Ответ:

  1. Has Laura got a camera? No, she hasn’t.
  2. Have Steve and Tony got cameras? Yes, they have. Their cameras aren’t old.
  3. Has Paul got a red football? Yes, he has, but it isn’t red. It is white.
  4. Laura and Steve haven’t got skateboards.
  5. Laura’s and Paul’s watches aren’t expensive.

Формы has/have got показывают наличие, а is/are используются для описания предметов.