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问题: It is fooish of me to think like that.为何不能把of改成for?

解答:

判断用of 还是用for 其实有个巧妙的办法。你把上句拆成两句。即:I'm foolish. I think like that.拆下来以后,如果第一局说得通的,那么就用of 如果说不通,那么就用for. 例如:it is necessary for us to do the work. 拆开后:we are necessary. we do the work 显然:第一句:we are necessary.是不通的,所以用for。
其实这里关系到不定式的结构问题,如果你上面的看不懂,告诉我一下,我把真正的道理补充进去