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It is adj.of/for sb to do sth.

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It is adj.of/for sb to do sth.
it是形式主语 如果改成To do sth在前面的形式是怎么改还有否定句
还有 Sb be adj.enough to do sth也是同样的问题
总觉得这两个句字形式上有些相近,一 般什么状况下后面是跟“to do ”呢
It is adj.of/for sb to do sth.
to help me,so good a man,you are.
you are so good to help me.
it is so good of you to help me.
you are good enough to help me.
后面成分较长时用to do
不好说明,只好举个例子了,不过最好还是向楼上说的,去问老师.