There are twelve months a year.（变成疑问句） —— ——twelve months in a year?
He has two balls under his bad.(用there be句型)
—— —— —— ——under his bed.
There is some milk in the bottle.（改为否定句）
___ ___ ___milk in the bottle.
There are _56_students in the classroom.(对划线部分提问）
—— ——students—— ——in the classroom?