Hi, No, you need to say 'I can swim free-style'. However, more common would be 'I can do (the) free-style', or 'I know free-style'. 'The' is optional.
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CliveHI guys,
You're right, of course, Teacher Eric, the word has both meanings today, although I think 'the crawl' is predominant. I wonder why you never see anyone do the butterfly in a short freestyle race?
I'd say 'I can swim 1 km freestyle.' 'For' before 1 km. can be omitted.
Or 'I can swim freestyle for 1km.'
'Freestyle' c