estuvieses

Estuvieses is the second-person singular form of the imperfect subjunctive of the Spanish verb estar, produced with the -se variant of the subjunctive endings. It corresponds to tú estuvieses and is used in subordinate clauses to express hypothetical, uncertain, or non-real past conditions.

In Spanish, the imperfect subjunctive has two parallel conjugation patterns. The -ra form yields estuviera, estuvieras, estuviera, estuviéramos, estuvierais, estuvieran; the -se form yields estuviese, estuvieses, estuviese, estuviésemos, estuvieseis, estuviesen. Estuvieses belongs to the -se pattern and is a valid alternative to the -ra forms in many dialects and registers, though the latter often appears more frequently in neutral or formal writing.

Usage notes emphasize regional and stylistic variation. In many varieties, tú form is more commonly expressed with estuvieras or estuvieses, while estuviésemos or estuvieseis may appear in other person forms. The choice between -ra and -se forms can reflect dialect, formality, and historical preference.

Examples:

- Si tú estuvieses aquí, podríamos empezar la reunión.

- No creí que tú estuvieses tan cansado.

See also: estar, imperfect subjunctive, estuviese, estuvieras.