1. Their child has got many toys
2. Our uncle has got two new cars
3.This boy has got five big balloons
4. His aunt has got four children
5. Her sister has got six apples
6. My brother has got beautiful pictures
7. Their cousine has got good computers
8. This girl has got nice rubbers
9. He has got a piano
Насколько я поняла, нужно сделать все предлодения в единственном числе 3 лица, то есть he, she, it. Ставишь и меняешь have на has + дополнительные слова, например these(эти) меняешь на this(это, этот, эта)