It is adj. for sb. to do sth. 和It is adj. of sb. to do sth. 改成实际主语在前的句子怎样改？

It is adj. for sb. to do sth. 和It is adj. of sb. to do sth. 改成实际主语在前的句子怎样改？

to do sth is adj. for sb.

sb is adj. to do sth.