68.It's impossible for him to finish the difficult task in s

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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

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?

68.It's impossible for him to finish the difficult task in s it's difficult for him to finish the work in half an hour.同义英语好的帮帮忙：it's impossible for him to finish it in two days think 引导的 I think it's impossible for him to finish it in te ——It's impossible for him to finish the work on time,__? It's impossible for ( )people to finish( )work in( )time. 填空：although it was very difficult for him to finish the task 英语反意疑问句I think it's impossible for him to finish it in ten m It's impossible for us to finish the work in three days. It's impossible for him to save the kids in the fire.but tha work me it's for to difficult finish the it's p____ for him to finish the work in a day because he is