for (of通常用于描述内在品质,如It's so good of you to help me.=You are so good to help me.
for指某一具体行为对人的影响.It's good for you to drink some milk every day.=To drink some milk every day is good for you.)it is good ________ you to becrazy about english!选for,指对英语疯狂这种行为对你有好处.