estuvierais

Estuvierais is the second-person plural imperfect subjunctive form of the verb estar in Spanish. It is used in subordinate clauses to express hypothetical, uncertain, or counterfactual situations in the past, typically when the sentence includes the pronoun vosotros.

Formally, estuvi erais is built from the irregular preterite stem estu v- plus the imperfect subjunctive ending -ierais. This makes the form irregular in its stem but standard in its morphology within the vosotros paradigm of the imperfect subjunctive.

Usage and regional variation: The form is most commonly found in peninsular Spanish and in literary or formal contexts where the vosotros form is regular. In many modern varieties that do not use vosotros or that prefer ustedes, speakers are more likely to use bound equivalents such as estuvieron or estuvieran in corresponding contexts (for ustedes), while vosotros forms like estuvierais remain a marker of regional or formal register. Observers of contemporary speech may encounter estuviierais primarily in written texts, older literature, or carefully constructed speech.

Examples:

- Si vosotros estuvierais atentos, no cometeríais ese error. (If you all were attentive, you would not make that mistake.)

- Aunque vosotros estuvierais cansados, tendríais que terminar el informe. (Even if you all were tired, you would have to finish the report.)

Related forms include the other imperfect subjunctive endings for estar (estuvieras, estuviera, estuviéramos, estuvierais, estuvieran) and the corresponding indicative and conditional forms. The form estu vierais serves as a marker of the second-person plural in past-subjunctive constructions.