is that her counsin 的复数形式

is that her counsin 的复数形式 Is that her English book?复数形式 Is that her cousin?复数形式 that is her parent.(改为复数形式） her的复数形式 That is his brother的复数形式 Is that a photo?的复数形式 Is that his uncle的复数形式 that的复数形式 1.This is an orange.（改为复数形式） 2.That is her cup . 1.Is that her picture?(改为复数形式)2.He is in today.(同义句转换) her的复数形式是什么