what is the passage or the article to the question?
Answer:
El JUGO al futbol
Mi profesora de ciencias ERA muy simpatica
Yo EMPECE a jugar basketball el año pasado
When you're talking about nonspecific things.
it's like (a) and (an) in english.
uno is for singular masculine.
una is for singular feminine.
unos is for plural masculine.
unas is for plural feminine.
Yo pense que amarillo era el color yellow