Spanish Indefinite Articles: un, una, unos, unas

Short answer

Un goes with masculine nouns, una with feminine; unos and unas mean some or a few. Spanish drops them before an unmodified profession: soy profesor, but soy un profesor excelente.

Level A1 · articles, nouns

The rule in full

A / an and some.

SingularPlural
Masculineununos
Feminineunaunas
  • un coche — a car
  • unas amigas — some friends

Omit the article with professions after ser, unless an adjective follows:

  • Soy profesor. (no article)
  • Soy un profesor excelente.

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