There is a book and a pen on the desk.(变为否定句)
问题描述：
There is a book and a pen on the desk.(变为否定句)
答
There isn't a book and a pen on the desk.
答
为你解答。
There is a book and a pen on the desk.(变为否定句)
There isn't a book and a pen on the desk.
在书桌上没有一本书和一支钢笔。
答
There isn't a book or a pen on the desk.and在否定中要改成or.