Question

be good at和be good in可以互换吗？

Answer 1

意思有所区别，不能换：
be good at擅长
you had to be good at math

be good in 在某方面出色，有效果
The method was proved to be good in reproducibility and of low detection limit.

Answer 2

不可以，be good at 可以用do well in互换

Answer 3

be good at擅长
you had to be good at math
be good in 在某方面出色，有效果
The method was proved to be good in reproducibility and of low detection limit.
两者意思不同，不可互换

Answer 4

不可以
Be good at 加Sth
Be good in 加doing Sth

追问

I'm good at English.=I'm good in learning English.这样可以吗？

Answer 5

be good at/with/to/for的用法

1）be good at 意为“擅长……”，后接名词、代词或ving形式。
I’m good at playing chess. 我擅长下象棋。
We should be good at learning from each other. 我们应该善于互相学习。
Girls are better at English than boys, but boys do better in Maths than girls.

2）be good with意为“灵巧的；与……相处得好”。
=get on well with

He is very good with the children. 他与这些孩子处得很好。
= He is getting on with the children.
She is good with her hands. 她手很巧。

3）be good /kind /nice to意为“对……好”。反义词 be harmful to, do harm to
My friend was good to me when I was ill. 我生病时我的朋友对我关怀备至。
Smoking is harmful to health. 吸烟有害健康。

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。

注：区分句型
It’s good for sb. to do sth.
It’s good of sb. to do sth.= It’s kind of sb. to do sth.

It's good for your health to drink more water.
It's good for your body to take more exercise.
It’s good of you to help me.= It’s kind of you to help me.