in the statement "ayer fue un dia bueno para nosotros" is the preterite in the ir sense or in the ser sense. explain how you know.
In the statement "ayer fue un dia bueno para nosotros," the preterite verb is "fue." However, "fue" does not belong to either the ir or ser verb senses; it is specifically the preterite form of the verb "ser" (to be) in the third-person singular form.
We know this because the verb "ser" (to be) is irregular and has different forms for each tense. In the present tense, the first and third-person singular forms are "soy" and "es," respectively. But in the preterite tense, the form changes to "fui" for the first-person singular, "fuiste" for the second-person singular, "fue" for the third-person singular, and so on.
In this case, "fue" is used to indicate that "un día bueno" (a good day) "was" or "became" something, highlighting that it happened in the past.