68.It's impossible for him to finish the difficult task in such a short time.(改为反意疑问句)It's impossible for him to finish the difficult task in such a short time,________ _________ 知道是isn't it,为什么,impossible是否定呀,应该

68.It's impossible for him to finish the difficult task in such a short time.(改为反意疑问句)It's impossible for him to finish the difficult task in such a short time,________ _________ 知道是isn't it,为什么,impossible是否定呀,应该
68.It's impossible for him to finish the difficult task in such a short time.(改为反意疑问句)
It's impossible for him to finish the difficult task in such a short time,________ _________ 知道是isn't it,为什么,impossible是否定呀,应该用is

68.It's impossible for him to finish the difficult task in such a short time.(改为反意疑问句)It's impossible for him to finish the difficult task in such a short time,________ _________ 知道是isn't it,为什么,impossible是否定呀,应该
It's impossible for him to finish the difficult task in such a short time,________ _________ 知道是isn't it,为什么,impossible是否定呀,应该用is
否定前缀不是否定词!
类似的否定前缀不是否定词的.
un-; in-; dis-; im-; ir-
unable,invisible,disappear; impossible; irregular
否定词有几个：
not,never,hardly,scarcely,rarely,none,no,nothing,nobody,neither,seldom,little,few等
当句子中含有以上否定词时,才是否定句的.
又如:
He is unable to speak English,isn't he?

肯定要用isn't it.
impossible 没有否定的意思，你这是用汉语的习惯来理解英文。
如果你要理解它为‘不可能’, ‘不可能’这句汉语是有否定意思的，但如果理解为‘遥不可及’呢。
事实是，这个单词的否定语气是翻译成中文后才有的，原词没有否定的意思，只是中文没对应的词。...

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肯定要用isn't it.
impossible 没有否定的意思，你这是用汉语的习惯来理解英文。
如果你要理解它为‘不可能’, ‘不可能’这句汉语是有否定意思的，但如果理解为‘遥不可及’呢。
事实是，这个单词的否定语气是翻译成中文后才有的，原词没有否定的意思，只是中文没对应的词。

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