I don't know
No conozco a Dorothée, pero me alegra que no cogiera usted la varicela.
I don't know Dorothée, but I'm glad you didn't catch chickenpox.
— La noche americana (1973)
I don’t know those people.
I don't know this lady.
Nunca subí a un helicóptero, no conozco a Obama, ni soy agente secreto.
I've never been on a helicopter, I don't know Obama, and I'm not a secret agent.
— Mañana empieza todo (2016)
No conozco a ninguna de las dos hermanas.
I don't know either of the two sisters.
I don't know that man.
No conozco a todos los estudiantes.
I don't know all the students.
I don't know that lady.