it is difficult to answer this question.为什么在answer前面加to

it is difficult to answer this question.为什么在answer前面加to I think it difficult to answer this question 为什么可以it 不加is? This question is too difficult for me to answer.为什么后面不要it呢? This question is very difficult to answer改为同义句 This question is very difficult to answer的同义句 this is a question difficult to answer对吗 i found ,difficult to answer this question “It is difficult to answer that question” means _______ . It is s_ of you to answer the difficult question. your question is very difficult 后为什么加to answer而不是to be answe I think it is difficult for me to answer this question(改为简单句 This question is difficult,I cannot answer it（用too.to结局 ）