Questions & Answers about ¿Conoces a alguien que viva cerca y sea puntual los sábados?
That “a” is the personal “a”, used before a direct object that is a person (or beloved pets, etc.).
- Conoces a alguien… = Do you know someone…
- Without a person: Conoces este lugar = Do you know this place.
In Spanish, when the direct object is a specific or potential person, you usually add a:
- Veo a María. – I see María.
- Busco a un doctor. – I’m looking for a (human) doctor.
Here, alguien is a person, so you must say a alguien.