Is the girl singing in the classroom？
肯定回答 Yes, she is.
否定回答 No,she isn't.
Is the girl singing in the classroom? No,she isn't.
the girl is singing in the classroom 女孩在教室里唱歌
the girl doesn't sing in the classroom 那女孩在教室里不唱歌
肯定回答yes she is，不肯定回答，No she isn't
Is the girl singing in the classroom?
Yes, she is.
No, she isn’t.
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