There is a ball on it.能否改为It's a ball on it.

There is a ball on it.能否改为It's a ball on it.
There is a ball on it.能否改为It's a ball on it.

There is a ball on it.能否改为It's a ball on it.
两句话的表达意思不同.首句There is 为 “There + be + ...”句式表示“有...”,而“It is ”则表示“这是...”强调事物的种类.

不行吧！