no conocía a

didn't know

→ no
phrase Uncommon #20,874
didn't know Used with a person or people. The personal a comes before a direct object referring to a specific person or people; conocía is the imperfect form of conocer.
SP: No conocía a tu hermano.
EN: I didn't know your brother.

Tom no conocía a ninguna persona de la sala.

Tom didn't know anyone in the room.

No conocía a todos en la habitación.

I didn’t know everyone in the room.

No era el único que no conocía a Tom.

I wasn't the only one who didn't know Tom.

Tom le mintió a María cuando dijo que no conocía a John.

Tom lied to María when he said he didn't know John.

Tom no conocía a Mary.

Tom didn’t know Mary.

No conocía a la intérprete, y por fin la encontré.

I didn’t know the interpreter, and I finally found her.

Tom mintió a Mary al decirle que no conocía a John.

Tom lied to Mary by telling her he didn't know John.

El año pasado yo no conocía a Tom.

Last year, I didn’t know Tom.

No conocía a ninguno de los presentes.

I didn't know any of the people there.

Masha no conocía a sus padres.

Masha didn't know her parents.

No conocía a la chica.

I didn't know the girl.

Casi no conocía a Vanessa, y a la otra menos, sólo conocía a Bosco.

I barely knew Vanessa, and even less the other one; I only knew Bosco.

— Tesis (1996)

Lo que me sorprendió fue que Tom no conocía a María.

What surprised me was that Tom didn’t know Maria.

No era la única que no conocía a Tom.

She wasn't the only one who didn't know Tom.

Ramadhir no conocía a Sardar como el hijo de Shahid.

Ramadhir did not know Sardar as Shahid's son.

— Gangs of Wasseypur. Parte 1 (2012)

Tom aseguraba que no conocía a Mary.

Tom insisted that he didn't know Mary.