It was a man who swam the river
To reduce the clause, can i change it into
It was a man swimming the river
?
[1] It was a man who swam the river . [relative clause] [2] It was a man swimming the river . [gerund-participial clause] I thought we'd already discussed the topic of clause reduction.
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[1] It was a man who swam the river. [relative clause]
[2] It was a man swimming the river. [gerund-participial clause]
I thought we'd already discussed the topic of clause reduction.
Switching the underlined clause in [1] to the one in [2] is not a matter of 'reducing' it, but that of replacing it with a different kind of clause. Moreove
1. It was a man who swam the river
2. It was a man swimming the river
As explained above by BillJ, these are both valid English, but with different meanings.
But instead of #1, you could say It was a man swam the river and retain the meaning.
Note that I wouldn't say this is common, everyday English.
Clive