1 Volvieron antes que su padre (sustantivo) Volvieron antes de las 12 / antes del medio dia (tiempo) 2 Antes de ir-te dame un abrazo (infinitivo) Antes de que te vayas, dame un abazo (subjuntivo presente) 3 En la fila hay 5 personas antes que yo (pronombre personal) En la fila hay 5 personas antes de mi (pronombre de objeto directo)

I am not a linguist but as a Spanish speaker and based on everyday usage, I understand that "antes que" is used to precede a subject, and "antes de" is used to precede a situation or verb (an act).

Hola Richard Antes que is comparing an action between Mercedes y Enrique and her/his father, between two or more nouns For instance: lávate las manos antes que tu hermano Antes de indicates one action goes before another one. For instance: lávate las manos antes de comer. Anyway you can find as well antes de que, and there is a kind of argument if that is correct or not, but it is at the moment, and many people say it. In this case it comes with subjutive, Come algo antes de que te vayas. I am sure there will be a good explanation from a teacher soon.

Antes de = "before (something)" en inglés Por exemple: Te llamare ANTES DE el mediodia = I will call you before (the) noon. Antes que = "rather than" en inglés Por exemple: En inglés, decimos "I have a red apple every morning" ANTES QUE "I have an apple red every morning. = In English, we say "I have a red apple every morning" rather than "I have an apple red every morning."