Iban a gritar con euforia cuando mostraran el diseño exclusivo.

Questions & Answers about Iban a gritar con euforia cuando mostraran el diseño exclusivo.

Why is mostraran in the imperfect subjunctive here instead of the indicative?
The subjunctive is triggered by cuando because the action of showing the design was still in the future relative to the past moment of iban a gritar. Just like you use the present subjunctive for future events after cuando (like "I will scream when they show..."), you shift back to the imperfect subjunctive for pending events in the past ("They were going to scream when they showed...").
The English translation says "when they showed", which is simple past. Why can't I just use the preterite mostraron?
If you used the indicative preterite (cuando mostraron), you would be stating a completed fact: they actually showed it, and the screaming happened right then. By using the imperfect subjunctive (cuando mostraran), you keep the action as an anticipated event in the past. We don't actually know from this sentence if the design was ever shown!
Could I use mostrasen instead of mostraran?
Yes, both are perfectly valid forms of the imperfect subjunctive. In Latin America, the -ra ending (mostraran) is much more common in spoken Spanish, but you will definitely encounter the -se ending in literature and formal writing.
Why use con euforia instead of an adverb like eufóricamente?
While eufóricamente is a valid word, Spanish often prefers using con + [noun] (literally "with euphoria") to describe how an action is performed. It sounds very natural to native speakers and is often favored over bulky -mente adverbs.

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