Hi Mike,
They both mean the same thing.The first might be more formal.
In the first sentence you use "infinitive+koto+ga+dekimasen" whereas in the secon sentence you simply use the potencial form.
November 3, 2018
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Hi!
They're both used to express "can't swim". 泳げない is more formal than 泳ぐことができない。
Example: "I can't swim in the sea" --> 海で泳げない / 海で泳ぐことができない。
November 4, 2018
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