there is a piano in the classroom(改为一般疑问句并作否定回答there are some students in the library

问题描述:

there is a piano in the classroom(改为一般疑问句并作否定回答there are some students in the library
there is a piano in the classroom(改为一般疑问句并作否定回答〕there are some students in the library〔改为否定句〕there are —four— basketballs in the box〔对划线部分提问〉

补充一楼第一题!
1.Is there a piano in the classroom?
No,there isn't.
2.There aren't any students in the library.
3.How many basketballs are there in the box?