是谁干的

who did it

→ 是
phrase Rare #15,493
who did it Used to ask who is responsible for an action or result.
CH: 是谁干的?
EN: Who did it?

但是我知道是谁干的

But I know who did it.

— 神秘河 (2003)

是谁干的?

Who did it?

— 蓝白红三部曲之蓝 (1993)

我不管是谁干的

I don't care who did it.

— 上帝之城 (2002)

他当然没有帮个忙明天之前查出来是谁干的中午之前马奇

Of course he didn’t help at all. Find out who did it by tomorrow—by noon, Maggie.

— 这个杀手不太冷 (1994)

我完全知道是谁干的。

I know exactly who did it.