it is not a pen 否定句
一般疑问 is it a pen ? no it isn't
否定句是不能坐肯定回答的 必须得是疑问句才能回答 希望你说的更明白些
It isn't a pen.
Yes, it is.
Is it a pen? No, it isn't.
It isn't a pen.
Yes,it is
is It a pen?
no,it isn't
It isn't a pen .
——Yes,it is .
Is it a pen ?
——No it isn't.
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