1.即:of sb to do sth和for sb to do sth的区别. 2.关键是看of/for前面的形容词的特点,如果它是指sb的性格/品质/品德等,就用of,不是则用for. 如:It's kind of you to help me. It's important for you to learn English. 3.另外还有两个判定的方法: 如果该结构可以换写成sb be + 形容词 + to do sth,则用of,反之则用for. 如: 1)It's kind of you to help me. = You are kind to help me. 2)It's important for you to learn English. ≠ You are important to learn English.这句话错误.