creísteis

Creísteis is the second-person plural imperfect indicative form of the Spanish verb creer. The verb creer means to believe, to think, or to suppose. Therefore, creísteis translates to "you all believed," "you all thought," or "you all supposed" in English. This form is used when referring to a past action or state that was ongoing or habitual in the past, and is being spoken to or about a group of people addressed with the informal "vosotros" form.

The imperfect tense in Spanish is used to describe past actions that were not necessarily completed, or to set the scene for another past event. It can also be used to describe habitual actions or states in the past. For example, "Vosotros creísteis que era una buena idea" translates to "You all believed it was a good idea," implying a past belief that might have persisted. Another example could be "Cuando éramos niños, creísteis que los Reyes Magos existían," meaning "When we were children, you all believed that the Three Wise Men existed," indicating a past, ongoing belief.

The use of creísteis specifically indicates that the subject of the verb is "vosotros," which is the informal plural "you" used primarily in Spain. In many Latin American countries, the equivalent form would be "ustedes creían." Thus, encountering creísteis in a text points to a Spanish linguistic context where the informal plural address is common.