be good at ; be good with; be good for 用法

1. be good at (doing) sth. 擅長于……

e.g. She is interested in painting and she is really good at painting animals. 她愛好畫畫，并擅長畫動物。

We are very good at math and we have fun learning it. 我們都擅長數學，學習數學很有樂趣。

2. be good with 善于應付……

She volunteers at the Old People's Home and she is good with the old people. 她在老年人之家當義工，她跟老人們相處很有一套。

3. be good for 對……有好處

Eating too much ice-cream is not good for our health. 冰淇淋吃得太多對我們身體不好。