There are seven teachers in the office.（改成否定句）
问题描述：
There are seven teachers in the office.（改成否定句）
答
There aren't seven teachers in the office
答
there be的否定式通常在be后加not构成(在口语中be时常与not缩写在一起)
There aren't seven teachers in the office.
答
There aren't any teacher in the office.
答
There isn't any teacher in the office.