"algunas" is formed with "algun+a+s"
where the "a" is the feminine and the "s" is plural.
Algun means "some": algun pais: some country, algun amigo: some friend
so algunas means some for femininine plural: some parties.
party, Fiesta is feminine in spanish, so you need a feminine version of algun.
and the sentence means: some parties are celebrated in the house (casa not case!) of the family
well, in this context, fiesta can also be a "celebration" or "holiday", not only a party
so it means "some unspecified ones"
<span>The complete question includes the choices: A. They make their films in English B.They film internationally. C. They present their work at film festivals. D. They use only Spanish actors. The first three alternatives are all good answers, if not the correct ones: A) English is a global language therefore all English speakers are included in the marketable audience, B) and C) are efficient ways to gain worldwide exposure.</span>
