That is his brother的复数形式

That is his brother的复数形式 Is that his uncle的复数形式 that is his brother 改为复数句 This is my brother.改为一般疑问句 that is his photo.改为复数形式 this is his brother(改成复数形式） that is my sister（改成复数形式） those 1.This is his brother改复数形式 2.That is my sister.改复数形式 3.Those That is his brother变复述形式 that is his uncle 的复数形式是什么 is that his key (改为复数形式) that is his sister改为复数形式 Is that his class?怎么变成复数形式? 写出mather father this sister brother is 的复数形式.