The question is easy to answer可以用 为什么They are nowhere to be found要用被动呢?The question is easy to answer可以用 为什么They are nowhere to be found要用被动呢?有什么区别么?

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The question is easy to answer可以用 为什么They are nowhere to be found要用被动呢?
The question is easy to answer可以用   为什么They are nowhere to be found要用被动呢?有什么区别么? 

你问得到位,非常有质量.
1 The question is easy (sb.) to answer== It is easy (for sb,) to answer the question.
因为你的句子省略了括号里面的逻辑主语,并且完全可以省略.
2 They are nowhere to be found== They are nowhere for you / me to find
因为they是要被find的主体,做主语.如果用主动语态,必须写上for sb这样的结构.
明白了吗?祝你天天向上.

the question is easy to answer, the air is good to breathe,等此类是固定句型 名词+be+特定adj./n.+to do, to do主动表被动。后一句中nowhere不属于此类可以主动表被动的adj或noun