Помогите сделать. Не догоняю. СРОЧНО!! 11 и 12

Номер 11: 2)This is their card.The card is theirs; 3)That is her dog. The dog is hers 4)These are their trainers. The trainers are theirs 5)That is their tree. The tree is theirs 6)This is my room. This room is mine