who is that
Der Junge, der dort schwimmt, wer ist das?
Who is the boy swimming over there?
Jedes Mal, wenn ich dich anrief, war eine Frau am Telefon, wer ist das?
Every time I called you, there was a woman on the phone, who is that?
— Das süße Leben (1960)
Who could that be?
Who’s that over there in the corner?