your question is very difficult 后为什么加to answer而不是to be answered或answering

题目

your question is very difficult 后为什么加to answer而不是to be answered或answering

答案

to answer 是不定式作定语修饰question
语法规定：当不定式【to answer 】和所修饰的词【question】成动宾关系时,不定式主动形式表被动
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