the question is difficult to answer为什么不是to be answered

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the question is difficult to answer为什么不是to be answered
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the question is difficult to answer为什么不是to be answered
the question is difficult to answer
为什么不是to be answered

the question is difficult to answer为什么不是to be answered
the question is difficult (for me) to answer
所以这个句型不是被动句

前面已有be动词 is

固定用法
这里不需要用被动语态