划线提问,1:A triangle has (three) sides.2:This biscuit is (a cir

划线提问,1:A triangle has (three) sides.2:This biscuit is (a circle).3:We have some small circle.
3:We have some small circle.(改为一般疑问句,并作否定回答）
4：Is this house big or beautiful?(改为复数句）谢谢.