Ответ:
Переставляем слова, сохраняя нужные притяжательные формы и грамматический порядок.
- I went to the cinema with a friend of mine.
- Some friends of my parents went on holiday with theirs.
- Anna gave me her phone number.
- Whose books are these? Yours or mine?
- Kevin is going out with his friends this evening.
- Our neighbours have got 3 children, but I don't know their names.
- We took our car and they took theirs.
