1.There are some animals in Ocean Park.（改为否定句）

There animals in Ocean Park.

2.Mary has dinner with her grandparents.（改为反意疑问句）

Mary has dinner with her grandparents. .

3.These vegetables are very fresh.（改为感叹句）

 wegetables these are!

4.She is able to play the piano very well now.（保持句意不变）

She; the piano very well now.

5.hope,will, a , I,that, doctor, I, become（连词成句）