The girl in red is my cousin.
一般疑问:Is the girl in red your cousin?
否定回答:No, she isn't.
The keys on the sofa are Jane's.
一般疑问:Are the keys on the sofa Jane's?
否定回答:No, they aren't.
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Is your girl in red your course ?no,she isn't !
Is the girl in red your cousin? No,she isn't.
Are the keys on the sofa jane's? No,they aren't.