1/ These are brown boxes.
2/ These are the girls' watches.
3/ They have got children.
4/ What colour are the men's shirts?
5/ My cousins are doctors.
2/ This is their card. This card is theirs.
3/ That is her dog. That dog is hers.
4/ These are their trainers. These trainers are theirs.
5/ That is his family tree. That family tree is his.
6/ This is my room. This room is mine.