The problem is easy to solve.为什么用to solveThe problem is easy (to solve).这句话里用的是to solve,为什么不能用to be solved或者直接用solved?

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The problem is easy to solve.为什么用to solve
The problem is easy (to solve).
这句话里用的是to solve,为什么不能用to be solved或者直接用solved?

这是个固定句型
主语+ be+ 形容词+ to do(主动式,因为句子的主语是不定式的逻辑宾语)
再如:
The question is easy to answer
The sentence is difficult to translate.
The apple is good to eat.
The math problem is easy to work out
请在客户端右上角评价点“满意”即可

to solve:来解决;to be solved:要解决;solved:解决了。The problem is easy to solve:很容易解决的问题。to be solved,是将来进行;solved:过去式。所以目前所发生的,只能够选择to solve。