按要求改写句子。
I have a pear. (改为一般疑问句)
                           have a pear?
I have some grapes. (改为一般疑问句)
             you have              grapes?
This is a mango. (改为复数句)
             are             .
I have some oranges. (改为单数句子)
I have                          .
I have three eggs. (对划线部分提问)
                       eggs do you have?