The girl is singing in the classroom (改为否定句和一般疑问句）
问题描述：
The girl is singing in the classroom (改为否定句和一般疑问句）
答
The girl is not singing in the classroom.
Is the girl singing in the classroom?
答
否定句 The girl isn't singing in the classroom
一般疑问句 Is the girl singing in the classroom?
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