急初中英语题!高手来回答一下!为什么It's silly of you to do so 的of不能改成for ?

急初中英语题!高手来回答一下!为什么It's silly of you to do so 的of不能改成for ? it's nice of you to do that.that可以改成so吗 be silly to do sth.= It's silly of sb.to do sth.还要例句的 It's really nice of you to say so.中文意思?为什么用of不用for? I think it's silly of you not to forgive others for their mi It's nice of you to do that 为什么用of 而不用for let me help you with maths?B It's kind of you to do so for m It's very clever of you to do that.句中为什么用of,用for不行吗? 1.It's____(silly)of you to spend so much money on clothes 用英语回答“Do you think it's good for students to eat a lot of ha It is wrong of/for you to do so.这句话用of还是for?为什么?还有英语中哪些词应该是修 sometimes it is silly of you not to forgive others for their