How happy the family it is!对吗,还是在末尾用they are How happy the family is/are!可以吗

题目

How happy the family it is!对吗,还是在末尾用they are How happy the family is/are!可以吗
How beautiful the dress it is!
How tall the buildings they are!

答案

应该是：How happy the family are!
How beautiful the dress is!
How tall the buildings are!