пример: ( john/callo) whose is this callo? it^s johns/its his cello. : 1 (children/hats) 2 (children/bires) 3 (adam/ball)

1. Whose are these hats? It's children's hats.
2, Whose are these bikes? It's children's bikes.
3. Whose is this ball? It's Adam's ball.