The Spanish Indefinite Articles
Un, Una, Unos, Unas
All nouns in Spanish have a specific gender. They could either be masculine or feminine. Typically, nouns ending in -o are masculine, such as libro (book) and muchacho (boy).
Nouns ending in -a are typically feminine, such as mesa (table) and muchacha (girl). In Spanish, there are four indefinite articles: un, una, unos, and unas. Un and una are used with masculine nouns and feminine nouns respectively. For example, un muchacho (a boy) and una muchacha (a girl).
Unos and unas are used with masculine-plural (more than one), and feminine plural (more than one) respectively. For example, unos muchachos (some boys) and unas muchachas (some girls).
Some Irregular Cases
Listen to this audio clip to check your answers. Repeat after me to practice your pronunciation.