мы не знаем, кто

we don't know who

→ мы
phrase Rare #44,062
we don't know who Introduces an indirect question about a person; the clause that follows specifies what is unknown.
RU: Мы не знаем, кто это сделал.
EN: We don't know who did it.

Мы не знаем, кто всех пригласил.

We don't know who invited everyone.

Мы не знаем, кто рассказчик.

We don’t know who the narrator is.

Будто мы не знаем, кто она такая.

As if we don't know who she is.

— Малена (2000)

И самое интересное, что мы не знаем, кто радуется.

And the most interesting thing is that we don't know who's happy.

— Анатомия падения (2023)

Мы не знаем, кто он.

We don't know who he is.