按要求改写句子。
(1)What's this? It's a bus.(改为复数形式)
(2)There is some milk in the glass.(改为一般疑问句)
(3)Do it like that.(改为否定句)
(4)He saw elephants yesterday.(改为一般疑问句)
(5)She does her homework at 7:00.(改为否定句)