请写出下列句子的同义句：1.This is my camera2.Are those their calculators

这些练习的都是名词性物主代词和形容词性物主代词之间的转换
1 This camera is mine.（mine=my camera）
2 Are those calculators theirs?（theirs= their caculators）
3 Is that her diary?（hers=her diary）