be good 后接for可表示“有益的，合适的”，后接to可表示“对友善的”，后接at可表示“精通的，熟练的”。It's good of sb 和It's good for sb 都可接to do sth，但含义不同。前者重在“人”很好，后者重在“事”很好。
be good的用法整理
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。
be good at的例句
1、A good listener must be good at asking questions.一个好的聆听者应该善于问问题.
2、Be good at harmonize social relationship between all departments, strong ability in communication.擅长协调部分之间人际关系,具有很强的沟通能力.
3、I expect to study in the US one day. Before that day coming, I must be good at English.我期望有天能到美国念书在那天到来之前我必须先将我的英文学好!
4、You could study astronomy, or space engineering, and be good at it.你可以学习天文学,或是空间工程学,可以学的很棒.
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