no sé a quién

I don't know who

→ no

phrase Uncommon #16,108

I don't know who Used before a verb or infinitive when saying that you do not know which person is involved, who to ask, whom to choose, or whom to dismiss. The phrase may change with the subject or tense, such as no sabemos a quién or no sabía a quién.

SP: No sé a quién llamar.

EN: I don't know who to call.

Lo entiendo ahora, aunque no sé a quién busca.

I understand it now, although I don't know who he is looking for.

— El imperio de las sombras (2016)

No sé a quién debo dirigirme.

I don't know who I should contact.

Y yo ya no sé a quién más pedir ayuda.

And I don't know who else to ask for help.

— El orfanato (2007)

Yo no sé a quién habrás salido.

I don't know who you take after.