Question

there is a book on the desk否定句

Answer 1

句子中有be动词变，否定句时直接在be动词后加not

There isn't a book on the desk.

Answer 2

There is a book on the desk.否定句
There is not a book on the desk.

Answer 3

there is not a book on the desk.

Answer 4

There is no book on the desk.

Answer 5

这句话的否定句是：there isn't a book on the desk.