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J, 20 bytes

1&A.&.>@cut;@,.<@' '

Try it online!

###How it works

 cut Split on spaces
 &.>@ For each string
1&A. Swap the last two letters
 <@' ' A single space
 ;@,. Append to each and unbox

I wonder if it’s shorter to simply calculate the permutation for the entire input.