1.Are they countries?
2.Do they walk to school every day?
3.They are new coats.
解题方法（纯属个人经验、、）：如果说一般疑问句不好改的话 就先把一般疑问句变为肯定句再改、
例：Is there a person?变为 There is a person.改为复数 There are many people .这样就出来啦 Are there many people?此题应注意要把person 变为people.