what's behind the door 语法结构

what's behind the door 语法结构 -What is behind the door? What _________ behind the door now?(hang) What's behind the door?It's a football.这句话哪里错了 There’s somebody()behind the door. The umbrella behind the door is kitty's(划线的是behind the door) the door is open是什么语法结构 There is a trash bin behind the door.（就画线部分提问） What's in you What's the story behind the expression? The umbrella behind the door is Tom一撇s.（划线部分提问,behind the do 对话配对what's behind the Mile is behind the door对behind the door提问