What is the sky This question is very difficult to answer ,i

What is the sky This question is very difficult to answer ,i This question is very difficult to answer改为同义句 This question is very difficult to answer的同义句 to answer the question is very difficult改为同义句 the question is difficult to answer This question is very difficult.I can't answer it.This quest the question is very difficult no one can answer this question is very difficult ( ) this is a question difficult to answer对吗 It is very difficult to answer the question这句话对不对 it,very,to,question,answer,is,the,difficult连词成句 I think it is difficult for me to answer this question(改为简单句