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 librarythere 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〉

Is there a piano in the classroom?
No, there aren't.
There aren't any students in the library.
There are no students in the library.
How many basketballs are there in the box?

1.There is no a piano in the music 用 no 改为否定句 2.How do 10.There is a chairs in the classroom 改为单数 11.There are some

Is there a piano in the classroom?----No,there isn't.
There are no students in the library.
How many basketballs are there in the box.

Is there a piano in the classroom?
There aren't any students in the library.
How many basketball are there in the box?

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?