Ayer, el hombre inventó el rumor sobre el ovni.

Questions & Answers about Ayer, el hombre inventó el rumor sobre el ovni.

This lesson is about doubt and the subjunctive. Why isn't the subjunctive used in this sentence?
Because this sentence is stating a simple fact in the past, not expressing doubt. There is no trigger phrase here like dudo que (I doubt that) or no creo que (I don't believe that). If you wanted to express doubt about this event, you would need a trigger, which would force the verb into the past subjunctive (a tense you'll learn later!). Since this is just a factual statement, it simply uses the regular past tense (inventó).
Is ovni a regular word, or is it an abbreviation like UFO in English?
It started as an acronym but is now treated as a regular noun! Just like UFO stands for Unidentified Flying Object, ovni stands for Objeto Volador No Identificado. Because it acts like a normal noun, it is written in lowercase letters and even has a plural form: los ovnis.
Why do we use the preterite inventó here instead of the imperfect inventaba?
The word Ayer (yesterday) gives us a specific, completed timeframe. The preterite tense (inventó) is used for actions that were completed in the past. If you used the imperfect (inventaba), it would sound like he was in the middle of inventing the rumor or used to invent it over an ongoing period, which clashes with the specific, completed time marker yesterday.
Could I use de instead of sobre to say the rumor about the UFO?
Yes, you absolutely can. Both el rumor sobre el ovni (the rumor about the UFO) and el rumor del ovni (the rumor of the UFO) are perfectly natural and mean the same thing in everyday Spanish. Sobre just slightly emphasizes the specific topic of the rumor.

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