be good for 对于……来说是好事
例句：Anyway,the news seems to be good for you.
无论如何,这个消息对你来说是个好事.
be good at:擅长做…
例句：Kids really have to be good at thinking on their feet.
所以孩子们真的是必须擅长独立思考问题.
be good to:对…好
例句：Why can't she be good to her sister?
为什么她不能对她姐姐好点?
be good with:擅长
例句：I think she can be good with Alice.
我想她可以和爱丽丝相处的融洽.
As a politician,you need to be good with words.
作为一名政治家,你必须能说会道.