Questions & Answers about No quiero ese; prefiero el primero.
Spanish demonstratives show distance:
- este = this one, near the speaker
- ese = that one, near the listener or a bit farther away
- aquel = that one over there, farther away from both
So No quiero ese means I don’t want that one. It refers to something already understood from context.
Here, primero is also being used like a noun phrase: the first one. In Spanish, ordinal numbers often need the definite article when they stand in for a noun.
- Prefiero el primero = I prefer the first one.
If you said only Prefiero primero, it would usually sound like I prefer first or I’d rather do something first, which is a different meaning.