Is your pen red?-------NO()()

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Is your pen red?-------NO()()

Is your pen red?-------NO()()
Is your pen red?-------NO()()

Is your pen red?-------NO()()
--Is your pen red?
--No,(it)(isn't).
你的钢笔是红色的吗?不是的.

你好,可以填:
it isn't .

it's black.

这是一般现在时的否定形式
有be 的时候对be进行否定
所以填 it isn't