Possessive pronoun must agree in gender and number with the noun in the phrase they replace. Each possessive pronoun must agree in gender (masculine or feminine) and number (singular or plural ...

Mine is there. Bola too has taken hers away. In the first clause, ‘mine’, a possessive pronoun, is standing in place of ‘my bag’ while ‘hers’ refers to ‘Bola’s bag’ in the second.