Who's the boy______the blue coat?

Who's the boy______the blue coat? Who's the lady___ blue? Who is the boy in blue coat[Tom]是什么意思 The man in a blue coat is Gao Shan's uncle.对"in a blue coat" Who’s the lady (C) blue Who's the lady in blue who's in blue Who’s the girl（ ）a red coat? who's the boy in blue?为什么要用in Blue who's and whose, Laura's coat is blue,and Betty's coat is blue,too同义句 Blue who show and who's.