1. be good at (doing) sth “擅长(做)某事”
如:I'm good at playing soccer.
2. be good to sb “对...友好”
如:You should be good to your friends.
3. 的确有be good to do sth,意思是“做某事很好/有好处”,不过这不是固定搭配。
如:It's good to get up early in the morning.
早上早起有好处/是好的。
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