1. indefinite articles “a/an” and “some/few”

2. artículos indefinidosun
una
unos
unas
a/an
some/few

3. Use “un” before masculine singular nouns.
Use “una” before feminine singular nouns.
Use “unos” before masculine plural nouns.
Use “unas” before feminine plural nouns.

4. Use unos with a masculine plural noun
Use unos with a masculine plural noun. When referring to a group of people that includes both males and females, the masculine plural is used.
unos estudiantes

5. In a negative sentence: ¿Necesitas unos bolígrafos?
Un, una, unos, and unas are often dropped.
¿Necesitas unos bolígrafos?
No, no necesito bolígrafos.