There are （sixteen）boys in the room.（对括号部分提问）
问题描述：
There are （sixteen）boys in the room.（对括号部分提问）
There are eleven numbers on the blackboard.（改为一般疑问句）
There are （fifteen desks）in the classroom.（对括号部分提问）
There is a blackboard on the wall.（变为否定句）
答
How are boys are there in the room?
Are there eleven numbers on the blackboard?
What are there in the classroom?
There isn't a blackboard on the wall.