问题描述：
there be句型肯定句,否定句,一般疑问句都有
问题解答：
我来补答
There is a book on the desk
There is not a book on the desk
Is there a book on the desk?
There are some cats in the tree.
There are not any cats in the tree
Are there any cats in the tree?
再问： 是一个句子里有肯定句、否定句、一般疑问句这三个句型。
再答： 不可能一个句子有三个句型
再问： 哦，谢谢，你还有句子吗？
再答： There is some water in the cup There is not any water in the cup Is there any water in the cup?
