your question is very difficult 后为什么加to answer而不是to be answe

your question is very difficult 后为什么加to answer而不是to be answe it is difficult to answer this question.为什么在answer前面加to 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 I think it difficult to answer this question 为什么可以it 不加is? the question is difficult to answer What is the sky This question is very difficult to answer ,i 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 “It is difficult to answer that question” means _______ . The question is more difficult to answer _________.