It is +形容词+of sb to do sth
It is +形容词+ for sb to do sth. 表示重要、必要、困难、方便、可能
It is important（necessary，difficult，convenient， possible）for sb．to do sth．
It is important for everyone to learn English well in our rapidly developing world.
It is very important for us to learn computer well, because it has changed our life so much.
Furthermore , it is convenient for us to travel around.
It’s very nice of you to offer me a seat. = You are nice to offer me a seat. 十分感谢你给我让座。
