La fachada de la catedral fue diseñada por el arquitecto.

Questions & Answers about La fachada de la catedral fue diseñada por el arquitecto.

Why does this sentence use fue (from ser) instead of a form of estar?
This sentence uses the passive voice to focus on an action happening to the subject. To say an action was done by someone, you must use ser. If you used a form of estar like estuvo, it would describe a physical state or condition rather than the actual event of the architect designing it.
Why does diseñada end in -a? Do past participles change endings?
In perfect tenses with haber (like ha diseñado), the past participle always ends in -o. However, in the passive voice with ser, the past participle acts like an adjective. It must match the subject in gender and number. Because the subject receiving the action is la fachada (feminine singular), the participle becomes diseñada.
Why is the preterite fue used here instead of the imperfect era?
We use the preterite fue because the design of the facade is viewed as a single, completed event in the past. If you used the imperfect era diseñada, it would change the meaning to an ongoing background action, translating more closely to saying the facade was being designed over a period of time.
Could I use para instead of por to mean 'by'?
No, you must use por. In passive voice sentences, por is the specific preposition used to introduce the agent, which is the person or thing performing the action. If you said para el arquitecto, it would mean the facade was designed for the architect to use, not designed by him.

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