Imperfect Tense Conjugation Practice Test 2026 – Complete Exam Prep Guide

In the imperfect tense, we talk about past actions without marking their start or end. The verb ir is irregular in this tense, so its forms don’t follow a simple pattern. For the subject ellos/ellas/ustedes, the correct form is iban, which matches the plural third-person past “they were going” or “you all were going.”

The full irregular imperfect forms of ir are: iba, ibas, iba, íbamos, ibais, iban. So ibán corresponds to those plural subjects. An example: Ellos iban al parque todos los domingos cuando eran niños.

Other forms exist for the other subjects (iba for he/she/you formal, íbamos for we, ibais for you all informal, etc.), but none of those fit the plural third-person subject in this question.