The problem is easy to solve.为什么用to solve

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/11 10:16:32

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
再问：可是问题不是被解决吗，不就应该用to be solved吗，solved也可以表示被动，为什么不能用啊？
再答：我说了，此句型中的主语是不定式的逻辑宾语！！！你看： The problem is easy to solve. =It is easy to solve the problem.

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