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

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? 
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?
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