将Is this that twin sister's photo改为复数形式怎么改?

将Is this that twin sister's photo改为复数形式怎么改? is that your sister改为复数形式,怎么改? This is his sister and that,s his son.怎么改为复数形式 帮忙改英语句子将句子改为复数形式1 this is Anna's consin.2 That is his parent This is his sister and that is his son.怎么改为复数形式 This is my brother.改为一般疑问句 that is his photo.改为复数形式 This is my sister.改为复数形式、 This is your sister.改为复数形式 That is my sister改为复数形式 that is his sister改为复数形式 把下列句子改为复数形式 This is my key That is your photo He 1.This is his brother改复数形式 2.That is my sister.改复数形式 3.Those