there is a book 改成否定句

there is a book 改成否定句 There is a book on the desk(改成否定句和一般疑问句） Jenny is reading a picture book. 改成否定句! 谢谢 There is a book on the desk.(改为否定句) There is a map on the wall .改成否定句 there is a pear in the basket.改成否定句 there is a storybook on the desk改成否定句 there is a knife on the tin.改成否定句 there is a computer in my bedroom.改成否定句 There is an Eaglish book on my desk改成否定句 There's a picture book in this photo 怎么改成否定句 There is a book and a pen on the desk.(变为否定句)