estudiasteis

Estudiasteis is a form sometimes heard in Spanish as the second-person plural preterite of the verb estudiar. In standard Spanish, the normative preterite for vosotros is estu-dasteis, not estudiasteis, so estudiasteis is generally described as nonstandard or a common error in many dialects.

Formation and usage: estudiar is a regular -ar verb. In the pretérito perfecto simple, the vosotros form is formed by attaching the ending -asteis to the stem, yielding estudasteis. The spelling with an -i- (estudiasteis) is not alignment with the standard stem, and it is not accepted in formal writing or prescriptive grammar guides. The form is sometimes heard in colloquial speech but is not the recommended form in most teaching materials.

Regional and register notes: The vosotros forms are primarily used in Spain and in some parts of the Caribbean, with ustedes serving as the standard plural second-person in Latin America. When used with ustedes, the past tense is estudiaron. Because estudiasteis deviates from the standard vosotros preterite, it is often noted as a regional variant or a common error rather than a widely accepted form.

Examples:

- Correct standard: ¿Qué estudasteis ayer?

- Nonstandard variant: ¿Qué estudiasteis ayer? (colloquial or regional usage; generally avoided in formal contexts)

Related forms include present estudias, imperfect estudiabais, and other tenses of estudiar. The term highlights how spellings can reflect differences between prescriptive norms and actual spoken usage in various Spanish-speaking communities.