This dress is mine改复数句

This dress is mine改复数句 is this your dress?改为复数句 This dress is pretty.(改为复数句) This is my dress.改成复数句. How much is this dress?(改为复数句） this is my knife改复数句 This red dress is mine,that green dress is__(she) This coat is mine.(复数句式) This is my shirt.改为复数句怎么改 is,this,adOII?改为复数句,怎么改? is this a boy or a girl改复数句 改句 whose story book is this?(复数）