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  1. He is good at swimming.
  2. He is good in swimming.
  3. He is good for swimming.
  4. He is good with swimming.

What is the difference among 'good at' and ' in, with,for' in the sentence above in meaning?

  • good at/with/for but good in? I don't think so. Can anyone confirm this? – Alejandro Jul 6 '16 at 5:48
  • It's more idiomatic to say good at swimming than good in swimming. He is good for/with swimming seem to be odd. However, swimming is good for. you is idiomatic. – Khan Jul 6 '16 at 8:14
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I've primarily heard "good in" used to reference school classes.

  • "At" is generally used for activities (good at chess, good at drawing)
  • "In" is used for classes or jobs (good in math class, good in his role, good in his profession)
  • "With" is used for objects/things to show that the subject has skill with them (good with numbers, good with tools)
  • "For" would seem to implying how the doer is beneficial (answering the question: what is he good for?)

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