If our cat was a cow...

If our cat was a cow, we could milk her behind the stove.

It's the translation of a Flemish saying, and I wondered if there's an English equivalent (I could really use in a lesson I need to give next week) The meaning is something in the style of "After things happened, you could wish that they went differently, but that's all vain whining".

I would greatly appreciate any help you can offer.
Already great thanks

There are several here:
www.phrases.org.uk bulletin_board 5 messages 1558.html

www.phrases.org.uk bulletin_board 49 messages 1120.html

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