In cases when you ask who does something, there are two ways in French.
Learn how to ask questions with "who" in French
1. Who ... ?
Qui vient manger?Who's coming to eat?
Qui fait ça?Who is doing that?
2. Qui est-ce qui ... ?
Qui means who but there is a longer form in which qui appears twice: qui est-ce qui ...? (literally: who is it who...).
Qui est-ce qui vient manger?Who's coming to eat?
Qui est-ce qui fait ça?Who is doing that?
You can also sometimes encounter the form c'est qui qui, however, this is NOT a grammatically correct form to use!
C'est qui qui vient manger?Who's coming to eat?
literally: It's who who is coming to eat?
See also Qui/Qui est-ce que ... ? = Whom ... ? (French Questions)
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