ты даже не знаешь, кто

you don't even know who

→ ты
phrase Rare #50,298
you don't even know who Ты is the informal singular form of “you.” The sentence continues with the person or thing being asked about.
RU: Ты даже не знаешь, кто это сделал.
EN: You don't even know who did it.

Ты даже не знаешь, кто был этот человек.

You don't even know who that person was.

Ты даже не знаешь, кто твой отец.

You don't even know who your father is.

Ты даже не знаешь, кто тебе это прислал.

You don't even know who sent this to you.

Ты даже не знаешь, кто я.

You don't even know who I am.