Rules for using eres

Question

Why is it  eres (ballerina) And not eres una (ballerina)

Accepted Answer

Hola Chizara
In Spanish, when talking about professions, roles, or identities (like "ballerina"), the article "una" (or "un") is often omitted. So, "Eres bailarina" is correct, and you don't need to say "eres una bailarina" unless you're emphasizing that she's one among others or being specific about a particular instance.
For example:
Eres bailarina (You're a ballerina) – general statement about someone's profession or role.
Eres una bailarina talentosa (You're a talented ballerina) – here, "una" is used because you're adding a description.
In short, "eres" is used without the article when referring to professions or roles in a general sense.
Hasta pronto
Silvia