Yo no creo que su opinión sea obvia.

Questions & Answers about Yo no creo que su opinión sea obvia.

Why is the verb sea used here instead of es?
Because the sentence starts with no creo que (I do not believe that). In Spanish, expressing disbelief or doubt with a negative phrase like no creer que or no pensar que triggers the subjunctive mood. That is why we use sea, the subjunctive form of ser, instead of the normal indicative form es.
How would this sentence change if I wanted to say 'I believe that his opinion is obvious'?
If you make the sentence affirmative (Yo creo que...), you are declaring what you consider to be a fact. Affirmative statements with verbs like creer or pensar take the indicative mood. The sentence would become: Yo creo que su opinión es obvia.
Why do we use the verb ser (here as sea) instead of estar?
We use ser because being obvious is treated as a defining characteristic or inherent quality of the opinion. We use estar for temporary states, conditions, or locations, but describing what a concept or opinion fundamentally is requires ser.
Why does the word obvia end in an 'a'?
Adjectives always have to match the gender of the noun they describe. The noun here is opinión. In Spanish, almost all nouns ending in -ión are feminine. Because opinión is feminine, the adjective obvio must change to its feminine form, obvia.
The English translation says 'his opinion', but doesn't su have other meanings?
Yes! The word su is a very flexible possessive adjective that can mean his, her, your (formal singular or plural), its, or their. Without extra context, su opinión could mean any of those. We only know it means 'his' in this specific example because of the English translation provided.

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