C1Lesson 1: Subjunctive in Complex Discourse
When Brazilian Portuguese speakers describe something they're looking for, need, or want but don't know if it exists or haven't found yet, they use the subjunctive mood in the adjective clause to signal this uncertainty or non-specificity.
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The fundamental distinction here is whether the thing you're describing actually exists in your mind as a specific entity or not. Think of it as the grammatical equivalent of the difference between "I'm looking for the person who called earlier" (specific, known) versus "I'm looking for a person who can help" (non-specific, unknown).
Use subjunctive in the adjective clause when:
You're searching for something/someone (but haven't found it)
You need/want something (but don't have it yet)
You're asking if something exists
You're denying existence
You're describing an ideal or hypothetical