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 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?
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?

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?
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。