0 used to ask which person sth or sb belongs to or is connected with -- à qui
1 used to ask which person sth or sb belongs to or is connected with -- à qui
Whose is that car? A qui est cette voiture ?
2 indicates that sb or sth belongs to or is connected with sb -- dont
3 belonging to which person(?) -- à qui, de qui
4 of whom or which (the) -- dont, à qui