Meanings of the Spanish Word "Los"

"Los" is one of the most frequent words in Spanish, functioning as a masculine plural marker in several grammatical roles:

1. Masculine Plural Definite Article ("The")

Los árboles son verdes. – "The trees are green."

2. Masculine Plural Direct Object Pronoun ("Them")

Los vi ayer. – "I saw them yesterday." (referring to masculine plural nouns)

3. Masculine Plural Possessive Pronoun ("Theirs"/"Yours" formal)

Esta es su casa, y estos son los hijos. – "This is their house, and these are their children." (Here los implies "the [sons/children]" as a possessive construction.)

4. Masculine Plural Relative Pronoun ("Who/That")

Los muchachos que corren son de la escuela. – "The boys who are running are from the school." (Los muchachos = "The boys"; que is the relative pronoun.)

5. Contraction: para + lo (Rare/Archaic)

Standard contraction is pa'l (colloquial) for para el. Para + lo → palo is not standard. The example given ("por los cuales") uses por + los, not a contraction of para + lo.

Key: Context determines which function "los" serves. It always signals masculine plural.