the question was too hard to answer

题目

the question was too hard to answer
为什么不能说
the question was too hard to be answered

答案

这是Too···to···结构中“动词不定式的逻辑主语”的一种情况：动词不定式所发出的动作,其执行者与整个句子的主语不同指一个人或物时,需要在动词不定式前加上一个逻辑主语(for sb.).例如：The maths problem is ...