区别：
1、be good at 意为“擅长……”，后接名词、代词或ving形式。
例如：I’m good at playing chess. 我擅长下象棋。
2、be good to意为“对……友好”。
例如：My friend was good to me when I was ill. 我生病时我的朋友对我关怀备至。
3、be good for意为 “对……有好处”。
例如：Eating more vegetables is good for your health. 多吃蔬菜对你的健康有好处。
扩展资料
例子
1、In fact, they might be good for the economy.
事实上，它们可能还对美国经济产生了有益的推动。
2、I was thinking it would be good for bob.
我原来一直认为这对鲍勃有好处。
3、Rain water was once considered to be good for the complexion
雨水曾一度被认为可以滋养皮肤。
4、But if you have a good method of learning, I think you will be good at it.
但是如果你有好的学习方法，我想你就会学会它。
5、I independence, because I be good at association with person.
我独立，因为我善于与人交往。
参考资料：百度百科：good
be good to / be good for
be good 后接不同的介词，表达的意思也不同。
1）be good at 意为“擅长……”，后接名词、代词或ving形式。例如：
I’m good at playing chess.
我擅长下象棋。
2）be good with意为“灵巧的；与……相处得好”。 例如：
She is good with her hands.
她手很巧。
He is very good with the children.
他与这些孩子处得很好。
3）be good to意为“对……友好”。 例如：
My friend was good to me when I was ill.
我生病时我的朋友对我关怀备至。
4）be good for意为 “对……有好处”。例如：
Eating more vegetables is good for your health.
多吃蔬菜对你的健康有好处。
区别：
1、be good at 意为“擅长??”，后接名词、代词或ving形式。
例如：I’m good at playing chess. 我擅长下象棋。
2、be good to意为“对??友好”。
例如：My friend was good to me when I was ill. 我生病时我的朋友对我关怀备至。
3、be good for意为 “对??有好处”。
例如：Eating more vegetables is good for your health. 多吃蔬菜对你的健康有好处。
扩展资料
例子
1、In fact, they might be good for the economy.
事实上，它们可能还对美国经济产生了有益的推动。
2、I was thinking it would be good for bob.
我原来一直认为这对鲍勃有好处。
3、Rain water was once considered to be good for the complexion
雨水曾一度被认为可以滋养皮肤。
4、But if you have a good method of learning, I think you will be good at it.
但是如果你有好的学习方法，我想你就会学会它。
5、I independence, because I be good at association with person.
我独立，因为我善于与人交往。
参考资料：百度百科：good
2018-07-28 · 百度认证:北京新东方迅程网络科技股份有限公司官方账号
新东方在线网络课堂
举个例子：
I am good at English .
我擅长英语。
2）be good for意思是 “对……有好处”
举个例子：
Fruit is good for our health.
水果对我们的的健康有好处。
知识延伸：
be good 后接不同的介词，表达的意思同，除了be good at、be good for，常用的还有 be good with / be good to。
1、be good to对...态度好
例句：We should be good to the old.
2、be good with灵巧的；与……相处得好
例句：She is good with her hands.
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Be good at 擅长
Be good to 乐于助人的，好心的
Be good to do sth=Be good for sth 适合的，相宜的
