Preposition
Can I write' he is swimming at the river now.'? Instead of using' in the river'. Thanks.
2 answers 
I would use "in" because he is actually in the water. Being at the river could mean he is standing on the bank of the river. "At" could imply anywhere around the river as well as in it, so "in" would be clearer.
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answered May 09 '12 at 15:26
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I would support Mr. Courtney that "swim in" would be better to give a clear meaning.
At is used to point out specific location. e.g.
Where is Jack swiming? (pond/river)
He is swiming at the river.
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answered May 09 '12 at 15:34
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