英语：按要求改句子.
1、That's my uncle.(改为一般疑问句）____________________
2、Are those your keys?(作否定回答）____________________
3、These are oranges.(改为单数句）_____________________
4、(Mrs.Brown) is forty.(对带划线\括号句子提问）____________
5、They're photos of my family.(改为否定句）_______________