Questions & Answers about Mientras yo comía, el arco viejo fue demolido.
Why use fue demolido (with ser) instead of estaba demolido (with estar)?
In this sentence, fue demolido uses the verb ser to describe the actual event or action taking place: the arch was actively knocked down. If you used estaba demolido, it would use estar to describe the resulting state: the arch was already in a state of ruin, without focusing on the action of demolishing it.
Why is comía in the imperfect tense but fue is in the preterite tense?
comía (I was eating) sets the background scene as an ongoing, continuous action in the past. fue demolido is a specific, completed event that happened while that background action was taking place. This contrast between an ongoing background (imperfect) and a specific event (preterite) is very common in Spanish.
Why does demolido end in -o?
When forming the passive voice with ser, the past participle (demolido) acts like an adjective and must match the subject it describes in both gender and number. Because el arco is a singular masculine noun, it takes the masculine singular ending -o. If the sentence were about a house (la casa), it would be fue demolida.
Could I say el viejo arco instead of el arco viejo?