Questions: Qui, qui est-ce qui = Who ?

In cases when you ask who does something, there are two ways in French:

Who ... ?

C'est qui?Who's that? 

Qui vient manger?Who's coming to eat?

Qui fait ça?Who is doing that?
 

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?
 


ATTENTION: 

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 Questions: Qui / qui est-ce que = Whom ?

 

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Examples and resources

Qui fait ça?Who is doing that?
Qui est-ce qui fait ça?Who is doing that?
Qui te rejoint tous les matins?Who meets you every morning?
C'est qui qui vient manger?Who's coming to eat?
Qui vient manger?Who's coming to eat?
Qui est-ce qui vient manger?Who's coming to eat?
C'est qui?Who's that? 
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