выяснить, кто это сделал

find out who did it

→ выяснить
phrase Rare #49,482
find out who did it An infinitive phrase meaning to determine the identity of the person who did something. The phrase кто это сделал literally means “who did it.”
RU: Полиция пытается выяснить, кто это сделал.
EN: The police are trying to find out who did it.