Напишите по-английски.

1. Ivan's bike. 2. Ivan's and Anton's bike. 3. Lena's bike. 4. Lena's and Vera's bike. 5. Vera's and Lena's bike. 6. this boy's bike. 7. these boys' bike. 8. these girls' bike. 9. this girl's bike. 10. this child's bike. 11. these children's bike. 12. these twins' bike. 13. this sportsman's bike. 14. these sportsmen's bike.