Task 4
2. These are the girls' hats. They're their hats. These hats are theirs.
3. These are the boys' bicycles. They're their bicycles. These bicycles are theirs.
Task 5
1. It's Tom's camera.
2. They're Elisha's flowers.
3. It's Ben's ball.
4. They're Youssef's cars.
5. It's Jenny's ice cream.
6. They're Isabel's books.