it is+adj.+of sb+（not）to do与it is+adj.+for sb+（not）to do中of和

it is+adj.+of sb+（not）to do是说人的性格方面的 eg；It is kind of you to do this.it is+adj.+for sb+（not）to do做某事对某人来说是怎样的 eg；It is difficult for me to do this.