be good for对...有好处, 如:
Drinking lots of water is good for us.
喝大量的水对我们有好处。
be good with 和...处的好, 如:
She's always good with children.
她总是和孩子们处的好。
be good at 擅长... 如:
Jim is very good at sports.
吉姆很擅长运动
没有be good in这个结构
be good for 对……有好处;对……有作用
be good at 善于,擅长于
be good with 擅长
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