不能这么想,,如果你转不过弯,就换成陈述句,It is silly of you ____ that,他只是换成疑问句罢了
be silly of sb to do sth = sb be silly to do sth
某人做某事是够傻的。
这是个固定结构
如:
It is silly of you to ask such a question.
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doing是正在进行时,有个句型是it is+adj+of sb+to do sth
可以说是固定搭配。How +adj +of sb.+to do