no sé a quién

I don't know who

→ no
phrase Uncommon #15,969
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.

No sé a quién busca.

I don't know who he/she is looking for.

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 quieres ver.

I don't know who you want to see.

Yo no sé a quién despedir.

I don't know whom to fire.

No sé a quién debo dirigirme.

I don't know who I should contact.

Aún no sé a quién debería elegir.

I still don't know who I should choose.

Mire, no sé a quién está buscando, pero le juro que no está aquí.

Look, I don't know who you're looking for, but I swear he's not here.

— Durante la tormenta (2018)

No sé a quién acudir.

I don't know who to turn to.

No sé a quién pillaron.

I don't know who they caught.

— Reservoir Dogs (1992)

No sé a quién debería preguntarle.

I don't know who I should ask.

No sé a quién voy a elegir.

I don't know who I'm going to choose.

Yo no sé a quién habrás salido.

I don't know who you take after.

— Dolor y gloria (2019)

No sé a quién elegir.

I don't know who to choose.

Y yo ya no sé a quién más pedir ayuda.

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

— El orfanato (2007)