Is this your sister的复数句?

Is this your sister的复数句? IS this your sister?(改为复数句) IS this your sister?(改为复数句） This is your sister.改为复数形式 This is his sister改为复数句 This is my sister(变为复数句) This is my sister 改为复数句 Is this your sister?(改为复数句） Those are Zhang jie is aunts.(改为 is this your father?否定回答 that is his sister?复数句 (1)This is Gina's sister.改成复数句 (2)Are those your friends?(作肯 Is this your little sister's toy?Yes,it is的复数 把下列单数句变成复数句或复数句变为单数句 1 is that your sister?yes,she is.2 this