The playing.
¿Quién juega?Who plays?
(he/she/it) plays (you, formal) play
you play sport
"De quien" means from who?; "De quien(?)-whose(?)";
Quien duerme = who is sleeping?
quien soy means who am i....
"De quien" means "from whom"
no
Con quien means "with whom"
A girl is playing on the swing.
"Who was there?"
Whose.