Question

she is singing改为否定句、一般疑问句、对singing进行提问？

Answer 1

否定句:She isn’t singing.
一般疑问句: Is she singing?
对singing 提问的特殊疑问句: What is she doing?

Answer 2

否定句：She isn't singing.
一般疑问句：Is she singing.
对singing提问：What is she doing?

Answer 3

否定句：She is not singing.
一般疑问句：Is she singing？
对singing提问：What is she doing？

Answer 4

否定句：She isn't singing.
一般疑问句：Is she singing?
对singing提问：
What is she doing?

Answer 5

否定句She is not singing
一般疑问句Is she singing?
提问：What is she doing?