person plural. In most Latin American varieties, the vosotros form is not used; instead, speakers generally use ustedes, with the corresponding pretérito for ustedes being estudiaron. In written texts intended for a broad audience, vosotros forms are often avoided outside Spain to prevent ambiguity.

Examples:

- A ayer, vosotros estudasteis para el examen de historia.

- ¿Qué estudasteis ayer para la clase de biología?

Related forms and contrasts: Estudaste (tú estudiaste) and estudó (él/ella estudió) are the other singular forms in the pretérito for -ar verbs. Estudiaron (ellos/ellas estudiaron) is the third-person plural form, used in both Spain and Latin America. Estudiábamos (we studied/used to study) and estudiábamos (we were studying) illustrate related imperfect forms.