Do or play sports like swimming and karate?
In spanish we say I do sports and in english I play sports, I play soccer, I play basket ball, etc. but how can I say with sports like swimming or karate, (do or play?)

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That's a very good question. With karate you can say, "I practice karate" because it's a martial art, a discipline. With swimming you can say, "I swim." Just like that.

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For swimming we just say "I swim" or I "go swimming. For karate, we "practice karate" or "do karate"

Here's a good website to help you distinguish when to use each verb: http://www.englishteachermelanie.com/vocabulary-verbs-used-to-talk-about-sports-play-do-go/

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In English, it is "I swim" and "I do karate" (or "I practice karate"). I think, in general, that in English we only "play" team sports and not individual sports - so it's I jog, I walk, I swim, I ski (but not I play jogging, I play swimming, etc).